TRANSPARANTES OPTICAL SWITCHING NETWORK

HIGH SPEED SWITCHING SYSTEM

OPTICAL TDM AND WDM SWITCHING NODE

Switching methods with a plurality of time intervals

Optical packet processing

Optical telecommunications network

TRANSPARENT OPTICAL SWITCH

A transparent optical switch includes network management and performance monitoring using bit level information obtained by extracting selected information on a polling basis and analyzing the extracted information in the electrical domain. In one embodiment, a signal is injected into the switch fabric of the switch via a demultiplexing device. The injected signal is extracted at the output of the switching fabric via an N:1 switch and analyzed by a signal analyzer to verify input to output connections. In another embodiment, an optical switch includes first and second switch fabrics for 1:2 broadcast capability. In a further embodiment, an optical communication system includes a plurality of optical networks and a plurality of optical switches that cooperate to generate unequipped signals and to obtain autonomously switch-to-switch port connectivity information required for auto-topology discovery.

SINGLE-ROTATOR CIRCULATING SWITCH

Switch elements, each receiving data from external sources and transmitting data to external sinks, are interconnected through a single rotator to form a switching node. The single rotator has a number of inlets equal to the number of switch elements and a number of outlets equal to the number of switch elements. A first set of channels connects the switch elements to inlets of the rotator and a second set of channels connects the outlets of the rotator to the switch elements. The connectivity pattern of the second set of channels is a transposition of the connectivity pattern of the first set of channels in order to preserve sequential data order of switched data. A controller communicatively coupled to the switch elements exchanges timing data with external nodes of a time-coherent network and schedules data transfer among the switch elements.

HIGH-CAPACITY PACKET-SWITCHED RING NETWORK

A packet-switched WDMA ring network has an architecture utilizing packet stacking and unstacking for enabling nodes to access the entire link capacity by transmitting and receiving packets on available wavelengths. Packets are added and dropped from the ring by optical switches. A flexible credit-based MAC protocol along with an admission algorithm enhance the network throughput capacity.

SYSTEM AND METHOD FOR PHOTONIC SWITCHING

In one embodiment, method of photonic packet switching includes receiving, by a photonic switching fabric from a first top-of-rack (TOR) switch, a destination port request corresponding to a first photonic packet and a first period of time, where the destination port request includes a first output port and determining whether the first output port is available during the first period of time. The method also includes receiving, by the photonic switching fabric from the first TOR switch, the first photonic packet and routing the first photonic packet to the first output port when the first output port is available during the first period of time. Additionally, the method includes routing the first photonic packet to an alternative output port when the first output port is not available.

OPTICAL DIGITAL TRANSMISSION FOR MULTIPLE BEAM CROSS CONNECTION, ROUTING AND SWITCHING

The invention concerns an optical digital transmitting device for cross connecting, routing and switching at temporal, spatial and frequency level a plurality of electromagnetic beams. Said device uses a plurality of laser type or other low/medium power type magnetic sources, coupled to a plurality of matrix optical heads and specific delay lines of the structured waveguide type based, for example, on optical fibers, of natural crystalline or specific synthetic structure, of optical passive/active memory structure, of any combination thereof. The electromagnetic multiple beam cross connection, routing and switching function whether of the optical type or not enables it to be used in various fields in telecommunications (such as point-to-point, point-to-multipoint free-space transmission).

Dynamic method of inserting data a the nodes of an optical transmission network

Dynamic method of adding data at the nodes of a fiber optic transmission network comprising at least one source node, one destination node and a plurality of intermediate nodes, the nodes being connected by a fiber optic connection. The method comprises the steps of creating at the source node an optical resource comprising portions containing data packets addressed to said destination node and free portions that may be occupied by packets supplied by each of said intermediate nodes, when said resource transits an intermediate node, detecting if said resource comprises free portions if said intermediate node has at least one data packet to transmit, and adding said data packet to a free portion of the frame if said free portion may contain said data packet.

Optical programmable delay system

This invention describes a system and a method for realizing an adjustable optical delay system that is based on using an optical switch. The outputs of the optical switch are connected to its inputs with optical fiber with predefined lengths: d1, d2, . . . , dj, . . . , dN, then changing the optical switch configuration forms an optical delay line with an optical fiber length that is the concatenation of any subset of the optical fibers with predefined lengths.

Distributed space-time-space switch

A wide-coverage, high-capacity, switching network is modeled after a classical space-time-space switch. In the switching network, each of the space stages comprises geographically distributed optical space switches and the time stage comprises a plurality of geographically distributed high-capacity electronic switching nodes. User-access concentrators, each supporting numerous users, access the network through ports of the distributed optical space switches. A user-access concentrator is a simple device which need only have a single access channel to access the network, although two or more access channels may be used. Such a user-access concentrator can communicate with a large number of other user-access concentrators by time-multiplexing the access channel.

Latent space switch using a single transposing rotator

A single transposing rotator successively connects a set of access ports to a set of memory devices and the set of memory devices to the set of access ports. A set of inlet selectors connecting to rotator inlets and a set of outlet selectors connecting to rotator outlets are coordinated to concurrently connect the access ports to the memory devices through the rotator, and concurrently connect the memory devices to the access ports. Each memory device connects to an inlet selector and a corresponding peer outlet selector. Multiple temporal multiplexers submit upstream control messages from the access ports to a multi-port master controller. Multiple temporal demultiplexers distribute downstream control messages sent from the master controller to the access ports. Alternatively, the multi-port master controller may connect to selected inlet selectors and corresponding peer outlet selectors for successively receiving upstream control messages and sending downstream control messages.

System and method for photonic switching

In one embodiment, a method of photonic frame scheduling includes receiving, by a photonic switching fabric from a top of rack (TOR) switch, a frame request requesting a time slot for switching an optical frame to an output port of a photonic switch of the photonic switching fabric and determining whether the output port of the photonic switch is available during the time slot, and generating a contention signal including a grant or a rejection, in accordance with the determining. Also, the method includes assigning the time slot to the TOR switch for the output port of the photonic switch, when the contention signal includes the grant, transmitting, by the photonic switching fabric to the TOR switch, the contention signal and receiving, by the photonic switching fabric from the TOR switch, the optical frame during the time slot, when the contention signal includes the grant.

All-optical time slice switching method and system based on time synchronization

An all-optical time slice switching method based on time synchronization is provided. With the method, continuous data streams in an optical network are assembled to time domain periodic optical time slices and are transmitted in an asynchronous transmission mode. Network nodes obtain high precision synchronization time via a network and control optical switches to switch arriving optical time slices to a target port at precise time points periodically, therefore all-optical switching is implemented. When a connection request arrives, an available path, a wavelength and time slots to be occupied are calculated by a source node according to information on available time slots of the optical network, and the time slots are reserved by a connection management module. After the time slots are reserved, the source node send optical time slices carrying services periodically at reserved time slots. A destination node restores the optical time slices to the data streams.

ОПТИЧЕСКАЯ ЦИФРОВАЯ ПЕРЕДАЧА ДЛЯ МНОГОЛУЧЕВОЙ КРОССИРОВКИ, МАРШРУТИЗАЦИИ И КОММУТАЦИИ

1. Цифровое оптическое передающее устройство (фиг.1), отличающееся тем, что включает определенное число оптических вращающихся дисков, выполненных с возможностью изменения расположения, по одной линии, в шахматном порядке, параллельно и иным образом в зависимости от области применения, разделенных по определенному числу вращений в одной и той же или разных плоскостях, каждый с индивидуальной скоростью вращения, каждый с индивидуальным расположением выступающих граней и/или резонаторов, вырезанных в устройстве с основанием или без него, с зеркалами и/или фильтрами или без них, с обеспечением определенного числа особых комбинаций отражений, передач, рефракций или дифракции, и выполненных с возможностью использования в обоих направлениях прохождения электромагнитного потока для достижения микширования /маршрутизации/ коммутации на временном, пространственном и частотном уровне определенного числа электромагнитных лучей, передающих данные или символы, лазерного или другого типа, по оптическому волокну или без такового, при очень высокой скорости, включая тип DWDM спектрального мультиплексирования по длине волны. ! 2. Устройство (фиг.2) и (фиг.3) по п.1, отличающееся тем, что включает оптические вращающиеся диски, имеющие одну или две рабочие стороны, при этом каждая из сторон имеет определенное число граней и/или резонаторов по п.1, распределенных с каждой стороны на определенное число дорожек, секторов, секций, квадрантов, где зеркала/фильтры расположены на поверхности или врезаны внутрь и являются съемными или несъемными, встроенными или накладными. ! 3. Устройство (фиг.3) и (фиг.4) по п.1, отличающееся тем, что включае РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2008 130 042 (13) A (51) МПК G02B 6/35 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ, ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21), (22) Заявка: 2008130042/28, 30.01.2007 (71) Заявитель(и): БРЕИЖТЕКХ САС (FR) (30) Конвенционный приоритет: 01.02.2006 FR 0600903 (43) Дата публикации заявки: ...

OPTISCHES ÜBERTRAGUNGSNETZ

OPTICAL TDM COMMUNICATION SYSTEM

ARCHITECTURE, PROCEDURE AND SYSTEM OF WDM SUPPORTING PHOTONI BURST CONCILIATORY NETWORKS

OPTICAL MULTI-LEAP COMMUNICATIONS NETWORK

PROCEDURE FOR THE DYNAMIC DATA IN-ADDING IN OPTICAL TRANSMISSION NETWORK WORK KNOTS

SPECTRAL-TEMPORAL CONNECTOR FOR FULL-MESH NETWORKING

A spectral-temporal connector interconnects a large number of nodes in a full-mesh structure. Each node connects to the spectral-temporal connector through a dual link. Signals occupying multiple spectral bands carried by a link from a node are de-multiplexed into separate spectral bands individually directed to different connector modules. Each connector module has a set temporal rotators and a set of spectral multiplexers. A temporal rotator cyclically distributes segments of each signal at each inlet of the rotator to each outlet of the rotator. Each spectral multiplexer combines signals occupying different spectral bands at outlets of the set of temporal rotators onto a respective output link. Several arrangements for time-aligning all the nodes to the connector modules are disclosed.

MPLS APPLICATION TO OPTICAL CROSS CONNECT USING WAVELENGTH AS A LABEL

A label switching routing protocol for establishing a datapath as a sequence of locally unique labels in an optical communications network, is provided. A wavelength on an optical cross-connect is considered as a label or one portion of a label. Timeslots may be assigned to designated wavelengths so as to form the second portion of the label. An optical time cross-connect (OTXC) capable of wavelength conversion from an input to an output interface creates the datapath based on wavelength to wavelength substitution, under the control of a multi-protocol label switching (MPLS) protocol.

MPLS APPLICATION TO OPTICAL CROSS CONNECT USING WAVELENGTH AS A LABEL

A label switching routing protocol for establishing a datapath as a sequence of locally unique labels in an optical communications network, is provided. A wavelength on an optical cross-connect is considered as a label or one portion of a label. Timeslots may be assigned to designated wavelengths so as to form the second portion of the label. An optical time cross-connect (OTXC) capable of wavelength conversion from an input to an output interface creates the datapath based on wavelength to wavelength substitution, under the control of a multi-protocol label switching (MPLS) protocol.

DELAY LINE OPTICAL SELECTIVE IN WAVELENGTH

L'invention propose une ligne à retard sélective en longueur d'onde, comprenant des moyens pour retarder la propagation d'un signal optique se propageant dans une structure guidante G, par l'augmentation de la longueur du chemin optique parcouru par ledit signal, comprenant des moyens d'insertion et d'extraction d'un signal optique d'une longueur d'onde donnée lambdaB , à des fins de multiplexage en longueurs d'onde, ladite ligne à retard ayant la topologie d'une boucle optique g d'une longueur donnée qui impose un retard fixe tau pour un signal optique qui doit parcourir ladite boucle g, lesdits moyens d'insertion et d'extraction pour le multiplexage en longueurs d'onde étant connectés à ladite boucle optique g de manière à effectuer l'extraction dudit signal optique à ladite longueur d'onde lambdaB de ladite structure guidante G, le routage dudit signal optique dans ladite boucle optique g, et la réinsertion dudit signal optique dans ladite structure guidante G après ledit retard fixe tau. Selon une réalisation préférée, lesdits moyens d'insertion et d'extraction d'un signal optique d'une longueur d'onde donnée lambdaB comprennent un coupleur optique C et un réseau de Bragg B. Selon une variante, ledit réseau de Bragg B est disposé dans la région de couplage dudit coupleur optique C. Applications dans des systèmes de télécommunications optique à multiplexage en longueur d'onde. The invention proposes a wavelength-selective delay line, comprising means for delaying the propagation of an optical signal propagating in a guiding structure G, by increasing the length of the optical path traveled by said signal, comprising means for inserting and extracting an optical signal of a given wavelength lambdaB, for wavelength multiplexing purposes, said delay line having the topology of an optical loop g d 'a given length which imposes a fixed delay tau for an optical signal which ...

Single-rotator latent space switch with an external controller

A latent space switch based on a single rotator and an array of memory devices is disclosed. The switch interfaces with external nodes through a set of access ports. The rotator has a set of inlets and a set of outlets with each inlet connecting to each outlet during a time frame organized into time slots. During each time slot, an inlet alternately connects to an access port and a memory device while a transposed outlet of the inlet alternately connects to the same memory device and another access port. Multiple temporal multiplexers submit upstream control messages from the access ports to a multi-port master controller. Multiple temporal demultiplexers distribute downstream control messages sent from the master controller to the access ports.

Latent Space Switch using a Single Transposing Rotator

A single transposing rotator successively connects a set of access ports to a set of memory devices and the set of memory devices to the set of access ports. A set of inlet selectors connecting to rotator inlets and a set of outlet selectors connecting to rotator outlets are coordinated to concurrently connect the access ports to the memory devices through the rotator, and concurrently connect the memory devices to the access ports. Each memory device connects to an inlet selector and a corresponding peer outlet selector. Multiple temporal multiplexers submit upstream control messages from the access ports to a multi-port master controller. Multiple temporal demultiplexers distribute downstream control messages sent from the master controller to the access ports. Alternatively, the multi-port master controller may connect to selected inlet selectors and corresponding peer outlet selectors for successively receiving upstream control messages and sending downstream control messages.

Time-coherent global network employing spectral routers

A network of global coverage, scalable to an access capacity of hundreds of petabits per second, is configured as independent bufferless switches with spectral routers connecting edge nodes to the switches. The switches are logically arranged in at least one matrix, the spectral routers are logically arranged into a matrix of upstream spectral routers and a matrix of downstream spectral routers. Each edge node has a link to an upstream spectral router in each column of the matrix of upstream spectral routers and a link from a downstream spectral router in each row of the matrix of downstream spectral routers. Preferably, all sets of edge nodes connecting to the upstream spectral routers are selected to be mutually orthogonal. Each switch is coupled to a respective switch controller and a respective time indicator. Each switch controller entrains time indicators of a set of subtending edge nodes to enable coherent switching.

Optical ring network with void filling protocol independent of the transmission rate

Optical signal packet transmission method for e.g. metropolitan wavelength division multiplexing network, involves sending synchronization signals to two stations, and authorizing each station to insert pending packet in fiber The method involves sending synchronization signals representative of a flow of transmission sessions of chosen period to two communication stations (4-i). Each station is authorized during each session to insert a pending packet in an optical fiber (2) according to a wavelength. The insertion starts after a time interval, counted from end of transit of an initial packet, which is less than a threshold period. - An INDEPENDENT CLAIM is also included for a ring optical network comprising two communication stations.

COMMUNICATIONS NETWORK

A communications network, suitable, for example, for linking computer processors, is formed from a number of nodes and links. The nodes and links are configured as a multiplicity of directed trails. Each directed trail spans some only of the nodes, but in combination the directed trails span every node of the network. Packets are routed through the network by selecting the appropriate one of the directed trails which links the source node and destination node, and by outputting the packet at the source node onto the selected trail. The nodes throughout the network may switch between predetermined and prescheduled switching states, and a given trail may be selected by choosing appropriately the time slot in which the packet is put onto the network. The network may be a photonic network carrying optical packets.

СПОСОБ ОБРАБОТКИ ДАННЫХ, ПЛАТА СВЯЗИ И УСТРОЙСТВО

FIELD: communication. SUBSTANCE: invention relates to communication technologies. For this, method includes: reception, by means of first communication board of data stream units of ODU optical channel data; performing, by first communication board, slicing processing over ODU data stream according to frames fixed frequency in order to obtain various slices, wherein each slice includes segment of continuous ODU data in ODU data stream; separate inclusion, by means of first communication board, of each slice into Ethernet frame; and sending, by means of first communication board, of each Ethernet frame to TDM multiplexing service switching module with time division in Ethernet switching microchip so, that TDM service switching module sends each Ethernet frame to second communication board, to which directs MAC destination address, portable in Ethernet frame. EFFECT: technical result is reduction of TDM service transmission delay. 20 cl, 8 dwg, 2 tbl РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 606 060 C1 (51) МПК H04L 12/64 (2006.01) H04L 12/939 (2013.01) H04Q 11/04 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ФОРМУЛА (21)(22) Заявка: ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ 2015126794, 05.12.2012 (24) Дата начала отсчета срока действия патента: 05.12.2012 Дата регистрации: (72) Автор(ы): СЯО Синьхуа (CN), ЧЭНЬ Юйцзе (CN), ТАН Цзинсинь (CN) Приоритет(ы): (22) Дата подачи заявки: 05.12.2012 (56) Список документов, цитированных в отчете о поиске: RU 2465732 C2, 27.10.2012. CN (45) Опубликовано: 10.01.2017 Бюл. № 1 (86) Заявка PCT: CN 2012/085963 (05.12.2012) (87) Публикация заявки PCT: Адрес для переписки: 129090, Москва, ул. Б. Спасская, 25, стр. 3, ООО "Юридическая фирма Городисский и Партнеры" 2 6 0 6 0 6 0 (54) СПОСОБ ОБРАБОТКИ ДАННЫХ, ПЛАТА СВЯЗИ И УСТРОЙСТВО (57) Формула изобретения 1. Способ обработки данных, применяемый в устройстве коммутации данных, содержащем первую плату связи, вторую плату связи и модуль коммутации услуги ...

Optical telecommunications network

DISTRIBUTED SPACE-TIME-SPACE SWITCH

A wide-coverage, high-capacity, switching network is modeled after a classical space-time-space switch. In the switching network, each of the space stages comprises geographically distributed optical space switches and the time stage comprises a plurality of geographically distributed high-capacity electronic switching nodes. User-access concentrators, each supporting numerous users, access the network through ports of the distributed optical space switches. A user-access concentrator is a simple device which need only have a single access channel to access the network, although two or more access channels may be used. Such a user-access concentrator can communicate with a large number of other user-access concentrators by time-multiplexing the access channel.

METHOD, TOPOLOGY AND POINT OF PRESENCE EQUIPMENT FOR SERVING A PLURALITY OF USERS VIA A MULTIPLEX MODULE

A number of users interface with a network via a multiplex module, on a communication path established between the multiplex module and a point of presence. Some users may be served by one or more first channels of the communication path while one or more remaining users may be served by one or more additional channels of the communication path. Users having a basic service level agreement may be served by the first channels while users having an extended service level agreement may be served by the one or more additional channels. Allocation of users to distinct channel types based on their service level agreements may apply at a primary point of presence or may apply at a redundant point of presence.

OPTICAL SPECTRAL-TEMPORAL CONNECTOR

An optical spectral-temporal connector, having multiple connector modules, interconnects a large number of nodes in a full-mesh structure. A wavelength-division-multiplexed link from each node is de-multiplexed into wavelength channels individually directed to different connector modules. Each connector module has a set of star couplers, each star coupler connecting to wavelength channels from a respective set of nodes through spectral translators. Each spectral translator cyclically shifts a spectral band of a wavelength channel so that, at any instant of time, spectral bands of signals at inlets of any star coupler are disjoint. A spectral router connects outlets of the set of star couplers to a respective set of nodes. A spectral-translation controller prompts each spectral translator to shift to a new spectral band. Several arrangements for time-aligning all the nodes to the connector modules are disclosed.

OPTICAL DIGITAL TRANSMISSION FOR MULTIPLE BEAM CROSS CONNECTION, ROUTING AND SWITCHING

L'invention concerne un dispositif de transmission numérique optique qui permet le brassage, le routage et la commutation au niveau temporel, spatial et fréquentiel d'un certain nombre de faisceaux électromagnétiques. Ce dispositif utilise un certain nombre de sources électromagnétiques de type laser ou autre de faible/moyenne puissance, couplés à un certain nombre de têtes matricielles optiques et de lignes à retard spécifiques de type guide d'onde structuré à base, p.ex. de fibres optiques, de structure cristalline naturelle ou de synthèse spécifique, de mémoire passive/active optique, ou de toute combinaison de ces derniers. La fonction de brassage, routage et commutation multifaisceaux électromagnétiques de type optique ou non en autorise l'utilisation dans différents domaines d'applications en télécommunication (p.ex. transmission point à point, point à multipoints, en espace libre). The invention relates to an optical digital transmission device which allows the mixing, routing and switching at the temporal, spatial level and frequency of a number of electromagnetic beams. This device uses a number of electromagnetic sources of type laser or other low / medium power, coupled with a number of optical matrix heads and specific guide type delay lines structured wave pattern, eg of optical fibers, of crystalline structure specific synthesis or synthesis, optical passive / active memory, or any combination of these. The function of mixing, routing and electromagnetic multibeam switching of optical or non-optical type allows the use in different areas of applications in telecommunication (eg point-to-point, point-to-multipoint transmission, free space).

OPTICAL PACKET PROCESSING

A multi-bit packet carried on an optical network includes a marker pulse. A bit-rate clock for use in a bit-level operation on the packet is generated by replicating the marker pulse. The bit-level operation may comprise retiming, regeneration or demultiplexing. The marker pulse may be distinguished by a fixed, bit-asynchronous time relationship to the rest of the packet.

MULTISERVICE OPTICAL SWITCH

A method and apparatus for building a multiservice switch using a time-slotted optical switch fabric are disclosed. Service-specific line cards transfer blocks of information across the optical switch by transmitting fixed-duration bursts of optical signals. A modular method is disclosed for expanding the number of cards that can be supported by a time-slotted N input by N output optical switch. Apparatus and methods for building said optical switches using electrooptic wafer beam deflector components are disclosed. SONET, ATM, and packet transfer services are supported by the service specific line cards.

PROCESS AND DEVICE OF MANAGEMENT OF PACKAGES HAVE MULTIPLEXING HAS REPARTITIONTEMPORELLE AND DISTRIBUTION OVER WAVELENGTHS FOR OPTICAL NETWORKS

MODULATE SELECTION FOR SWITCH OF OPTICAL SIGNALS AND SWITCH OF OPTICAL SIGNALS

La présente invention concerne un module de sélection Mk pour commutateur de signaux optiques. Ce module de sélection Mk pour commutateur de signaux optiques comporte un sélecteur spatial SE1 comprenant une pluralité d'entrées recevant chacune un signal optique multiplexé en longueur d'onde comportant une pluralité de canaux associés chacun à une longueur d'onde et une sortie recevant un signal sélectionné parmi ladite pluralité de signaux multiplexés en longueur d'onde. Le module Mk comporte également une pluralité de sélecteurs spectraux SE21,..., SE2k, chacun desdits sélecteurs spectraux réalisant la sélection d'un canal différent parmi la pluralité de canaux dudit signal sélectionné par ledit sélecteur spatial SE1.

AN OPTICAL COMMUNICATION NETWORK

An optical interconnection network has a plurality of network nodes (70) interconnected by optical links (76-79). The network nodes (70) each receive a global clock and switch repeatedly with a fixed periodicity their routing states according to the global clock. Each network node (70) selects a time slot, a wavelength, and an initial optical link for transmitting a packet in dependence upon the desired path for the packet through the network, and outputs the packet in the selected time slot, wavelength and link. The network topology is a torus of the Manhattan street type. Each network node (70) comprises a plurality of channel nodes (73 a) for each link, a wavelength division demultiplexer (72a), a combiner (74a), and an optical space switch (75). The optical space switch (75) has a 2x2 configuration. The optical space switch (75) has a wavelength converter (42) per link feeding a passive wavelength routing device (41).

IMPROVEMENTS IN OR RELATING TO COMMUNICATION SYSTEMS

A communication system for the mutual interconnection of a plurality of lower traffic level (5 Terabit) switch nodes via a relatively higher traffic level (Petabit) connection bus, which system comprises in operative association with each node, a two part TDM optical data management interface, wherein a first of the two parts comprises a time slot resequencer which serves to provide for the transmission of data from its associated node to the bus, and wherein a second of the two parts comprises a time slot specific combiner which serves for the transmission of data from the bus to its associated node, each node and the bus having independent data scheduling.

MULTI-HOP OPTICAL COMMUNICATION NETWORK

An apparatus includes a time-domain wavelength-interleaved optical network that connects a plurality of edge nodes. Each of the edge nodes is configured to receive optical communications from others of the edge nodes on an associated wavelength-channel. The number of edge nodes is larger than the number of the wavelength-channels.

COMMUNICATIONS NETWORK

A communications network, suitable, for example, for linking computer processors, is formed from a number of nodes and links. The nodes and links are configured as a multiplicity of directed trails. Each directed trail spans some only of the nodes, but in combination the directed trails span every node of the network. Packets are routed through the network by selecting the appropriate one of the directed trails which links the source node and destination node, and by outputting the packet at the source node onto the selected trail. The nodes throughout the network may switch between predetermined and prescheduled switching states, and a given trail may be selected by choosing appropriately the time slot in which the packet is put onto the network. The network may be a photonic network carrying optical packets.

Method for providing high connectivity communications over a packet-switched optical ring network using composite packets

A system for providing high connectivity communications over a packet-switched optical ring network comprises a core optical ring having at least one node, the node being coupled to a subtending system by an optical crossbar switch, a source for generating a set of packets, a stacker for forming a first composite packet from the set of serial packets, the stacker coupled to the optical crossbar switch, and the stacker further coupled to the source for generating the set of packets, the first composite packet being parallel packets in a single photonic time slot, the first composite packet to be added to the core optical ring in a vacant photonic time slot via the optical crossbar switch, a second composite packet propagating on the core optical ring destined to be dropped at the node for further distribution on the subtending system via the optical crossbar switch, an unstacker for serializing the second composite packet dropped at the node, the unstacker coupled to the optical crossbar ...

System and method for optical network

An optical circuit switching matrix includes a plurality of optical ports, each optical port being optically coupled to a respective one of a plurality of user nodes and an optical coupler having at least one input port optically coupled to the plurality of optical ports, and an output port. The optical circuit switching matrix also includes a wavelength demultiplexer having an input optically coupled to the output port of the optical coupler, and a plurality of output ports, each output port being optically coupled to a respective one of the plurality of optical ports.

Communications network

A communications network, suitable, for example, for linking computer processors, is formed from a number of nodes and links. The nodes and links are configured as a multiplicity of directed trails. Each directed trail spans some only of the nodes, but in combination the directed trails span every node of the network. Packets are routed through the network by selecting the appropriate one of the directed trails which links the source node and destination node, and by outputting the packet at the source node onto the selected trail. The nodes throughout the network may switch between predetermined and prescheduled switching states, and a given trail may be selected by choosing appropriately the time slot in which the packet is put onto the network. The network may be a photonic network carrying optical packets.

Non-blocking, scalable optical router architecture and method for routing optical traffic

A system and method for providing non-blocking routing of optical data through a telecommunications router that allows full utilization of available capacity. The router includes a number of data links that carry optical data packets to and from an optical router. The optical router includes a number of ingress edge units coupled to an optical switch core coupled further to a number of egress edge units. The ingress edge units receive the optical data packets from the data links and aggregate the optical data packets into "super packets" where each super packet is to be routed to a particular destination egress edge unit. The super packets are sent from the ingress edge units to an optical switch fabric within the optical switch core that routes each super packet through the optical switch fabric to the super packet's particular destination egress edge unit in a non-blocking manner (i.e., without contention or data loss through the optical switch fabric). This routing is managed by a core ...

Discrete time sequence model for slotted and synchronous switching of optical burst signals

A network (4) includes optical routers (19), which route information in fibers (10). Each fiber carries a plurality of data channels (16), carrying data in data bursts (28) and a control channel, carrying control information in burst header packets (32). A burst header packet includes routing information for an associated data burst (28) and precedes its associated data burst. Information on the data channels and control channel is organized in synchronized slots. Multiple burst header packets occupy portions of a slot, referred to as micro-slots. When the burst header packets are received, an egress processor (52) schedules the routing of their associated bursts. The egress processor (52) determines a time at which a data burst can be scheduled for passing through an optical matrix (40) to the desired output channel group (the burst can be delayed via fiber delay lines (46) if necessary).

Control plane for an optical network for transmitting multi-carrier data bursts with dynamic adaptation of learning sequence

A system for sending data in an optical network comprising a plurality of source nodes and destination nodes is disclosed. In one aspect, a source node generates, in a spectral band that is associated with it, a multi-carrier optical data signal obtained by modulation of a source signal at a source wavelength and sends it in the form of single-band data bursts that can be associated with distinct source wavelengths. A single-band data burst comprises, in addition to payload data symbols (PL), a sequence of learning symbols (TS) composed of a plurality of learning symbols. A control unit belonging to the control plane of the optical network determines, for at least one of the source nodes, instants of sending of the single-band data bursts and source wavelengths to be used for sending these single-band data bursts, as a function of a path time of the data bursts between the source node and one of the destination nodes associated with the source wavelength. The control unit also determines ...

A MULTISERVICE OPTICAL SWITCH

A time division multiplexed optical switching system switches a signal from an ingress port to an egress port. The system comprises an optical switching fabric, ingress and egress line cards and a switch control fabric. The optical switching fabric routes an optical signal from one of M ingress fibers to one of N egress fibers. The ingress line card is coupled between the ingress port and the optical switching fabric for receiving the signal at the ingress port. The ingress line card comprises a buffer for storing the ingress signal and transmits the signal to the optical switching fabric. The egress line card is coupled between the egress port and the optical switching fabric for receiving the optical signal from the egress fiber of the optical switching fabric. The egress line card comprises a buffer for storing the optical signal and transmits the signal to the egress port. The switch control fabric allots time slots to the ingress line card for transmitting to the optical switching ...

Time multiplexed space switch which translates a single wavelength data pulse sequence into a sequence of multi-wavelength pulses

The present invention provides, or finds application in, an optical time multiplexed space switch. Central to the invention is the idea of "translating" an input data pulse sequence 40 into a multi-wavelength pulse sequence and steering the resulting pulse sequence through wavelength selective structures such as demultiplexers 44 and multiplexers 48. In some embodiments time-slot interchanging is provided by passing demultiplexed components of the translated pulse sequence through delay lines of different lengths 46. In an alternative embodiment (Fig. 5) the invention is applied in a tributary space switch with multiple data inputs and multiple data outputs. In this case the pulses applied to a particular input are distributed across a plurality of outputs and each output contains pulses which originated from a plurality of different inputs. Another embodiment uses cyclic wavelength routing of arrayed waveguide gratings. The multi-wavelength pulse sequence may be generated by passing the ...

OPTICAL LOOP NETWORK WORK WITH LÖCHERFÜLLUNGSPROTOKOL INDEPENDENTLY OF THE DATA TRANSMISSION RATE

Optical telecommunications network

A multiservice optical switch

Optical cdma communications system using otdl device

MODULAR HIGH-CAPACITY SWITCH

A modular optical switch includes a set of optical switch modules connected in a mesh, a master controller for the whole optical node and a switch-module controller for each of the optical switch modules. The optical switch modules receive optical signals from, and transmit optical signals to, edge nodes based on connection requests received from the edge nodes. The master controller acts to select a path, using a simple or compound time-slot matching process, through the mesh of switch modules for each optical signal related to a connection request. Advantageously, the optical switch modules are fast switching, enabling the use of time-sharing schemes such as TDM, and the modular optical core node is made practical by efficient path selection at the master controller. A hybrid modular switch may include both optical and electronic switch modules, a master controller, and a switch-module controller for each of the switch modules.

IMPROVEMENTS IN OR RELATING TO COMMUNICATION SYSTEMS

A communication system for the mutual interconnection of a plurality of lower traffic level (5 Terabit) switch nodes via a relatively higher traffic level (Petabit) connection bus, which system comprises in operative association with each node, a two part TDM optical data management interface, wherein a first of the two parts comprises a time slot resequencer which serves to provide for the transmission of data from its associated node to the bus, and wherein a second of the two parts comprises a time slot specific combiner which serves for the transmission of data from the bus to its associated node, each node and the bus having independent data scheduling.

HIGH-CAPACITY PACKET-SWITCHED RING NETWORK

A packet-switched WDMA ring network has an architecture utilizing packet stacking and unstacking for enabling nodes to access the entire link capacity by transmitting and receiving packets on available wavelengths. Packets are added and dropped from the ring by optical switches. A flexible credit-based MAC protocol along with an admission algorithm enhance the network throughput capacity.

OPTICAL SWITCHING APPARATUS AND METHODS

An optical switching apparatus in an optical communication network selectively combines and separates series of optical signal samples using OTDM and/or WDM. In upstream communication, the optical switching apparatus optically converts n series of upstream optical signal samples having the upstream optical signal samples carried over channel wavelengths .lambda.1,...,.lambda.n at data rates DR1,...,DR n respectively into a combined series of upstream optical signal samples having the upstream optical signal samples carried over a channel wavelength .lambda.D at a combined data rate DR c which is greater than any one of the data rates DR1,...,DR n. The combined series of upstream optical signal samples is then routed to a destination route. In downstream communication, the optical switching apparatus optically converts a series of downstream optical signal samples carried over a channel wavelength .lambda.T at a data rate DR T into nn series of downstream optical signal samples having the ...

METHOD, TOPOLOGY AND POINT OF PRESENCE EQUIPMENT FOR SERVING A PLURALITY OF USERS VIA A MULTIPLEX MODULE

A number of users interface with a network via a multiplex module, on a communication path established between the multiplex module and a point of presence. Some users may be served by one or more first channels of the communication path while one or more remaining users may be served by one or more additional channels of the communication path. Users having a basic service level agreement may be served by the first channels while users having an extended service level agreement may be served by the one or more additional channels. Allocation of users to distinct channel types based on their service level agreements may apply at a primary point of presence or may apply at a redundant point of presence.

METHOD, TOPOLOGY AND POINT OF PRESENCE EQUIPMENT FOR SERVING A PLURALITY OF USERS VIA A MULTIPLEX MODULE

... ²A number of users interface with a network via a multiplex module, on a ²communication path ²established between the multiplex module and a point of presence. Some users ²may be served ²by one or more first channels of the communication path while one or more ²remaining users ²may be served by one or more additional channels of the communication path. ²Users having a ²basic service level agreement may be served by the first channels while users ²having an ²extended service level agreement may be served by the one or more additional ²channels. ²Allocation of users to distinct channel types based on their service level ²agreements may ²apply at a primary point of presence or may apply at a redundant point of ²presence.² ...

HIGH CAPACITY OPTICAL NODE

An optical core node that includes optical switching planes interfaces, at input, with multi-channel input links and, at output, with multi-channel output links. The number of channels per link can differ significantly among the links, necessitating that the input (output) links have different connection patterns to the switching planes. Such an optical core node requires new methods of assigning an incoming wavelength channel to one of the optical switching planes. The assignment of the channels of input and output links to input and output ports is established in a manner that increases input-output connectivity and, hence, throughput. Additionally, the networks that may be formed with such optical core nodes require new routing methods. A preferred method of selecting a path through the core node favors switching planes connecting to a small number of links. In a time-division-multiplexing (TDM) mode, the method of path selection is complemented by temporal packing of TDM frames.

A MODULAR, EXPANDABLE AND RECONFIGURABLE OPTICAL SWITCH

A method and apparatus is disclosed for a modular and expandable optical switch that transfers optical signals arriving at a multiplicity of input ports to distinct output ports. A basic switching unit is disclosed that transfers n input optical signals to n distinct output signals under the control of digital electronic signals. Apparatus and metho ds are disclosed for building said n by n basic switching units using electrooptic wafer beam deflectors. Methods are disclosed for building larger N input by N output optical switches by interconnecting and controlling arrays of basic switching units. Finally, methods are disclosed for building even larger optical switches by using wavelength- division multiplexing and demultiplexing at the input and output ports of an N x N optical switch.

Optical network switching nodes, optical burst synchronization method and circuit frame of multi-frame cluster

Architecture, method and system of WDM-based photonic burst switched networks

The architecture, system and operation of intelligent photonic burst switched (PBS) network consist of edge nodes and switching nodes. The PBS edge node includes a flow classifier, flow manager, and ingress/egress PBS MAC layer components. The flow classifier classifies information received from outside the PBS network into forward-equivalent classes. The flow manager determines whether the information is to be sent over the PBS network or some other destination supported by the PBS edge node. Information to be sent over the PBS network is processed by the ingress PBS MAC layer component, which assembles the information into data bursts, schedules the transmission of the data burst, builds a control burst, and frames the data and control bursts; which are to be optically transmitted over the PBS network. The egress PBS MAC layer component receives control bursts and the corresponding data bursts, de-frames the data bursts, and appropriately assembles the data. The data is then classified ...

AUTOMATED ACCESS NETWORK CROSS-CONNECT SYSTEM

An automated cross connect system (300) comprises a plurality of upstream (310-316) and downstream (340-348) line interface circuits for connection to upstream (308) and downstream (350-358) communication links. The upstream and downstream circuits (310-316 and 340-348) are interconnected with an automated cross connect switch (328) which selectively couples the upstream and downstream links in response to routing commands sent from a command center (360). The automated cross connect switch can be implemented as either a space or time multiplexing.

NON-BLOCKING, SCALABLE OPTICAL ROUTER ARCHITECTURE AND METHOD FOR ROUTING OPTICAL TRAFFIC

A system and method for providing non-blocking routing of optical data through a telecommunications router that allows full utilization of available capacity. The router includes a number of data links (20) that carry optical data packets to and from an optical router (50). The optical router (50) includes a number of ingress edge units (60) coupled to an optical switch core (30) coupled further to a number of egress edge units (160). The ingress edge units (60) receive the optical data packets from the data links (20) and aggregate the optical data packets into "super packets" where each super packet is to be routed to a particular destination egress edge unit (160). The super packets are sent from the ingress edge units (60) to an optical switch fabric (70) within the optical switch core (30) that routes each super packet through the optical switch fabric (70) to the super packet's particular destination egress edge unit (160) in a non-blocking manner (i.e., without contention or data ...

TRANSPARENT OPTICAL SWITCH

A transparent optical switch includes network management and performance monitoring using bit level information obtained by extracting selected information on a polling basis and analyzing the extracted information in the electrical domain. In one embodiment, a signal is injected into the switch fabric of the switch via a demultiplexing device. The injected signal is extracted at the output of the switching fabric via an N:1 switch and analyzed by a signal analyzer to verify input to output connections. In another embodiment, an optical switch includes first and second switch fabrics for 1:2 broadcast capability. In a further embodiment, an optical communication system includes a plurality of optical networks and a plurality of optical switches that cooperate to generate unequipped signals and to obtain autonomously switch-to-switch port connectivity information required for auto-topology discovery.

METHOD AND TIME-DIVISION MULTIPLEXING/DEMULTIPLEXING UNIT FOR DATA TRANSMISSION USING TIME-DIVISION MULTIPLEXING, PARTICULARLY FOR BANDWIDTH-OPTIMIZED DATA TRANSMISSION OF IP TRAFFIC WITH BROADCAST AND MULTICAST COMPONENTS IN A WDM SYSTEM

The invention relates to a method for data transmission using time-division multiplexing for data transmission of IP traffic with broadcast and multicast components in a WDM system, where a first network node in a transport network is supplied with a plurality of unicast data streams and at least one broadcast data stream, whose broadcast data are associated with a plurality of or all ports, for transmission in a downstream direction from the first network node to a second network node in the transport network, where the broadcast data and the unicast data are combined at the first network node to form one or more physical time-division multiplex data streams, where each physical time-division multiplex data stream corresponds to a time-division multiplex data signal with a predetermined carrier wavelength, and where the one or the plurality of time-division multiplex data signals are injected at the first network node into the transport network and are transmitted to a second network node ...

Optical switching apparatus and methods

An optical switching apparatus in an optical communication network selectively combines and separates, using OTDM and/or WDM, optical signal samples that are obtained by a spread spectrum technique or a combination of optical signal samples that are obtained by a spread spectrum technique and optical signal samples that are carried over discrete channel wavelengths. In upstream communication, when optical signal samples that are received at the optical switching apparatus include upstream optical signal samples that are obtained by a spread spectrum technique, the optical switching apparatus optically converts the optical signal samples provided thereto into a broadband combined series of upstream optical signal samples and routes the broadband combined series of upstream optical signal samples to a destination route. In downstream communication, when the optical switching apparatus receives a broadband series of downstream optical signal samples obtained by utilizing a spread spectrum technique, the optical switching apparatus optically converts the broadband series of downstream optical signal samples into an integer number nn>1 of series of downstream optical signal samples that include at least one of the following: broadband series of downstream optical signal samples; and series of downstream optical signal samples having the downstream optical signal samples carried over discrete channel wavelengths. The nn series of downstream optical signal samples are then routed to nn routes respectively. Related apparatus and methods are also described.

Transparent optical switch

A transparent optical switch includes network management and performance monitoring using bit level information obtained by extracting selected information on a polling basis and analyzing the extracted information in the electrical domain. In one embodiment, a signal is injected into the switch fabric of the switch via a demultiplexing device. The injected signal is extracted at the output of the switching fabric via an N:1 switch and analyzed by a signal analyzer to verify input to output connections. In another embodiment, an optical switch includes first and second switch fabrics for 1:2 broadcast capability. In a further embodiment, an optical communication system includes a plurality of optical networks and a plurality of optical switches that cooperate to generate unequipped signals and to obtain autonomously switch-to-switch port connectivity information required for auto-topology discovery.

CONTROLLING TIME DIVISION DUPLEX OPERATION

A central node for digital subscriber line access multiplex. The central node supports a plurality of subscriber devices and comprises: a digital interface for upstream communication; a converter device for each one of the subscriber devices wherein each converter device comprises an A/D, analogue to digital, converter and a D/A, digital to analogue, converter; an analogue optical interface for communication of analogue signals for all of the subscriber devices with an intermediate distribution node for digital subscriber line access multiplex; a digital multiplexer/demultiplexer connected between the digital interface and the plurality converter devices; an analogue multiplexer/demultiplexer connected between the analogue optical interface and the plurality of converter devices; and a control signal generator connected to the analogue multiplexer/demultiplexer, wherein the control signal generator is arranged to generate an analogue control signal for controlling time division duplex operation at the intermediate distribution node. 1. A central node for digital subscriber line access multiplex , the central node supporting a plurality of subscriber devices and comprising:a digital interface for upstream communication;a converter device for each one of the subscriber devices wherein each converter device comprises an analogue to digital (A/D) converter and a digital to analogue (D/A) converter;an analogue optical interface for communication of analogue signals for all of the subscriber devices with an intermediate distribution node for digital subscriber line access multiplex;a digital multiplexer/demultiplexer connected between the digital interface and the plurality converter devices;an analogue multiplexer/demultiplexer connected between the analogue optical interface and the plurality of converter devices; anda control signal generator connected to the analogue multiplexer/demultiplexer, wherein the control signal generator is arranged to generate an analogue ...

Time driven tunable laser based switching with common time reference

A time frame switching method and system of data units that utilize a global common time reference, which is divided into a plurality of contiguous periodic time frames. The system is designed to operate with high-speed wavelength division multiplexing (WDM) links, i.e., with multiple lambdas. The plurality of data units that are contained in each of the time frames are forwarded in a pipelined manner through the network switches, wherein at every stage of the pipeline is tuned to a new wavelength by using a tunable laser. Furthermore, the incoming wavelength of a time frame determines to which output port the data units in this time frame will be switched, while the new wavelength determines to which output the data units in this time frame will be switched in the next switch on the route. The outcome of this switching method is called tunable laser based fractional lambda switching.

Method, topology and point of presence equipment for serving a plurality of users via a multiplex module

A number of users interface with a network via a multiplex module, on a communication path established between the multiplex module and a point of presence. Some users may be served by one or more first channels of the communication path while one or more remaining users may be served by one or more additional channels of the communication path. Users having a basic service level agreement may be served by the first channels while users having an extended service level agreement may be served by the one or more additional channels. Allocation of users to distinct channel types based on their service level agreements may apply at a primary point of presence or may apply at a redundant point of presence.

Hybrid fine-coarse carrier switching

An optical shell node is provided with an ability to perform time switching on signals received from subtending edge nodes and channel switching on signals received from other shell nodes and destined for the subtending edge nodes. The signals received from the subtending edge nodes may be aggregated into signals that are channel switched by optical core nodes or by other shell nodes toward destination edge nodes. A resultant network formed of these shell nodes along with channel-switching core nodes and subtending-upon-shell-node edge nodes is capable of expansion beyond a continental scale, can support large numbers of edge nodes and has a higher bit rate capacity than known optical network structures.

Modular high-capacity switch

A modular optical switch includes a set of optical switch modules connected in a mesh, a master controller for the whole optical node and a switch-module controller for each of the optical switch modules. The optical switch modules receive optical signals from, and transmit optical signals to, edge nodes based on connection requests received from the edge nodes. The master controller acts to select a path, using a simple or compound time-slot matching process, through the mesh of switch modules for each optical signal related to a connection request. Advantageously, the optical switch modules are fast switching, enabling the use of time-sharing schemes such as TDM, and the modular optical core node is made practical by efficient path selection at the master controller. A hybrid modular switch may include both optical and electronic switch modules, a master controller, and a switch-module controller for each of the switch modules.

High capacity optical node

An optical core node that includes optical switching planes interfaces, at input, with multi-channel input links and, at output, with multi-channel output links. The number of channels per link can differ significantly among the links, necessitating that the input (output) links have different connection patterns to the switching planes. Such an optical core node requires new methods of assigning an incoming wavelength channel to one of the optical switching planes. The assignment of the channels of input and output links to input and output ports is established in a manner that increases input-output connectivity and, hence, throughput. Additionally, the networks that may be formed with such optical core nodes require new routing methods. A preferred method of selecting a path through the core node favors switching planes connecting to a small number of links. In a time-division-multiplexing (TDM) mode, the method of path selection is complemented by temporal packing of TDM frames.

Optischer TDM und WDM Vermittlungsknoten

Netzwerk mit vemittelten Kanalbanden

Waveguide modulator structures

A Mach-Zehnder waveguide modulator comprising a left arm including a left SiGe optical waveguide, and a right arm including a right SiGe optical waveguide; wherein each of the left and right optical waveguides comprises a junction region and a plurality of electrodes for providing a bias across the junction to enable control of the phase of light travelling through the junction regions via dispersion.

HIGH-CAPACITY WDM-TDM PACKET SWITCH

A self-configuring distributed packet switch which operates in wavelength division multiplexed (WDM) and time division multiplexed (TDM) modes is described. The switch comprises a distributed distributed channel switch core, the core modules being respectively connected by a plurality of channels to a plurality of high-capacity packet switch edge modules. Each core module operates independently to schedule paths between edge modules, and reconfigures the paths in response to dynamic changes in data traffic loads reported by the edge modules. Reconfiguration timing between the packet switch modules and the channel switch core modules is performed to keep reconfiguration guard time minimized. The advantage is a high-capacity, load-adaptive, self-configuring switch that can be distributed to serve a large geographical area and can be scaled to hundreds of Tera bits per second to support applications that require very high bandwidth and a guaranteed quality of service.

TIME-SLOTTED OPTICAL SPACE SWITCH

A method and apparatus for the switching synchronised bursts of optical signals arriving at a multiplicity of input ports and destined to distinct output ports is disclosed. A basic switching unit is disclosed that transfers n input optical signals to n distinct output signals under the control of digital electronic signals. Apparatus and methods for building n by n basic switching units that can be reconfigured at high rates are disclosed. Methods are disclosed for building larger N input by N output optical switches by interconnecting and controlling arrays of basic switching units. Methods are disclosed for the allocation of transmission capacity across said optical switches.

METHOD, TOPOLOGY AND POINT OF PRESENCE EQUIPMENT FOR SERVING A PLURALITY OF USERS VIA A MULTIPLEX MODULE

TIME-COHERENT GLOBAL NETWORK

A network of global coverage, scalable to hundreds of petabits per second, comprises bufferless switch units each of dimension nxn, n > 1, arranged in a matrix of v columns and v rows, v > 1, interconnecting a maximum of vxn edge nodes. Each edge node has v upstream channels to v switch units in v different columns and v downstream channels from v switch units in v different rows. All upstream channels to a switch unit are time-locked to the switch unit, thus enabling coherent switching at the switch unit. The switch units are preferably fast-switching optical nodes. Alternatively, the switch units may comprise fast-switching optical nodes each of dimension mxm, arranged in a first µxµ matrix, and latent space switches each of dimension nxn, n > 1, arranged in a second vxv matrix, v > 1, where µxm=vxn. An edge node time locks to each optical node and each latent space switch to which it connects.

Service dispatching method, service dispatching device and service dispatching system of microwave link

The embodiment of the invention discloses a service dispatching method and a service dispatching device of a microwave link, which relate to the technical field of microwave communication and aim to solve the problem of non-uniform dispatch of time division multiplex (TDM) service and a packet service data unit in the prior art. The embodiment of the invention provides the service dispatching method of the microwave link, which comprises the following steps: receiving a microwave transmitting unit, the microwave transmitting unit carries at least one microwave data unit, and the microwave data units carry priority information; and dispatching the microwave data units according to the priority information of the microwave data units. The invention can realize the uniform dispatch of the TDM service and the packet service data unit.

OPTICAL NETWORK OUT OF RING HAS PROTOCOL OF INDEPENDENT FILLING OF HOLES DUDEBIT

PHOTONIC FRAME SWITCHING SYSTEM DETERMINING MOMENT OF TRANSMITTING PHOTONIC FRAME BASED ON TIME USED FOR CHANGING WAVELENGTH OF TUNABLE LASER DIODE

A photonic frame switching system may include a main controller and at least one photonic frame wrapper line card. The main controller may determine a point in time at which a photonic frame wrapper line card transmits a photonic frame by allocating a time slot to the photonic frame wrapper line card. When the photonic frame switching system includes a plurality of photonic frame wrapper line cards, points in times at which the plurality of photonic frame wrapper line cards transmits the photonic frames may be synchronized. In particular, when a portion of the plurality of photonic frame wrapper line cards transmit a plurality of photonic frames having different destinations, points in times at to which all of the plurality of photonic frame wrapper line cards transmits the photonic frames may be adjusted based on a latency by a destination change. 1. A photonic frame switching system comprising:a plurality of photonic frame wrapper line card each configured to generate a photonic frame by merging a plurality of packets based on a destination; anda main controller configured to transfer, to the plurality of photonic frame wrapper line cards, a scheduling acknowledgement (ACK) signal including information associated with a time slot that indicates a time at which the plurality of photonic frame wrapper line cards simultaneously transmits the photonic frames,wherein each of the plurality of photonic frame wrapper line cards is configured to to insert a preset guard time between a plurality of time slots corresponding to the plurality of photonic frames in response to transmitting a plurality of photonic frames having different destinations.2. The photonic frame switching system of claim 1 , wherein each of the plurality of photonic frame wrapper line cards comprises:a tunable laser diode configured to output the photonic frame using a wavelength corresponding to the destination; anda photonic frame wrapper apparatus configured to request the plurality of photonic ...

Optical switch using total internal reflection and a method of switching signals using the same

An optical switch is disclosed. The optical switch includes an optical signal transmitting electro-optic crystal having at least one first portion and at least one second portion. At least one of these portions is formed from a material which exhibits a change in index refraction upon the application of an electric field and the first and second portions define a switching interface therebetween. A signal source is provided for emitting a signal along an unguided beam path through the crystal, the unguided beam path intersecting the switching interface at an incident angle. An electric field generator is provided for generating an electrical field in at least one of the first and second portions of the crystal with the electrical field causing a change in an index of refraction for at least one of the first and second portions sufficient to create a critical angle at the interface smaller than the incident angle to reflect the signal off the interface. Thus, by switching the electric field generator off and on, the interface switches between being transparent and reflective to the optical signal to alter the unguided beam path through the crystal. A method of switching using such an electro-optic crystal is also disclosed.

Optical cross-connect system with space and wavelength division switching stages

OPTICAL TELECOMMUNICATIONS NETWORK

Time multiplexed space switch

Optical communications network

An optical communications system comprises an inner core mesh network, 13, a plurality of outer unidirectional ring networks 14 coupled to the core, and passive optical local networks 12 coupled to the outer networks whereby to provide access to terminals 11 coupled to the network. Information is transported across the network using time division multiplexing in combination with frequency division multiplexing; capacity is allocated to particular routes by giving those routes certain frequency/time-slot-within-multiplexing-cycle combinations. A line of the network may comprise a plurality of optical fibres. ...

Optical communications network

TRANSPARENT OPTICAL SWITCH

A transparent optical switch includes network management and performance monitoring using bit level information obtained by extracting selected information on a polling basis and analyzing the extracted information in the electrical domain. In one embodiment, a signal is injected into the switch fabric of the switch via a demultiplexing device. The injected signal is extracted at the output of the switching fabric via an N:1 switch and analyzed by a signal analyzer to verify input to output connections. In another embodiment, an optical switch includes first and second switch fabrics for 1:2 broadcast capability. In a further embodiment, an optical communication system includes a plurality of optical networks and a plurality of optical switches that cooperate to generate unequipped signals and to obtain autonomously switch-to-switch port connectivity information required for auto-topology discovery.

WAVELENGTH SELECTIVE OPTICAL DELAY LINE

L'invention propose un dispositif de brassage toutoptique comprenant au moins deux lignes à retard sélectives en longueur d'onde disposées en série, chacune desdites lignes à retard sélectives comprenant: -une ligne à retard (gj) pour retarder la propagation d'un signal optique par augmentation de la longueur du chemin optique parcouru, et - des moyens d'extraction et de réinjection (Cj) pour extraire un signal optique à une longueur d'onde donnée dans une structure guidante, et réinjecter ledit signal optique à la longueur d'onde donnée dans ladite structure guidante à travers ladite ligne à retard (gj) de sorte à appliquer un retard (jr) audit signal optique à la longueur d'onde donnée. Applications dans des systèmes de télécommunications optique à multiplexage en longueur d'onde.

Optical Packet Processing

FLEXIBLE ETHERNET SWITCHING SYSTEMS AND METHODS

A Flexible Ethernet (FlexE) switch system configured to switch a FlexE client service includes interface circuitry configured to ingress and egress a plurality of FlexE clients; and switch circuitry configured to switch portions of the FlexE clients based on 64b/66b block boundaries between the interface circuitry. A node configured to switch a Flexible Ethernet (FlexE) client service in a network includes one or more line cards configured to ingress and egress a plurality of FlexE clients; and one or more switch fabrics configured to switch portions of the FlexE clients based on 64b/66b block boundaries between the one or more line cards. 1. A Flexible Ethernet (FlexE) switch system configured to switch a FlexE client service , the switch fabric comprising:interface circuitry configured to ingress and egress a plurality of FlexE clients; andswitch circuitry configured to switch portions of the FlexE clients between the interface circuitry based on 64b/66b block boundaries.2. The FlexE switch system of claim 1 , wherein the portions comprise calendar slots claim 1 , and wherein the switch circuitry utilizes a synchronous switching scheme.3. The FlexE switch system of claim 1 , wherein the interface circuitry is configured to partially terminate a FlexE shim associated with the plurality of FlexE clients and provide access to 64b/66b blocks from the plurality of FlexE clients claim 1 , for phase and frequency alignment.4. The FlexE switch system of claim 1 , wherein the switch system is a native FlexE client 64b/66b switch system claim 1 , and wherein the interface circuitry is configured to perform timing synchronization comprising phase and frequency alignment between the 64b/66b block boundaries.5. The FlexE switch system of claim 1 , wherein the switch circuitry is a Synchronous Optical Network (SONET)/Synchronous Digital Hierarchy (SDH)-based switch claim 1 , and wherein the interface circuitry is configured to at least one of adapt and transcode 64b/66b blocks ...

METHOD OF OPTICAL DATA TRANSMISSION

Data is transmitted using multiple phase-modulated optical wavelength division multiplexed signals carrying respective synchronous data packet sequences. The data packet sequences comprise data packets within respective data packet time slots. The data packet time slots are separated by guard band time slots. Within at least one of the optical WDM signals, a data packet is detected. A time-discrete electrical signal is derived from the one optical WDM signal, by down converting the one optical WDM signal using a local oscillator optical signal. A first discrete spectral component of the time-discrete electrical signal is determined, which corresponds to a direct current component of the time-discrete electrical signal. A second discrete spectral component of the time-discrete electrical signal is determined, which corresponds to a symbol rate of the one optical WDM signal. A data packet is detected, in the case that a fraction between the spectral components exceeds a predefined threshold.

ALL-OPTICAL TIME SLICE SWITCHING METHOD AND SYSTEM BASED ON TIME SYNCHRONIZATION

An all-optical time slice switching method based on time synchronization is provided. With the method, continuous data streams in an optical network are assembled to time domain periodic optical time slices and are transmitted in an asynchronous transmission mode. Network nodes obtain high precision synchronization time via a network and control optical switches to switch arriving optical time slices to a target port at precise time points periodically, therefore all-optical switching is implemented. When a connection request arrives, an available path, a wavelength and time slots to be occupied are calculated by a source node according to information on available time slots of the optical network, and the time slots are reserved by a connection management module. After the time slots are reserved, the source node send optical time slices carrying services periodically at reserved time slots. A destination node restores the optical time slices to the data streams. Compared with an existing switching technology, the all-optical time slice switching method has remarkable advantages that reliable and flexible all-optical switching at sub-wavelength granularity can be implemented without participation of all-optical buffers and all-optical logic apparatus. 1. An all-optical time slice switching method based on time synchronization , comprising:determining an OTSS connection between a source node and a destination node according to a state of time slots of an optical network, wherein the OTSS connection comprises wavelength links between adjacent optical switching nodes;transmitting data streams to the destination node via the OTSS connection by the source node,wherein time domain periodic OTSS frames are used to transmit the data streams on the wavelength links; each OTSS frame comprises variable-length time slices and OTSS frames on a same wavelength link comprises same time slices; each group of periodic time slices constitute an OTSS sub-wavelength optical channel; ...

OPTOELECTRONIC SWITCH

A switch module and optoelectronic switch incorporating the same. The optoelectronic switch includes an N-dimensional array of switch modules arranged in a topology in which each switch module is a member of N sub-arrays, the sub-arrays defined with reference to the coordinates of the constituent switch modules, and wherein all of the members of each sub-array are connected by an active switch, which in some embodiments may be an optical active switch or an electronic active switch. 1. A switch module , for use in an optoelectronic switch , the switch module having:a client portion for connecting to an input device or an output device;a first fabric portion and a second fabric portion, each for processing signals and communicating with other switch modules, the first fabric portion having a transmission side and a receiving side, [ an output of the second fabric portion, or', 'an input device, via the client portion;, 'a transmission side input for receiving a first electronic signal carrying information including information about a destination switch module of the first electronic signal, the first electronic signal received from either, 'a transmission side conversion means for converting said first electronic signal into a first plurality of optical signals containing the same information;', 'a transmission side multiplexer for converting the first plurality of optical signals into a multiplexed fabric output signal for transmission to an active switch, and, 'the transmission side having a receiving side demultiplexer for receiving a multiplexed fabric input signal from an active switch and separating said multiplexed fabric input signal into a second plurality of optical signals;', 'a receiving side conversion means for converting the second plurality of optical signals into a second electronic signal, and', a transmission side input of the second fabric portion, or', 'an output device, via the client portion., 'a receiving side output for sending the second ...

DC-COUPLED LASER DRIVER WITH AC-COUPLED TERMINATION ELEMENT

An optical signal module including a driver and an optical signal module. The driver includes a differential pair configured to receive and process an input signal to create a drive signal. A modulation current source provides a modulation current to the differential pair. One or more termination resistors connected to the differential pair for impedance matching. A first switch, responsive to a first control signal, maintains charge on a charge storage device. The optical signal module includes an optical signal generator arranged between a supply voltage node and a bias current node. The optical signal generator receives the drive signal and generates an optical signal representing the input signal. A second switch is between a supply voltage node the bias current node. The second switch, responsive to second control signal, selectively establishes a short between the supply voltage node the bias current node. 1. An optical signal generator module including a driver , the module comprising:a driver configured to process at least one input signal to generate a drive signal;a first switch located between a supply voltage node and the driver, the first switch responsive to a first control signal;a charge storage device located between the supply voltage node and the first switch;an optical signal generator receiving the drive signal and responsive to the drive signal generating an optical signal;a second switch associated with the optical signal generator, the second switch responsive to a second control signal to selectively short voltage across the optical signal generator through the switch;one or more termination elements selected to impedance match the driver with the optical signal generator, the one or more termination resistors located between the supply voltage node and the driver mirror.29. The optical signal generator module of claim wherein the at least one input signal is a differential input signal.39. The optical signal generator module of claim ...

COMMUNICATION SYSTEM, COMMUNICATION APPARATUS, AND COMMUNICATION METHOD

There is provided a communication apparatus including a hardware processor configured to: count numbers of transmissions and receptions of a measurement frame assigned between frames when a communication of an active system is performed, by an active system counter, count numbers of transmissions and receptions of the measurement frame when a communication of a standby system is performed, assign switchover indication information for indicating an occurrence of the switchover from the active system to the standby system, to the measurement frame to be transmitted to other communication apparatus, and measure a data loss based on a count value of the active system counter or the standby system counter, by excluding frames transferred during a period of time from a transmission of the switchover indication information to a reception of the reception indication information transmitted from the other communication apparatus which has received the switchover indication information, from a measurement target. 1. A communication system comprising:a first communication apparatus capable of performing a switchover of a communication path from an active system to a standby system, and configured to include a first hardware processor configured to:count a number of transmissions and a number of receptions of a measurement frame assigned between frames transferred on the communication path when a communication of the active system is performed, by an active system counter,count the number of transmissions and the number of receptions of the measurement frame when a communication of the standby system is performed, by a standby system counter,measure a data loss based on a count value of the active system counter or the standby system counter, andassign switchover indication information for indicating an occurrence of the switchover from the active system to the standby system, to the measurement frame to be transmitted; anda second communication apparatus capable of performing ...

MAINTAINING CHANNEL-INVARIANT OPTICAL NETWORK UNIT (ONU) EQUALIZATION DELAY IN A PASSIVE OPTICAL NETWORK

A device determines a zero-distance equalization delay and an order for optical line terminal (OLT) channel terminations (CTs), and determines a round-trip propagation time between a first OLT CT, based on the order, and an optical network unit (ONU). The device determines an equalization delay based on the round-trip propagation time, and hands over the ONU to a next OLT CT. The device calculates a round-trip delay for the next OLT CT based on a propagation time between the next OLT CT and the ONU, a processing time of the ONU, and the equalization delay. The device compares the round-trip delay, for the next OLT CT, with the zero-distance equalization delay to obtain a comparison result, and alters the zero-distance equalization delay based on the comparison result. The device repeats the performing, the calculating, the comparing, and the altering for remaining OLT CTs. 1. A method , comprising: 'the zero-distance equalization delay including a delay associated with a fiber distance and a signal propagation time equal to zero;', 'determining, by a device, a zero-distance equalization delay for a plurality of channel terminations and an order for the plurality of channel terminations,'}determining, by the device, a round-trip propagation time between a first channel termination, based on the order for the plurality of channel terminations, and an optical network unit;determining, by the device, an equalization delay based on the round-trip propagation time;performing, by the device, a handover of the optical network unit to a next channel termination based on the order for the plurality of channel terminations; a propagation time between the next channel termination and the optical network unit,', 'a processing time associated with the optical network unit, and', 'the equalization delay;, 'calculating, by the device, a round-trip delay for the next channel termination based oncomparing, by the device, the round-trip delay, for the next channel termination, with ...

LASER BEAM COMBINING APPARATUS AND METHOD

A laser beam apparatus can include a set of pulsed lasers (e.g. solid state fiber lasers), a controllable beam deflector, and an electric power supply and controller connected to the beam deflector. The laser pulses from the different pulsed lasers can be configured to hit the beam deflector at different angles and different times. The electric power supply and controller can be configured to control and synchronize the timing and angle at which the different lasers pulses hit the beam deflector with an adjustment of the deflection property of the beam deflector so that the laser pulses from different input directions propagate in the same direction after passing through the beam deflector. The laser pulses from the lasers can be combined together via this control and synchronization. 1. A laser combining apparatus comprising:an array of lasers, each of the lasers configured to transmit laser pulses;a potassium tantalate-niobate (KTN) beam deflector positioned to receive the laser pulses from the lasers of the array of lasers such that the laser pulses pass through the KTN beam deflector to form a combined laser beam; andan electric power supply and controller connected to the KTN beam deflector that is configured to adjust deflection properties of the KTN beam deflector.2. The laser combining apparatus of claim 1 , wherein the electric power supply and controller is configured control timing of the laser pulses from the lasers of the array of lasers and is configured to adjust the deflection properties of the KTN beam deflector to synchronize timing and incident angle of the laser pulses with the deflection properties of the KTN beam deflector so that a propagation direction of the laser pulses after passing through a deflector body of the KTN beam deflector are the same regardless of an incident angle and/or incident direction at which the laser pulses hit a front surface of the deflector body of the KTN beam deflector.3. The laser combining apparatus of claim 2 , ...

HIGH CAPACITY FIBER-OPTIC INTEGRATED TRANSMISSION SYSTEMS

A high capacity node includes a plurality of receiver sections and a plurality of transmitter sections; and an electrical switching fabric between the plurality of receiver sections and the plurality of transmitter sections, wherein each of the plurality of receiver sections and the plurality of transmitter sections interface the electrical switching fabric at a full signal level and the electrical switching fabric is configured to perform flow switching on the full signal level between respective receiver sections and transmitter sections, and wherein the plurality of receiver sections, the plurality of transmitter sections, and one or more stages of the electrical switching fabric are implemented in one or more optoelectronic integrated circuits. 1. A high capacity node , comprising:a plurality of receiver sections and a plurality of transmitter sections; andan electrical switching fabric between the plurality of receiver sections and the plurality of transmitter sections,wherein each of the plurality of receiver sections and the plurality of transmitter sections interface the electrical switching fabric at a full signal level and the electrical switching fabric is configured to perform flow switching on the full signal level, andwherein the plurality of receiver sections, the plurality of transmitter sections, and one or more stages of the electrical switching fabric are implemented in one or more optoelectronic integrated circuits.2. The high capacity node of claim 1 , wherein the electrical switching fabric comprises optical switches at one or more stages.3. The high capacity node of claim 1 , wherein the one or more stages comprise a first stage integrated with the plurality of receiver sections and a second stage integrated with the plurality of transmitter sections.4. The high capacity node of claim 3 , wherein the electrical switching fabric comprises a third stage between the first stage and the second stage with the third stage on a separate circuit.5. ...

PACKET-BASED OPTICAL SIGNAL SWITCHING CONTROL METHOD AND APPARATUS

An optical switching control method and apparatus. The method includes generating an optical switching path corresponding to a destination node of service traffic flowing from an external service network, generating an optical frame corresponding to the generated optical switching path, transmitting, to a control server, a request message for requesting an allocation of a time slot to transmit the generated optical frame, generating an optical signal having a predetermined wavelength to transmit the optical frame in response to an admission message being received as a result of admission with respect to the request message, and transferring the optical frame to the destination node based on the optical switching path using the generated optical signal. 1. An optical switching control method performed by a data plane of a packet-based optical signal network , the optical switching control method comprising:generating an optical switching path corresponding to a destination node of service traffic flowing from an external service network;generating an optical frame corresponding to the generated optical switching path;transmitting, to a control server, a request message for requesting an allocation of a time slot and the optical switching path to transmit the generated optical frame;generating an optical signal having a predetermined wavelength to transmit the optical frame in response to an admission message being received as a result of admission with respect to the request message;setting an optical switching path for transmitting the optical signal by designating an input and output port and a switching port for switching the optical signal; andtransferring the optical frame to the destination node based on the set optical switching path and the time slot.2. The optical switching control method of claim 1 , wherein the transferring includes transferring the optical frame using an arrayed waveguide grating router (AWGR) that changes an optical switching path based ...

Optically connectable controller using passive optical devices

An optical connectable controller is disclosed. The optical connectable controller includes an optical splitter, an optical combiner, an optical reception unit, an optical transmission unit, and a communication control unit. The optical splitter splits an optically received downstream optical signal into a branch optical signal and a pass-through optical signal. The optical combiner optically combines an outgoing optical signal and an upstream optical signal into a combined upstream optical signal. The optical reception unit receives the branch optical signal, and converts the branch optical signal into an incoming electric signal to be transferred to the communication control unit. The optical transmission unit receives the outgoing electric signal, and converts the outgoing electric signal into the outgoing optical signal. The communication control unit extracts an address, outputs control commands or data or discards the incoming electric signal, generates the outgoing electric signal, and outputs the outgoing electric is signal.

OPTICAL NETWORK SYSTEM, OPTICAL SWITCH NODE, MASTER NODE, AND NODE

An optical network system includes a master node and a plurality of optical switch nodes, allowing the number of nodes without depending on the number of wavelengths. The master node is configured to: divide a wavelength path having an arbitrary wavelength into time slots each having a predetermined time period; and allocate the time slots to each of the optical switch nodes. Each of the optical switch nodes is configured to: synchronize the time slots based on information delivered from the master node; and thereby transmit or receive a data or performs route switching. 1. An optical network system , comprising:a master node; anda plurality of optical switch nodes,wherein the master node is configured to divide a wavelength path having an arbitrary wavelength into time slots each having a prescribed time period, and allocate the time slots to each of the optical switch nodes, andwherein each of the optical switch nodes is configured to synchronize the time slots based on information on the allocation delivered from the master node, and thereby transmit or receive a data or perform route switching.2. The optical network system according to claim 1 ,wherein each of the optical switch nodes is configured to synchronize the time slot based on a trigger delivered from the master node.3. The optical network system according to claim 2 ,wherein the trigger contains therein time slot information showing instruction contents on data processing.4. The optical network system according to claim 1 ,wherein the master node is configured to deliver a control signal including a time slot start time and a time stamp to each of the optical switch nodes, andwherein, upon receipt of the control signal from the master node, each of the optical switch nodes is configured to synchronize the time slots and thereby transmit or receive a data or perform route switching, based on a time common to all of the optical switch nodes, the common time being determined by setting a time shifted by a ...

METHOD AND APPARATUS FOR LOCAL PATH PROTECTION

A method of local path protection in a node on a shared alternative path of a network. The method comprising receiving a signal switched on a primary label switched path (LSP). The signal is switched by lambda-switching or time-division multiplex TDM switching. The method further comprises receiving identification information arranged to identify the signal, and forwarding the signal on the alternative path based on the identification information. 1. A method of local path protection in a node on a shared alternative path of a network , comprising:receiving a signal previously on a primary label switched path (LSP),wherein the signal is switched by at least one of lambda-switching and time-division multiplex (TDM) switching;receiving identification information arranged to identify the signal; andforwarding the signal on the shared alternative path based on the identification information.2. (canceled)3. The method as claimed in claim 1 , wherein the forwarding the signal on the shared alternative path is based on the identification information and the primary (LSP).4. The method as claimed in claim 1 , wherein the signal is a lambda or a time-division multiplexed data unit.5. The method as claimed in claim 1 , wherein the identification information is in a data plane.6. The method as claimed claim 1 , wherein the identification information is configured to identify the primary label switched path at a network level.7. The method as claimed in claim 1 , wherein a cross-connection of the node on the shared alternative path is associated with the identification information claim 1 , such that the cross-connection is selected based on the received identification information.8. The method as claimed in claim 1 , wherein the node of the shared alternative path is pre-configured with cross-connections claim 1 , and the identification information received with the signal determines which of the cross-connections is used by the node of the shared alternative path to forward ...

OPTICAL NETWORK SWITCHING NODE IN MULTI-CHASSIS CLUSTER, OPTICAL BURST SYNCHRONIZATION METHOD, AND LINE CARD CHASSIS

An embodiment of the present invention provides an optical burst synchronization method. A synchronization method includes: selecting a reference chassis, and transmitting, by an output port corresponding to an FTL in the reference chassis, an optical burst test signal respectively to receive ports corresponding to ORs in other line card chassis, where the optical burst test signal carries a transmission timeslot number; and acquiring, by a receive port corresponding to an OR in each line card chassis, according to an optical path difference between the receive port corresponding to the OR in each line card chassis and the output port corresponding to the FTL in the reference chassis, time of receiving the optical burst test signal, and the transmission timeslot number, a time-phase difference between each line card chassis and the reference chassis, and calibrating a local clock phase according to the time-phase difference.

DC-COUPLED LASER DRIVER WITH AC-COUPLED TERMINATION ELEMENT

An optical signal module including a driver and an optical signal module. The driver includes a differential pair configured to receive and process an input signal to create a drive signal. A modulation current source provides a modulation current to the differential pair. One or more termination resistors connected to the differential pair for impedance matching. A first switch, responsive to a first control signal, maintains charge on a charge storage device. The optical signal module includes an optical signal generator arranged between a supply voltage node and a bias current node. The optical signal generator receives the drive signal and generates an optical signal representing the input signal. A second switch is between a supply voltage node the bias current node. The second switch, responsive to second control signal, selectively establishes a short between the supply voltage node the bias current node. 1. An optical signal module including a driver , the module comprising: a differential pair include a first transistor configured to receive a first input signal and a second transistor configured to receive a second input signal, the first signal and the second signal being a differential input signal, the differential pair configured to supply a first drive signal and a second drive signal in response to the first input signal and the second input signal;', 'a modulation current source providing a modulation current to the differential pair;', 'one or more termination elements connected to the differential pair;', 'a first switch, responsive to a first control signal, having a first terminal and a second terminal, the first terminal connected to at least one of the one or more termination elements;', 'a charge storage device connected to the second terminal of the first switch and a supply voltage node;', 'an optical signal module including an optical signal generator arranged between the supply voltage node and a bias current node, the optical signal ...

SYSTEM AND METHOD FOR VIRTUAL NETWORK TOPOLOGIES AND VPN IN MULTI-LAYER NETWORKS

Systems and methods for a multi-layer network to achieve network resource isolation among clients using the same server network, such as a VPN in a multi-layered network and interaction within the node, may include interaction between a server layer (e.g. L0 Photonic network) and the client layer (e.g. L1 network) that help the client layer (L1) gather information about the server-layer (L0) connection affinities. For example, the use of server layer (L0) connection affinities to construct Virtual Network Topologies (VNT) and/or network abstractions for customer traffic isolations in client layer (L1), the use of VNT to offer physical and/or logical network resource isolation for L1 customers, and provide L1 VPN services in a multi-layer environment. 1. A method comprising:configuring a first optical link in a photonic network, the photonic network configured to transport each of a plurality of optical signals, each of the plurality of optical signals having a respective one of a plurality of wavelengths;assigning a first optical signal of the plurality of optical signals to the first optical link, the first optical signal having a first wavelength of the plurality of wavelengths;assigning the first optical link to a first grouping of optical links of the photonic network;associating the first grouping of optical links with a plurality of switches;associating the first optical signal with the plurality of switches;associating the first grouping of optical links and the first optical signal with a controller of a time division multiplexed network, the time division multiplexed network configured to transport each of a plurality of packets with a digital frame format in a respective one of a plurality of time slots and the controller comprises a memory and a logic circuit configured to communicate with the plurality of switches; andtransmitting the first optical signal over the first optical link.2. The method of claim 1 , further comprising:assigning the first ...

TRANSMISSION METHOD AND SYSTEM FOR IMPROVED UNIDIRECTIONAL OR BIDIRECTIONAL DATA TRANSMISSION OVER TELECOMMUNICATION NETWORK, POLARIZATION ATTRACTOR CIRCUIT, COMPUTER PROGRAM AND COMPUTER PROGRAM PRODUCT

The subject matter of the invention relates to a transmission method and system () for improved unidirectional or bidirectional data transmission over a telecommunication network, a polarization attractor circuit (A A B B), a computer program and a computer program product therefore. 112212561256141414141413243737121213121224242448482312. A polarization attractor circuit (A; A; B) designed for an improved bidirectional data transmission over a telecommunications network , characterized in that it comprises: polarization controllers (PC , PC; PC , PC) , respectively , designed for changing the polarization state of signals , wherein said polarization controllers (PC , PC; PC , PC) are connected to at least one polarizing beam splitter (PBS; PBS) , respectively , wherein at least one polarizing beam splitter (PBS; PBS) is designed for combining signals into a common output of the polarizing beam splitter (PBS; PBS) on the one side in one data transmission direction and for splitting signals into separate outputs from said polarizing beam splitter (PBS; PBS) and on the other side in the opposite data transmission direction , wherein said at least one polarizing beam splitter (PBS; PBS) is connected to a switching element (F; F) , respectively , which in turn is connected to switching element (F; F) , respectively , and to a polarization controller (PC; PC) , respectively , wherein the polarization controller (PC; PC) is connected to an attenuator (VOA; VOA) , respectively , and said attenuator (VOA; VOA) is connected to a splitting element (S; S) , respectively , which in turn is connected to a nonlinear element (NLE; NLE) , respectively , through which nonlinear element (NLE; NLE) is connected to a coupling element (S; S) , respectively , wherein said coupling element (S; S) is subsequently connected to the switching element (F; F) , respectively , and to the polarization controller (PC; PC) , respectively , through which polarization controller (PC; PC) is connected ...

MODULAR HIGH-CAPACITY SWITCH

A modular optical switch includes a set of optical switch modules connected in a mesh, a master controller for the whole optical node and a switch-module controller for each of the optical switch modules. The optical switch modules receive optical signals from, and transmit optical signals to, edge nodes based on connection requests received from the edge nodes. The master controller acts to select a path, using a simple or compound time-slot matching process, through the mesh of switch modules for each optical signal related to a connection request. Advantageously, the optical switch modules are fast switching, enabling the use of time-sharing schemes such as TDM, and the modular optical core node is made practical by efficient path selection at the master controller. A hybrid modular switch may include both optical and electronic switch modules, a master controller, and a switch-module controller for each of the switch modules. 1. A switching node , comprising:a plurality of inlet ports;a plurality of outlet ports;a plurality of inner links; and designating a route set for a combination comprising the particular inlet port and the particular outlet port, the route set comprising at least one route traversing two of the inner links between the particular inlet port and the particular outlet port;', 'selecting a candidate time slot; and', determining, from a calendar associated with the particular inlet port, an occupancy state of the particular inlet port for the candidate time slot;', 'determining, from a calendar associated with the particular outlet port, an occupancy state of the particular outlet port for the candidate time slot;', 'determining, from a calendar associated with a first inner link in said candidate route, an occupancy state of the first inner link in the candidate route for the candidate time slot; and', considering the candidate route to be a first available route; and', 'considering the candidate time slot to be an allocable time slot., 'when ...

Network with a Fast-Switching Optical Core Providing Widely Varying Flow-rate Allocations

Multiple switch planes, each having meshed bufferless switch units, connect source nodes to sink nodes to form a communications network. Each directed pair of source and sink nodes has a first-order path traversing a single switch unit in a corresponding switch plane and multiple second-order paths each traversing two switch units in one of the remaining switch planes. To reduce processing effort and minimize requisite switching hardware, connectivity patterns of source nodes and sink nodes to the switch planes are selected so that each pair of source node and sink node connects only once to a common switch unit. Widely-varying flow rates may be allocated from each source node to the sink nodes. To handle frequent changes of flow-rate allocations, in order to follow variations of traffic distribution, a high-throughput scheduling system employing coordinated multiple scheduler units is provided in each switch plane. 1. A communications network comprising:a plurality of switch units arranged in a plurality of switch planes, each switch plane comprising a set of switch units interconnected in a full mesh;a plurality of source nodes, each source node connecting to a respective switch unit in said each switch plane;a plurality of sink nodes, each sink node connecting to a respective switch unit in said each switch plane; and each source node of said plurality of source nodes has a dedicated upstream time-limited control path to said switch-plane controller; and', 'said switch-plane controller has a dedicated downstream time-limited control path to each sink node of said plurality of sink nodes; and', 'each pair of source node and sink node connects only once to a common switch unit of said plurality of switch units., 'a switch-plane controller coupled to all switch units of said set of switch units wherein2. The communications network of wherein source nodes connecting to a same switch unit have mutually non-coincident dedicated upstream time-limited control paths to ...

System and Method for Photonic Switching

In one embodiment, a method of photonic frame scheduling includes receiving, by a photonic switching fabric from a top of rack (TOR) switch, a frame request requesting a time slot for switching an optical frame to an output port of a photonic switch of the photonic switching fabric and determining whether the output port of the photonic switch is available during the time slot, and generating a contention signal including a grant or a rejection, in accordance with the determining. Also, the method includes assigning the time slot to the TOR switch for the output port of the photonic switch, when the contention signal includes the grant, transmitting, by the photonic switching fabric to the TOR switch, the contention signal and receiving, by the photonic switching fabric from the TOR switch, the optical frame during the time slot, when the contention signal includes the grant. 1. A method of photonic frame scheduling , the method comprising:receiving, by a photonic switching fabric from a first top of rack (TOR) switch, a first frame request requesting a first time slot for switching a first optical frame to a first output port of a photonic switch of the photonic switching fabric;determining whether the first output port of the photonic switch is available during the first time slot;generating a first contention signal comprising a grant or a rejection, in accordance with the determining;assigning the first time slot to the first TOR switch for the first output port of the photonic switch, when the first contention signal comprises the grant;transmitting, by the photonic switching fabric to the first TOR switch, the first contention signal; andreceiving, by the photonic switching fabric from the first TOR switch, the first optical frame during the first time slot, when the first contention signal comprises the grant.2. The method of claim 1 , further comprising claim 1 , when the first contention signal comprises the rejection:determining whether the first output ...

Spectral-Temporal Connector for Full-Mesh Networking

A spectral-temporal connector interconnects a large number of nodes in a full-mesh structure. Each node connects to the spectral-temporal connector through a dual link. Signals occupying multiple spectral bands carried by a link from a node are de-multiplexed into separate spectral bands individually directed to different connector modules. Each connector module has a set temporal rotators and a set of spectral multiplexers. A temporal rotator cyclically distributes segments of each signal at each inlet of the rotator to each outlet of the rotator. Each spectral multiplexer combines signals occupying different spectral bands at outlets of the set of temporal rotators onto a respective output link. Several arrangements for time-aligning all the nodes to the connector modules are disclosed. 1. A network comprising:a master time indicator;a plurality of temporal rotators arranged into a plurality of temporal-rotator groups, each temporal rotator comprising a respective timing circuit coupled to said master time indicator;a plurality of spectral demultiplexers each spectral demultiplexer configured to direct each spectral band of a respective input link of a plurality of input links, each input link carrying multiple spectral bands, to a respective temporal rotator in each temporal-rotator group;a plurality of spectral multiplexers, each spectral multiplexer configured to combine output spectral bands from temporal rotators of a respective temporal-rotator group into a respective output link of a plurality of output links;and at least one input link of said plurality of input links and at least one output link of said plurality of output links;', 'respective data sources; and', 'respective data sinks., 'a plurality of nodes, each node coupled to2. The network of further comprising a central controller coupled to at least one input link of said plurality of input links and at least one output link of said plurality of output links claim 1 , said central controller ...

Data Processing Method, Communications Board and Device

Embodiments of the present invention provide a data processing method, a communications board and a device. The method includes: acquiring, by a first communications board, an optical channel data unit ODU data flow; performing, by the first communications board, slicing processing on the ODU data flow according to a fixed frame frequency, so as to obtain various slices, where each slice includes a section of continuous ODU data in the ODU data flow; separately encapsulating, by the first communications board, each slice into an Ethernet frame; and sending, by the first communications board, each Ethernet frame to a time division multiplexing TDM service switching module in an Ethernet switching chip, so that the TDM service switching module sends each Ethernet frame to a second communications board to which a destination MAC address carried in the Ethernet frame directs. 1. A data processing method , applied in a data switching device comprising a first communications board , a second communications board and a time division multiplexing (TDM) service switching module , comprising:acquiring, by the first communications board, an optical channel data unit (ODU) data flow;performing, by the first communications board, slicing processing on the ODU data flow according to a fixed frame frequency, so as to obtain slices of ODU data;encapsulating, by the first communications board, each slice of the ODU data into an Ethernet frame, wherein the Ethernet frame carries a destination Media Access Control (MAC) address and a payload area, wherein the destination MAC address directs to the second communications board and the payload area is used to store a slice of the ODU data and a serial number of the slice of the ODU data; andsending, by the first communications board, each Ethernet frame to the TDM service switching module.2. The method according to claim 1 , wherein both an Ethernet interface of the first communications board and an Ethernet interface of the second ...

CASCADE-FORM WAVELENGTH DIVISION MULTIPLEXING OPTOELECTRONIC TRANSCEIVER DEVICE, SYSTEM AND METHOD

The invention relates to an optoelectronic transceiver device comprising a first optical connector (OC1) capable of connection to a first bidirectional optical fibre (OF1), and a second optical connector (OC2) capable of connection to a second bidirectional optical fibre (OF2), the device further comprising: an insertion-extraction module (ADM) capable of: extracting a wave-length (λ) from a plurality of wavelengths constituting a first optical signal received by the first optical connector (OC1) and transmitting the first optical signal without the extracted wavelength to the second optical connector (OC2); inserting a wavelength (λ) into a second optical signal received by the second optical connector (OC2) and transmitting the second optical signal with the inserted wavelength to the first optical connector (OC1); an electric-optical conversion module (EC1) capable of providing the insertion-extraction module with the wavelength (λ) inserted into the second optical signal from an incoming electric signal (Data Tx); and an optical-electric conversion module (EC2) capable of converting the wavelength (λ) extracted from the first optical signal by the insertion-extraction module into an outgoing electric signal (Data Rx). 11122. An optoelectronic emitter-receiver device comprising a first optical connector (OC) able to be connected to a first bidirectional optical fiber (OF) , and a second optical connector (OC) able to be connected to a second bidirectional optical fiber (OF) , the device furthermore comprising: [{'sub': 'Rx', 'b': 1', '2, 'extract a wavelength (λ) in a plurality of wavelengths making up a first optical signal received by the first optical connector (OC) and transmit the first optical signal without the extracted wavelength to the second optical connector (OC);'}, {'sub': 'Tx', 'b': 2', '1, 'insert a wavelength (λ) into a second optical signal received by the second optical connector (OC) and transmit the second optical signal with the inserted ...

Optical Buffer and Methods for Storing Optical Signal

An optical buffer and a method for storing an optical signal using the optical buffer, where the optical buffer includes a first waveguide, a first optical delay waveguide loop and a controller. The first waveguide includes a first arm and a second arm, where a first end of the first arm is an input end of the optical buffer, and a second end of the second arm is an output end of the optical buffer. A second end of the first arm connects to a first end of the second arm. The first optical delay waveguide loop connects to the first arm at a first end using a first optical switch, and a second part of the first optical delay waveguide loop connects to the second arm at a second end using a second optical switch. The controller connects to the first optical switch and the second optical switch respectively. 1. An optical buffer comprising:a first waveguide comprising a first arm and a second arm, wherein a first end of the first arm is an input end of the optical buffer, wherein a second end of the first arm connects to a first end of the second arm, wherein a second end of the second arm is an output end of the optical buffer, and wherein the first waveguide is configured to receive a first optical signal from the first end of the first arm;a first optical delay waveguide loop, wherein the first optical delay waveguide loop is connected to the first arm of the first waveguide at a first end using a first optical switch, and wherein the first optical delay waveguide loop is connected to the second arm of the first waveguide at a second end using a second optical switch; and turn on the first optical switch to allow the first optical signal to enter the first optical delay waveguide loop to be buffered; and', 'turn on the second optical switch to allow the first buffered optical signal to exit the second arm of the first waveguide at the output end when the first optical signal is needed to be output., 'a controller connected to the first optical switch and the second ...

SYSTEM AND METHOD FOR SETTING DOWNSTREAM FORWARD ERROR CORRECTION CODE IN TIME DIVISION MULTIPLEXING PASSIVE OPTICAL NETWORK

Provided are a system and method for setting a downstream forward error correction code for a downstream frame which is transmitted from an optical line terminal to an optical network unit in a time division multiplexing passive optical network. A system for setting a downstream forward error correction code in a time division multiplexing passive optical network includes: an optical line terminal configured to change a downstream forward error correction (FEC) indication included in a downstream frame and set a downstream FEC indication counter included in the downstream frame to transmit the downstream frame; and an optical network unit configured to receive the downstream frame from the optical line terminal and synchronize an FEC setting of the optical network unit with the FEC setting of the optical line terminal as a result of detection of the downstream FEC indication and downstream FEC indication counter included in the downstream frame. 1. A system for setting a downstream forward error correction code in a time division multiplexing passive optical network , the system comprising:an optical line terminal configured to change a downstream forward error correction (FEC) indication included in a downstream frame and set a downstream FEC indication counter included in the downstream frame to transmit the downstream frame; andan optical network unit configured to receive the downstream frame from the optical line terminal and synchronize an FEC setting of the optical network unit with the FEC setting of the optical line terminal as a result of detection of the downstream FEC indication and downstream FEC indication counter included in the downstream frame.2. The system of claim 1 , wherein the optical line terminal receives a downstream FEC setting change request signal claim 1 , changes a downstream FEC indication of a downstream frame according to the downstream FEC setting change request signal claim 1 , and indicates whether to apply FEC to the downstream ...

SYSTEMS AND METHODS FOR PERFORMING OPTICAL LINE TERMINAL (OLT) FAILOVER SWITCHES IN OPTICAL NETWORKS

A system for performing failover switches in an optical network, such as a time and wavelength division passive optical networks (TWDM PON) like NG-PON2, includes a backup optical line terminal (OLT) for backing up communications of a primary OLT. The backup OLT is configured to allocate small upstream time slots, referred to herein as “de minimis” time slots, to at least one optical network terminal (ONT) communicating with the primary OLT during normal operation. When a failure occurs that prevents communication between the ONT and the primary OLT, the ONT autonomously tunes to the upstream and downstream wavelength pairs of the backup OLT and begins to transmit data to the backup OLT in the de minimis time slot allocated to it. The presence of data in the de minimis time slot indicates the occurrence of a failover switch to the backup OLT, and the backup OLT then begins to allocate time slots to this ONT, which is normally serviced by the primary OLT according to its normal TDM algorithm. 1. An optical network , comprising:an optical fiber;a first optical line terminal (OLT) coupled to the optical fiber;an optical network terminal (ONT) having a tunable optical transmitter coupled to the optical fiber and a tunable optical receiver coupled to the optical fiber, the ONT configured to tune the tunable optical transmitter and the tunable optical receiver to a first wavelength pair of the first OLT for communication with the first OLT through the optical fiber; anda second OLT coupled to the optical fiber and configured to communicate with the ONT through the optical fiber, the second OLT configured to allocate a first plurality of time slots to the ONT prior to detecting a failover switch associated with the ONT, at least one of the first plurality of time slots allocated to the ONT by the second OLT while the tunable optical transmitter and the tunable optical receiver are tuned to the first wavelength pair for communication with the first OLT,wherein the ONT is ...

Method and Device for Channel Switching, Optical Network Unit, and Time Wavelength Division Multiplexing System

The present disclosure discloses a method and device for channel switching, an Optical Network Unit (ONU) and a system for Time Wavelength Division Multiplexing (TWDM). The method for channel switching includes that: an ONU acquires channel information of a first TWDM channel, wherein the channel information of the first TWDM channel is used for indicating an uplink wavelength and/or downlink wavelength of the first TWDM channel; and the ONU tunes the uplink wavelength and/or downlink wavelength of the ONU into the uplink wavelength and/or downlink wavelength of the first TWDM channel according to the channel information of the first TWDM channel. By means of the present disclosure, the problem of high cost caused by specially building a standby channel for each TWDM channel in a system for TWDM Passive Optical Network (PON) to provide service protection is solved, and the cost of deploying the TWDM PON system is reduced.

SYSTEM AND METHODS FOR COHERENT OPTICAL EXTENSION

A coherent passive optical network extender apparatus includes an extender transceiver for communication with an associated optical headend. The extender transceiver includes at least one receiving portion, at least one transmitting portion, and an extension processor. The apparatus further includes a signal adaptation unit configured to convert a downstream electrical transmission lane into a plurality of individual wavelengths. Each of the converted individual wavelengths are for transmission to one of an optical node and an end user. The apparatus further includes a plurality of transceivers, disposed within the signal adaptation unit, and configured to process and transmit the converted individual wavelengths as a bundle for retransmission to the respective end users. 1. A coherent passive optical network extender apparatus , comprising:an extender transceiver for communication with an associated optical headend, the extender transceiver including at least one receiving portion, at least one transmitting portion, and an extension processor;a signal adaptation unit configured to convert a downstream electrical transmission lane into a plurality of individual wavelengths, each of the converted individual wavelengths being for transmission to one of an optical node and an end-user; anda plurality of transceivers, disposed within the signal adaptation unit, and configured to process and transmit the converted individual wavelengths as a bundle for retransmission to the respective end users.2. The apparatus of claim 2 , wherein the PON is one or more of a next generation PON network or a 100G-EPON network.3. The system of claim 1 , wherein the OLT implements one or more of dense/ultra-dense wavelength division multiplexing (DWDM) and time and wavelength division multiplexing (TWDM).4. The apparatus of claim 1 , wherein the extender processor includes one or more of an analog to digital converter (ADC) claim 1 , a digital signal processor (DSP) claim 1 , an ...

Wireless communication system and transmitter

In a wireless communication system, a transmitter that transmits data and a plurality of receivers wirelessly communicate with each other. The transmitter includes a first storage unit that stores first identification information of one of the receivers; a first communication unit that transmits the data; and a switching unit that switches a transmission destination of the data to another receiver having the first identification information stored in the first storage unit. The receiver includes a second storage unit that stores second identification information of a plurality of the transmitters; and a second communication unit that receives the data from the transmitter having the second identification information. Both the transmitter and the receiver store the first identification information and the second identification information to each other.

OTN SWITCHING SYSTEMS AND METHODS USING AN SDN CONTROLLER AND MATCH/ACTION RULES

A method and network include receiving a Time Division Multiplexing (TDM) connection; determining information in overhead of the TDM connection; and if match/action rules defined by controller exist for the TDM connection, establishing the TDM connection based on matching an associated rule in the match/action rules. A Software Defined Networking (SDN) controller is configured to receive a request from a node related to a new TDM connection in the network; determine one or more routes in the network for the new TDM connection; determine match/action rules for the one or more routes at associated nodes of the one or more nodes; if the one or more routes include at least two routes, determine a group table at associated nodes of the one or more nodes to distinguish between the at least two routes; and provide the match/action rules and the group table to the associated nodes. 1. A method , comprising:receiving a Time Division Multiplexing (TDM) connection;determining information in overhead of the TDM connection; andif match/action rules defined by a Software Defined Networking (SDN) controller exist for the TDM connection, establishing the TDM connection based on matching an associated rule in the match/action rules with the information.2. The method of claim 1 , further comprising:establishing the TDM connection by creating cross-connects for the TDM connection based on the match/action rules.3. The method of claim 1 , further comprising:if match/action rules do not exist for the TDM connection, sending a request to the SDN controller for the SDN controller to determine a path and provide the match/action rules.4. The method of claim 3 , further comprising:subsequent to the sending the request, receiving the match/action rules from the SDN controller; andcreating cross-connects for the TDM connection based on the match/action rules.5. The method of claim 1 , further comprising:subsequent to the establishing, utilizing a group table to implement protection of the TDM ...

TRANSMISSION APPARATUS AND TRANSMISSION METHOD

A transmission apparatus includes: a plurality of first devices; and a second device configured to output a data signal shared by the plurality of first devices and respective first clock signals to each of the plurality of first devices, and to control the plurality of first devices individually based on the respective first clock signals. 1. A transmission apparatus comprising:a plurality of first devices; anda second device configured to output a data signal shared by the plurality of first devices and respective first clock signals to each of the plurality of first devices, and to control the plurality of first devices individually based on the respective first clock signals.2. The transmission apparatus according to claim 1 , wherein the second device is configured to output a second clock signal having a level to a first device other than a target to be accessed among the plurality of first devices.3. The transmission apparatus according to claim 1 , wherein the second device is coupled with the plurality of first devices by an I2C (Inter Integrated Circuit) interface.4. The transmission apparatus according to claim 1 , wherein a communication speed of at least one of the plurality of first devices is different from a communication speed of the second device.5. The transmission apparatus according to claim 1 , wherein the second device includes:an address identification circuit configured to output a device selection signal for selecting one of the plurality of first devices based on an address, anda device selection circuit configured to output a control signal for controlling the first clock signals based on the device selection signal.6. The transmission apparatus according to claim 1 , wherein the second device includes a plurality of clock selection circuits each configured to output the first clock signal among the first clock signals to a corresponding first device among the plurality of first devices.7. The transmission apparatus according to claim 6 , ...

TRANSMISSION APPARATUS AND TRANSMISSION METHOD

A transmission apparatus includes: a first input-output unit; a second input-output unit; a third input-output unit located in a first direction that is a transmission direction from the first input output unit and the second input-output unit; and a switch coupled to the first input-output unit, the second input-output unit, and the third input-output unit, wherein the first input-output unit requests the third input-output unit via the switch to notify in a second direction opposite to the first direction of a defect upon detecting the defect, wherein the third input-output unit transmits defect information indicating the defect to one of the first input-output unit and the second input-output unit via the switch in response to a requesting from the first input-output unit. 1. A transmission apparatus comprising:a first input-output unit;a second input-output unit;a third input-output unit located in a first direction that is a transmission direction from the first input output unit and the second input-output unit; anda switch coupled to the first input-output unit, the second input-output unit, and the third input-output unit,wherein the first input-output unit requests the third input-output unit via the switch to notify in a second direction opposite to the first direction of a defect upon detecting the defect; andwherein the third input-output unit transmits defect information indicating the defect to one of the first input-output unit and the second input-output unit via the switch in response to a requesting from the first input-output unit.2. The transmission apparatus according to claim 1 , wherein the first input-output unit requests the third input-output unit using a first signal to be transmitted via the switch claim 1 , a overhead region of the first signal including a notification of the defect.3. The transmission apparatus according to claim 1 , wherein the third input-output unit transmits to one of the first input-output unit and the second input ...

HIGH CAPACITY FIBER-OPTIC INTEGRATED TRANSMISSION SYSTEMS

A high capacity node includes a plurality of transceivers each with a transmitter configured to support a wavelength within a full transparent window of one or more optical fibers; and one or more optical amplifiers covering the full transparent window, wherein the one or more optical amplifiers comprise one of (i) a single ultra-wideband amplifier covering the full transparent window and (ii) a plurality of amplifiers each supporting a different band of the full transparent window. 1. A high capacity node , comprising:a plurality of transceivers each with a transmitter configured to support a wavelength within a full transparent window of one or more optical fibers; andone or more optical amplifiers covering the full transparent window, wherein the one or more optical amplifiers comprise one of (i) a single ultra-wideband amplifier covering the full transparent window and (ii) a plurality of amplifiers each supporting a different band of the full transparent window.2. The high capacity node of claim 1 , wherein the full transparent window is about 1270 to about 1670 nm.3. The high capacity node of claim 1 , wherein the plurality of transceivers support at least 128λ over the full transparent window.4. The high capacity node of claim 1 , wherein the single ultra-wideband amplifier comprises a quantum-dot amplifier.5. The high capacity node of claim 1 , wherein the plurality of amplifiers each comprise narrow-band optical amplifiers covering a portion of the full transparent window.6. The high capacity node of claim 1 , wherein the one or more optical fibers comprise a multi-core fiber.7. The high capacity node of claim 1 , wherein the plurality of transceivers are implemented as an optoelectronic integrated circuit in a Complementary metal-oxide-semiconductor (CMOS) wafer.8. The high capacity node of claim 1 , wherein the plurality of transceivers are communicatively coupled over the one or more optical fibers to a second set of a plurality of transceivers in a data ...

Time Slot Allocation for Burst Switched Network

Anode for burst switching of traffic flows in an optical network switches bursts of traffic flows in different time slots. Time slots are allocated () so that a time gap between successive allocated time slots is selected according to a jitter specification of the traffic flow. A map of the allocations controls a burst switch to pass the bursts in their allocated time slots (). By making the time gap between allocated time slots for successive bursts selectable, the jitter can be controlled more precisely, or the proportion of time slots filled can be increased resulting in better utilisation of available bandwidth. The allocation can be made hop by hop. The map can be generated in a distributed and duplicated manner at each node. The allocation can be updated to adapt to changes bandwidth demands. 1. A method of configuring a node for burst switching of traffic flows in an optical network , having the steps of:receiving indications relating to a traffic flow to be scheduled comprising at least an indication of a destination node and of a jitter specification for the traffic flow, the traffic flow comprising a series of bursts, andallocating bursts of that traffic flow to time slots of at least one optical network frame having a destination corresponding to the indicated destination node of the traffic flow, wherein a time gap between successive allocated time slots is selected according to the jitter specification of the traffic flow, andconfiguring the node, before the traffic flow arrives at the node, to enable the node to switch the bursts towards the respective destination node in their allocated time slots.2. The method of having the subsequent step of repeatedly adapting the allocation of the bursts of that traffic flow and allocations of bursts of other existing traffic flows in the optical network.3. The method of claim 1 , having the step of:receiving an indication of a desired bandwidth for the traffic flow,wherein the step of allocating comprises: ...

Spectral-Temporal Connector for Full-Mesh Networking

A spectral-temporal connector interconnects a large number of nodes in a full-mesh structure. Each node connects to the spectral-temporal connector through a dual link. Signals occupying multiple spectral bands carried by a link from a node are de-multiplexed into separate spectral bands individually directed to different connector modules. Each connector module has a set temporal rotators and a set of spectral multiplexers. A temporal rotator cyclically distributes segments of each signal at each inlet of the rotator to each outlet of the rotator. Each spectral multiplexer combines signals occupying different spectral bands at outlets of the set of temporal rotators onto a respective output link. Several arrangements for time-aligning all the nodes to the connector modules are disclosed. 1. A method of routing signals from a set of input links , each input link carrying multiple spectral bands , to a set of output links , the method comprising:arranging a plurality of temporal rotators into temporal-rotator groups;directing each spectral band of said each input link to a respective temporal rotator in each temporal-rotator group; andfor each temporal-rotator group, combining output spectral bands of different temporal rotators onto a respective subset of output links of said set of output links so that each output link comprises an output spectral band from each temporal rotator of said each temporal-rotator group.2. The method of wherein said directing comprises employing a respective spectral demultiplexer for said each input link.3. The method of wherein said combining comprises employing a respective spectral multiplexer for said each input link.4. The method of further comprising:arranging said plurality of input links into input-link groups; andselecting said respective temporal rotator so that each temporal rotator of said plurality of temporal rotators receives a spectral band from input links of one input-link group.5. The method of further comprising ...

OPTOELECTRONIC SWITCH

A switch module and optoelectronic switch incorporating the same. The optoelectronic switch includes an N-dimensional array of switch modules arranged in a topology in which each switch module is a member of N sub-arrays, the sub-arrays defined with reference to the coordinates of the constituent switch modules, and wherein all of the members of each sub-array are connected by an active switch, which in some embodiments may be an optical active switch or an electronic active switch. 124-. (canceled)25. A switch module , for use in an optoelectronic switch , the switch module having:a client portion for connecting to an input device or an output device; anda first fabric portion having a transmission side and a receiving side, a transmission side input;', 'a transmission side packet processor configured to receive, at the transmission side input, a first electronic signal, and to produce, at a plurality of outputs of the transmission side packet processor, a plurality of respective first electronic component signals;', 'a plurality of transmission side electrical to optical converters for converting each of the first electronic component signals into a respective optical signal of a first plurality of optical signals;', 'a transmission side multiplexer for converting the first plurality of optical signals into a multiplexed fabric output signal, and, 'the transmission side having a receiving side demultiplexer for receiving a multiplexed fabric input signal and separating said multiplexed fabric input signal into a second plurality of optical signals;', 'a plurality of receiving side optical to electrical converters for converting each of the second plurality of optical signals into a respective second electronic component signal of a plurality of respective second electronic component signals;', 'a receiving side output; and', 'a receiving side packet processor configured to receive, at respective inputs of the receiving side packet processor, the second electronic ...

CONTROL PLANE FOR AN OPTICAL NETWORK FOR TRANSMITTING MULTI-CARRIER DATA BURSTS WITH DYNAMIC ADAPTATION OF LEARNING SEQUENCE

A system for sending data in an optical network comprising a plurality of source nodes and destination nodes is disclosed. In one aspect, a source node generates, in a spectral band that is associated with it, a multi-carrier optical data signal obtained by modulation of a source signal at a source wavelength and sends it in the form of single-band data bursts that can be associated with distinct source wavelengths. A single-band data burst comprises, in addition to payload data symbols (PL), a sequence of learning symbols (TS) composed of a plurality of learning symbols. A control unit belonging to the control plane of the optical network determines, for at least one of the source nodes, instants of sending of the single-band data bursts and source wavelengths to be used for sending these single-band data bursts, as a function of a path time of the data bursts between the source node and one of the destination nodes associated with the source wavelength. The control unit also determines the size of the sequence of learning symbols (TS) of the single-band data bursts. 115.-. (canceled)16. A system for sending data in an optical network comprising a plurality of source nodes (Nd_S) and destination nodes (Nd_D) , the system comprising:a source node (Nd_S) configured to generate a multi-carrier optical data signal obtained by modulation of a source signal at a source wavelength and sending the multi-carrier optical data signal in the form of single-band data bursts that can be associated with distinct source wavelengths;a single-band data burst comprising, in addition to payload data symbols (PL), a sequence of learning symbols (TS) comprising a plurality of learning symbols; anda control unit (UC) belonging to the control plane of the optical network, being configured to determine, for at least one of the source nodes (Nd_S) instants of sending of the single-band data bursts and source wavelengths to be used for sending the single-band data bursts, as a function of a ...

Optical switching and routing system

The present invention provides a free space optical switching and routing system utilizing a switchable grating based approach together with novel noise suppression techniques. This family of devices provides for an optical switching and routing system that is useful for interconnecting any of an input array's optical channels to any of an output array's optical channels. The incorporation of free space switched grating based routing in the present invention has several distinct advantages including compactness, a reduction in insertion loss and the number of required switching devices and control signals, and improvements in switch isolation, noise and crosstalk suppression, spurious reflections, data skew, and compactness.

Optical CDMA communications system using OTDC device

An optical code division multiple access communication system using a processor processes at least one collimated input beam which has been modulated with a data signal to produce multiple time-delayed output beams. The multiple time-delayed output beams are spatially distributed and independently phase shifted. An integration lens receives the phase modulated output beams and reintegrates the phase modulated output beams into a single encoded beam with a time series chip sequence. The integrated encoded beam is transmitted. A receiving system includes a processor to process the encoded collimated light beams received from a transmitter to produce multiple time-delayed output beams. The multiple time-delayed output beams are spatially distributed and independently phase shifted. An integration lens receives the phase-shifted output beams and reintegrates the phase-shifted output beams into a single decoded beam.

Optical cross-connect device and system having the device

WAVELENGTH-SELECTIVE OPTICAL DELAY LINE

CONTROL PLANE FOR AN OPTICAL NETWORK FOR TRANSMITTING DYNAMIC ADAPTATION DATA MULTIPLE CARRIER BURSTS OF LEARNING SEQUENCE.

L'invention concerne un système d'émission de données dans un réseau optique comprenant une pluralité de nœuds sources et de nœuds destinataires. Un nœud source génère, dans une bande spectrale qui lui est associée, un signal optique multi-porteuses de données obtenu par modulation d'un signal source à une longueur d'onde source et l'émet sous forme de rafales de données mono-bande pouvant être associées à des longueurs d'onde source distinctes. Une rafale de données mono-bande comprend, outre des symboles de données utiles (PL), une séquence de symboles d'apprentissage (TS) composée d'une pluralité de symboles d'apprentissage. Une unité de contrôle, appartenant au plan de commande du réseau optique, détermine, pour l'un au moins des nœuds sources, des instants d'émission des rafales de données mono-bande et des longueurs d'onde sources à utiliser pour l'émission de ces rafales de données mono-bande, en fonction d'un temps de trajet des rafales de données entre le nœud source et l'un des nœuds destinataires, associé à la longueur d'onde source. Selon l'invention, l'unité de contrôle détermine également une taille de la séquence de symboles d'apprentissage (TS) des rafales de données mono-bande. The invention relates to a data transmission system in an optical network comprising a plurality of source nodes and destination nodes. A source node generates, in a spectral band associated with it, a multi-carrier optical signal of data obtained by modulating a source signal at a source wavelength and transmits it in the form of single-band data bursts. can be associated with different source wavelengths. A single-band data burst includes, in addition to useful data symbols (PL), a training symbol sequence (TS) composed of a plurality of learning symbols. A control unit, belonging to the control plane of the optical network, determines, for at least one of the source nodes, times of transmission of ...

OPTICAL DIGITAL TRANSMISSION FOR MULTIFUNCTION BREWING, ROUTING AND SWITCHING

Transmission numérique optique pour le brassage, le routage et la commutation multifaisceaux.L'invention concerne un dispositif de transmission numérique optique qui permet le brassage, le routage et la commutation au niveau temporel, spatial et fréquentiel d'un certain nombre de faisceaux électromagnétiques. Le dispositif utilise, p.ex. comme source lumineuse un certain nombre de lasers de faible / moyenne puissance, couplés à un certain nombre de têtes matricielles optiques et de lignes à retard spécifiques de type guide d'onde structuré à base, p.ex. de fibre optique, de structure cristalline naturelle ou de synthèse spécifique, de mémoire passive/active optique, ou de toute combinaison de ces derniers.La fonction de brassage, routage et commutation multifaisceaux électromagnétiques de type optique ou non en autorise l'utilisation dans différents domaines d'applications en télécommunication (p.ex. transmission point à point, point à multipoints, en espace libre...). The invention relates to an optical digital transmission device that allows the intermixing, routing and switching of a number of electromagnetic beams at the temporal, spatial and frequency levels. The device uses, for example as a light source, a number of low / medium power lasers, coupled to a number of optical matrix heads and specific waveguide-type delay lines, eg of optical fiber, of natural crystalline structure or of specific synthesis, of optical passive / active memory, or of any combination thereof.The optical or non-optical electromagnetic multibeam stirring, routing and switching function allows it to be used in different areas of telecommunication applications (eg point-to-point, point-to-multipoint, free-space ...).

OPTICAL DIGITAL TRANSMISSION FOR MULTIFUNCTION BREWING, ROUTING AND SWITCHING

Synchronization system for all optical slotted ring dynamic networks

다수의 노드들(0-3)을 구비하는 통신망에 걸쳐 데이터를 통신하기 위한 방법에 관한 것이다. 상기 다수의 노드들(0-3) 중에서 하나의 노드(0-3)로부터 상기 다수의 노드들 중 다른 노드들로 타임 슬롯 클록 신호가 전송된다. 상기 다수의 노드들 중 다른 노드들 각각이 타임 슬롯 클록 신호를 수신한 후에, 상기 타임 슬롯 클록 신호가 재계산되어 통신망상에서 정수개의 슬롯들을 획득한다. 다수의 노드들(0-3) 중 하나의 노드로부터 상기 다수의 노드들 중 다른 노드들로 재계산된 타임 슬롯 클록 신호가 전송된다. A method for communicating data across a communication network having a plurality of nodes (0-3). A time slot clock signal is transmitted from one of the plurality of nodes 0-3 to another of the plurality of nodes. After each of the other nodes of the plurality of nodes receives a time slot clock signal, the time slot clock signal is recalculated to obtain an integer number of slots on the communication network. A recalculated time slot clock signal is sent from one of the plurality of nodes 0-3 to the other of the plurality of nodes.

Large capacity optical atm switch

본 발명은 광 비동기전송모드(ATM:Asynchronous Transfer Mode) 스위치의 처리용량의 한계를 극복함은 물론 대용량의 스위칭을 수행할 수 있도록 한 대용량 광 비동기전송모드 스위치에 관한 것으로, The present invention relates to a large-capacity optical asynchronous transfer mode switch capable of performing a large-capacity switching as well as overcoming the limitation of the processing capacity of an Asynchronous Transfer Mode (ATM) switch. 본 발명은 스위치의 각 입력단인 전송링크를 통해서 파장다중화된 광채널을 역다중화시켜 각 채널로 경로배정을 위한 1차 파장으로 변환시키고 셀들 간의 충돌을 막기 위해 압축하여 시분할 다중화시키는 파장분할다중화/시분할다중화변환모듈과, 상기 파장분할다중화/시분할다중화변환모듈에서 1차 파장변환된 각 셀을 1 차 목적지로 경로 배정하는 제 1 경로배정기와, 상기 제 1 경로배정기에서 배정된 채널 신호를 역다중화하여 원래의 신호형태로 역압축을 한 뒤 최종 목적지로 경로 배정되기 위한 파장으로 변환시켜 다시 셀 충돌을 막기위하여 압축하는 시분할다중화/파장분할다중화 스위칭모듈과, 상기 시분할다중화/파장분할다중화 스위칭모듈에서 역압축한 신호를 최종목적지로 셀들을 경로 배정하는 제 2 경로배정기로 구성됨을 특징으로 한다. The present invention demultiplexes a wavelength multiplexed optical channel through a transmission link as an input terminal of a switch, converts the wavelength-multiplexed optical channel into a primary wavelength for routing, and compresses and time-division multiplexes to prevent collisions between cells. A first path divider for routing each cell of the first wavelength conversion in the wavelength division multiplexing / time division multiplexing conversion module to a primary destination, and demultiplexing a channel signal assigned at the first path assigner A time division multiplexing / wavelength division multiplexing switching module that compresses to prevent cell collision by converting back compression into a signal for routing to a final destination after decompressing the signal in the form of a signal, and the reverse compression in the time division multiplexing / wavelength multiplexing switching module A second router that routes the cells to a destination as a signal. All.

Multiple petabit-per-second switching system employing latent switches

Access switches of moderate dimensions are interconnected through central switches of large dimensions to form a large-scale switching system. The central switches are configured as latent switches which scale easily to large dimensions. Each access switch has asymmetric connections to the ingress sides and egress sides of the central switches so that paths from an originating access switch to a destination access switch through the central switches are subject to staggered switching delays permitting an access controller of any access switch to select an available path of minimum switching delay for a given flow. Using access switches of 128 dual ports each and central switches of 4096 dual ports each, a switching system of 524288 dual ports is realized. At a port capacity of 10 Gigabits/second, the access capacity exceeds five petabits per second and the bulk of traffic experiences a switching delay below two microseconds.

Method for composite packet-switching over WDM by transparent photonic slot routing

A system for providing high connectivity communications over a composite packet-switched optical ring network comprises a plurality of nodes, each node further comprising, an optical crossbar switch connected to the packet-switched optical ring network, a rapidly tunable laser for serially generating a plurality of packets, each packet being generated at a different wavelength and a wavelength stacker for stacking the plurality of serially generated packets to form a composite packet.

Method for providing high connectivity communications over a packet-switched optical ring network using composite packets

A system for providing high connectivity communications over a packet-switched optical ring network comprises a core optical ring having at least one node, the node being coupled to a subtending system by an optical crossbar switch, a source for generating a set of packets, a stacker for forming a first composite packet from the set of serial packets, the stacker coupled to the optical crossbar switch, and the stacker further coupled to the source for generating the set of packets, the first composite packet being parallel packets in a single photonic time slot, the first composite packet to be added to the core optical ring in a vacant photonic time slot via the optical crossbar switch, a second composite packet propagating on the core optical ring destined to be dropped at the node for further distribution on the subtending system via the optical crossbar switch, an unstacker for serializing the second composite packet dropped at the node, the unstacker coupled to the optical crossbar switch and a detector for distributing the serialized packets to a further destination by the subtending system. The source for generating the set of packets may be generated, for example, serially by a tunable laser or may be generated, for example, in parallel by an array of lasers.

Method, topology and point of presence equipment for serving a plurality of users via a multiplex module

A number of users interface with a network via a multiplex module, on a communication path established between the multiplex module and a point of presence. Some users may be served by one or more first channels of the communication path while one or more remaining users may be served by one or more additional channels of the communication path. Users having a basic service level agreement may be served by the first channels while users having an extended service level agreement may be served by the one or more additional channels. Allocation of users to distinct channel types based on their service level agreements may apply at a primary point of presence or may apply at a redundant point of presence.

System and method for setting forward error correction of passive optical network using time division multiplexing

본 발명은 시분할 다중화 방식의 수동형 광가입자 망 내에서 광 선로 터미널로부터 광망 유닛으로 전송되는 하향 프레임에 대하여 하향 순방향 에러 정정 코드를 설정하는 시스템 및 방법에 관한 것이다. 본 발명에 따른 시분할 다중화 방식의 수동형 광 가입자망 하향 순방향 에러 정정 코드 설정 시스템은 하향 프레임이 포함하는 하향 FEC(Forward Error Correction) 지표를 변경하고, 하향 프레임이 포함하는 하향 FEC 지표 카운터를 설정하여 하향 프레임을 전송하는 광 선로 터미널 및 광 선로 터미널이 전송하는 하향 프레임을 수신하고, 하향 프레임이 포함하는 하향 FEC 지표 및 하향 FEC 지표 카운터의 검출 결과에 따라 자신의 FEC 설정을 광 선로 터미널의 FEC 설정과 동기화하는 광망 유닛을 포함하는 것을 특징으로 한다.

Fast optical switch

A fast optical switch is needed to realize an economical and scaleable optical-core network. In the disclosed optical switch, switching is effected by rapid wavelength conversion. Either channel switching, Time Division Multiplex (TDM) switching or both may be provided by the fast optical switch. The operation of the fast optical switch is enabled by a fast scheduler. The throughput of the optical switch may be increased through a process of bimodal pipelined connection-packing. An in-band exchange of control signals with external nodes may serve to minimize the control overhead. Such control signals may include time-locking signals and connection-requests. A modular structure may be configured to comprise several fast optical switches to yield a high-speed, high-capacity, fully-connected optical switch.

Data processing method, communication single board and device

Embodiments of the present invention provide a data processing method, a communications board and a device, which relate to the field of communications technologies and can reduce a transmission delay of a TDM service. The method includes: acquiring, by a first communications board, an optical channel data unit ODU data flow; performing, by the first communications board, slicing processing on the ODU data flow according to a fixed frame frequency, so as to obtain various slices, where each slice includes a section of continuous ODU data in the ODU data flow; separately encapsulating, by the first communications board, each slice into an Ethernet frame; and sending, by the first communications board, each Ethernet frame to a time division multiplexing TDM service switching module in an Ethernet switching chip, so that the TDM service switching module sends each Ethernet frame to a second communications board to which a destination MAC address carried in the Ethernet frame directs.

Method and equipment for buffering optical packets

The present invention refers to an optical buffer allowing long-duration queuing of optical packets wherein said optical buffer comprises: - an optical loop, the length of which is divided into a plurality of time slots, - a plurality of optical fibers having different delays and corresponding to the number of time slots of said optical loop wherein a first delay corresponds to the duration of a first time slot and wherein the subsequent delay corresponds to the sum of the duration of the previous delay with the duration of the next subsequent time slot.

Architecture, method and system of wdm-based photonic burst switched networks

The architecture, system and operation of intelligent photonic burst switched (PBS) network consist of edge nodes and switching nodes. The PBS edge node includes a flow classifier, flow manager, and ingress/egress PBS MAC layer components. The flow classifier classifies information received from outside the PBS network into forward equivalent classes. The flow manager determines whether the information is to be sent over the PBS network or some other destination supported by the PBS edge node. Information to be sent over the PBS network is processed by the ingress PBS MAC layer component, which assembles the information into data bursts, schedules the transmission of the data burst, builds a control burst, and frames the data and control bursts, which are to be optically transmitted over the PBS network. The egress PBS MAC layer component receives control bursts and the corresponding data bursts, de-frames the data bursts, and appropriately assembles the data. The data is then classified and transmitted to the intended destination.

Optical Telecommunications Network

An optical telecommunication system includes a number of transparent passive optical networks (TONs). Each TON connects a group of terminals and the head end of each TON is connected to a common central switching node. Each terminal includes means for selecting a wavelength/time channel for forming a connection with another terminal within the respective TON or within another TON. The central switching node comprises an optical spatial/wavelength switch arranged to provide switched connections between subscribers connected to different TONs.

Photonic communication system with "sub-line rate" bandwidth granularity, protocol transparency and deterministic mesh connectivity

The system and method are used for transparently transporting a multiplicity of data formats (TDM, frame, packet, cell, etc.) and bit rates in a deterministic manner over an optical telecommunications network facilitates purely photonic aggregation, separation and switching of granular, sub-wavelength capacity of bandwidths less than the line rate capacity. The sub-rate of the optical transport on a given optical frequency between network edge components uses time-slot based TDM channels that can be optically bursted across different wavelengths using wavelength hopping to allow all-optical switching of the channels between different signal paths in the optical switch nodes, on a time-slot-by-time slot basis using WDM to reduce the probability of blocked connections. The connection management of these wavelength hopping optical TDM burst, (referred to as waveslots herein) is done using a connection protocol that employs conventional “least cost” path calculation algorithms to identify target connection routing through the optical network. A path integrity process ensures capacity, link removal and recalculation in cases of blocked connections. The time slot and wavelength map can be represented as a two dimensional matrix. Availability calculations can be done using simple matrix logic operations. The capability of the network to reconfigure and rearrange itself is maximized by the use of wavelength hopping. A full optical connection oriented bandwidth mechanism for management of that granular capacity is provided.

DYNAMIC METHOD OF INSERTING DATA TO NODES OF AN OPTICAL TRANSMISSION NETWORK

Méthode dynamique d'insertion de données aux noeuds d'un réseau de transmission par fibres optiques comprenant au moins un noeud source, un noeud de destination et une pluralité de noeuds intermédiaires, les noeuds étant reliés par une liaison à fibres optiques. La méthode comprend les étapes consistant à générer la transmission d'une ressource optique dans le noeud source, la ressource comportant des parties contenant des paquets de données à destination du noeud de destination et des parties libres susceptibles d'être occupées par des paquets fournis par chacun des noeuds intermédiaires, à détecter, lorsque la trame transite par un noeud intermédiaire, si elle comprend des parties libres lorsque le noeud intermédiaire a au moins un paquet de données à transmettre, et à ajouter le paquet de données dans une partie libre de la trame lorsque la partie libre peut contenir le paquet de données. Dynamic method of inserting data at the nodes of an optical fiber transmission network comprising at least a source node, a destination node and a plurality of intermediate nodes, the nodes being connected by an optical fiber link. The method comprises the steps of generating the transmission of an optical resource in the source node, the resource comprising parts containing data packets intended for the destination node and free parts likely to be occupied by packets provided by each of the intermediate nodes, to detect, when the frame passes through an intermediate node, whether it includes free parts when the intermediate node has at least one data packet to transmit, and to add the data packet to a free part of the frame when the free part can contain the data packet.

OPTICAL MULTIPLE COMMUNICATION NETWORK

RING OPTICAL NETWORK HAVING FLOW-INDEPENDENT HOLES FILLING PROTOCOL

Une station de communication (4-i), pour un réseau WDM en anneau, est agencée pour insérer dans une fibre optique (2) des paquets de signaux optiques selon au moins une longueur d'onde et un sens communs avec au moins une autre station de communication. Cette station (4-i) comporte, d'une part, des moyens de détection optique (17) chargés d'observer dans la fibre optique (2) le trafic associé à la longueur d'onde commune afin de délivrer des signaux de détection représentatifs de l'absence dans la fibre optique (2) de paquet selon la longueur d'onde détectée pendant une durée supérieure à une durée seuil, et ii) des moyens de contrôle (11) agencés, en cas de réception d'un signal de détection associé à la longueur d'onde détectée et postérieur à la réception d'un signal de synchronisation, représentatif du début d'au moins une session d'émission de durée choisie associée à cette longueur d'onde détectée, de déterminer la durée restant avant la fin de la session en cours, puis d'ordonner l'insertion dans la fibre optique (2) d'un paquet en attente de transmission, selon la longueur d'onde détectée, lorsque la durée restant avant la fin de la session en cours est supérieure à la durée nécessaire à l'insertion dans la fibre du paquet en attente de transmission. A communication station (4-i), for a WDM ring network, is arranged to insert into an optical fiber (2) packets of optical signals according to at least one wavelength and one direction common with at least one other communication station. This station (4-i) comprises, on the one hand, optical detection means (17) responsible for observing in the optical fiber (2) the traffic associated with the common wavelength in order to deliver detection signals representative of the absence in the optical fiber (2) of a packet according to the wavelength detected for a duration greater than a threshold duration, and ii) control means (11) arranged, in the ...

Fast optical switch

A last optical switch is needed to realize an economical and scaleable optical-core network. In the disclosed optical switch, switching is effected by rapid wavelength conversion. Either channel switching, Time Division Multiplex (TDM) switching or both may be provided by the fast optical switch. The operation of the fast optical switch is enabled by a fast scheduler. The throughput of the optical switch may be increased through a process of bimodal pipelined connection-packing. An in-band exchange of control signals with external nodes may serve to minimize the control overhead. Such control signals may include time-locking signals and connection-requests. A modular structure may be configured to comprise several fast optical switches to yield a high-speed, high-capacity, fully-connected optical switch.

Systems and methods for performing optical line terminal (OLT) failover switches in optical networks

A system for performing failover switches in an optical network, such as a time and wavelength division passive optical networks (TWDM PON) like NG-PON2, includes a backup optical line terminal (OLT) for backing up communications of a primary OLT. The backup OLT is configured to allocate small upstream time slots, referred to herein as “de minimis” time slots, to at least one optical network terminal (ONT) communicating with the primary OLT during normal operation. When a failure occurs that prevents communication between the ONT and the primary OLT, the ONT autonomously tunes to the upstream and downstream wavelength pairs of the backup OLT and begins to transmit data to the backup OLT in the de minimis time slot allocated to it. The presence of data in the de minimis time slot indicates the occurrence of a failover switch to the backup OLT, and the backup OLT then begins to allocate time slots to this ONT, which is normally serviced by the primary OLT according to its normal TDM algorithm.

Switching methods with a plurality of time intervals

A time frame switching method and system of data units that utilize a common time reference, which is divided into a plurality of periodic time frames. The system is designed to operate with time frames, which have a plurality of predefined time durations. The plurality of data units that are contained in each of the time frames are switched through a switch fabric and then forwarded in a pipelined manner through the network. The switch fabric is implemented in various manners, such as, electronic cross connect and optical cross connect, wherein the optical cross connect can be a combination of at least one of the following: an optical cross-bar, an optical banyan network, a Lithium-Niobate optical switch, an Indium Phosphate optical switch, a 2-D MEMS optical switch, a 3-D MEMS optical switch, a semiconductor optical amplifier (SOA) based optical switch, an holographic optical switch, Bubble optical switch, plurality of tunable lasers, and plurality of optical stars. The system operates with high-speed wavelength division multiplexing (WDM) links, i.e., with multiple lambdas, having a plurality of transmission capacities. The outcome of this method is called fractional lambda switching with a plurality of time frame durations.

A multiservice optical switch

A time division multiplexed optical switching system switches a signal from an ingress port to an egress port. The system comprises an optical switching fabric, ingress and egress line cards and a switch control fabric. The optical switching fabric routes an optical signal from one of M ingress fibers to one of N egress fibers. The ingress line card is coupled between the ingress port and the optical switching fabric for receiving the signal at the ingress port. The ingress line card comprises a buffer for storing the ingress signal and transmits the signal to the optical switching fabric. The egress line card is coupled between the egress port and the optical switching fabric for receiving the optical signal from the egress fiber of the optical switching fabric. The egress line card comprises a buffer for storing the optical signal and transmits the signal to the egress port. The switch control fabric allots time slots to the ingress line card for transmitting to the optical switching fabric.

High capacity switching system

본 발명은 다수의 입력/출력 서브시스템들 및 상기 입력/출력 서브시스템들을 구성가능하게 상호 접속하는 중앙 상호 접속 수단을 포함하는, 전송 네트워크에서의 사용을 위한 고용량 스위칭 시스템을 제공한다. 상기 서브시스템들은 상기 네트워크의 송신 라인들로 및 그로부터 데이터 신호들을 수신 및 송신하기 위한 입력/출력 라인 모듈들, 상기 상호 접속 수단에 상기 서브시스템들을 접속하는 하나 이상의 링크 모듈들, 및 하나의 서브시스템들 내에서 상기 입력/출력 모듈들 및 상기 하나 이상의 링크 모듈들 사이에 시간 및 공간 도메인에서 데이터 신호들을 스위칭하는 로컬 스위칭 수단을 가진다. 상기 링크 모듈들은 동일한 입력/출력 서브시스템들의 상이한 입력/출력 라인 모듈들로부터 다른 상기 입력/출력 서브시스템들의 입력/출력 라인 모듈들로 향해진 데이터 신호들을 신호 버스트들로 총합하고 페이로드 갭을 각각의 신호 버스트에 부가하도록 적응된다. 상기 스위칭 시스템은 또한 상기 신호 버스트들을 그것들의 목적지 서브시스템들로 스위칭하기 위해 상기 페이로드 갭들 동안 상기 상호 접속 수단을 구성하는 스케줄러를 가진다. The present invention provides a high capacity switching system for use in a transmission network, comprising a plurality of input / output subsystems and central interconnection means configurably interconnecting the input / output subsystems. The subsystems include input / output line modules for receiving and transmitting data signals to and from transmission lines of the network, one or more link modules to connect the subsystems to the interconnection means, and one subsystem. And local switching means for switching data signals in the time and space domain between the input / output modules and the one or more link modules. The link modules aggregate data signals directed from different input / output line modules of the same input / output subsystems to input / output line modules of the other input / output subsystems into signal bursts and respectively close the payload gap. It is adapted to add to the signal burst of. The switching system also has a scheduler that configures the interconnection means during the payload gaps to switch the signal bursts to their destination subsystems.

Control plane for an optical network for transmitting multi-carrier data bursts with dynamic adaptation of learning sequence

Receiving device and optical switching network apparatus

The present invention provides a receiving device and an optical switching network apparatus. The receiving device comprises: multiple selection modules, quick optical switches separately connected to the selection modules, an output module connected to all the quick optical switches, and a receiver connected to the output module. The selection module is used for receiving a multi-wave optical signal, and selecting and filtering one segment of first optical signal within a preset time segment in the multi-wave optical signal, and sending the first optical signal to the quick optical switch. The quick optical switch is used for selecting a second optical signal from first optical signal filtered by the selection module, and transmitting the second optical signal to the output module. The output module is used for merging the optical signals selected by all quick optical switches into one path of optical burst signal, and sending the optical burst signal to the receiver. The receiver is used for performing optical-to-electrical conversion on the optical burst signal and extracting service data of an electric signal. By using the optical switching network apparatus comprising receiving device, the problem in the prior art can be solved that the capacity of an optical switching matrix is small or the switching speed cannot meet requirements.

Optical reservation-based network switch fabrics

A method of communicating data over a network having a plurality of nodes (0-3) thereupon is disclosed. The method includes reservin bandwidth for each node (2) of the plurality of nodes (0-3), where the data includes a destination address on the network for the data. The method also includes allocating the received data on a wavelength (Lamada 2) associated with a destination node (2) at the associated wavelength (Lamada 2). The destination node is determined based on the destination address.

High-capacity packet-switched ring network

A packet-switched WDMA ring network has an architecture utilizing packet stacking and unstacking for enabling nodes to access the entire link capacity by transmitting and receiving packets on available wavelengths. Packets are added and dropped from the ring by optical switches. A flexible credit-based MAC protocol along with an admission algorithm enhance the network throughput capacity.

Improvements in or relating to communication systems

A communication system for the mutual interconnection of a plurality of lower traffic level (5 Terabit) switch nodes via a relatively higher traffic level (Petabit) connection bus, which system comprises in operative association with each node, a two part TDM optical data management interface, wherein a first of the two parts comprises a time slot resequencer which serves to provide for the transmission of data from its associated node to the bus, and wherein a second of the two parts comprises a time slot specific combiner which serves for the transmission of data from the bus to its associated node, each node and the bus having independent data scheduling.

Optical telecommunications network

Optical TDM communication system

Polybox clustered optical network switching node, optical burst synchronization method and line frame

Optical network system, optical switch node, master node, and node

Protocol for native service transport over point-to-multipoint passive optical networks

A method for information transfer allowing for native transfer of voice, data, and any other digital service information over a passive optical network, comprising; the LT transmitting downstream in serially ordered frames broadcast to all of the NT's at a fixed interval; the NT's transmitting upstream in serially ordered frames, said frames being divided into serially ordered time slots, at most one NT transmitting information for at most one service type in each slot; the LT and the NT's exchanging management information, and the LT and the NT's natively transporting service information to each other in both the upstream and downstream directions, according to said management information exchanged between the LT and the NT's.

Optical network system, optical switch node, master node, and node

An optical network system includes a master node (101A) and a plurality of optical switch nodes (101 B to 101 D), allowing the number of nodes without depending on the number of wavelengths. The master node (101A) is configured to: divide a wavelength path having an arbitrary wavelength into time slots each having a predetermined time period; and allocate the time slots to each of the optical switch nodes (101 B to 101 D). Each of the optical switch nodes (101 B to 101 D) is configured to: synchronize the time slots based on information delivered from the master node (101A); and thereby transmit or receive a data or performs route switching.

High-capacity WDM-TDM packet switch

System and method for optical network

Optical digital transmission for multiple beam cross connection, routing and switching

本发明涉及光数字传输装置，用于在时间、空间和频率水平上的大量电磁波束的交叉连接、路由选择和交换。所述装置使用大量激光类型或其它低/中功率类型的电磁源，结合大量光学矩阵头部和结构化波导类型的特定延迟线，例如，基于天然晶体或特定合成结构、光无源或有源存储器、它们的任何组合的光纤。以光学方式的电磁多光束的交叉连接、路由选择和交换，否则它不能应用在电信的各个领域中(诸如，点对点，点对多点，自由空间传输)。