СПОСОБ И УСТРОЙСТВО ДЛЯ СНИЖЕНИЯ ПОМЕХ В ОПТИЧЕСКОЙ СИСТЕМЕ МДКР

ОПТИЧЕСКАЯ СИСТЕМА МДКР С ПРИМЕНЕНИЕМ ПОДДИАПАЗОННОГО КОДИРОВАНИЯ

VERFAHREN UND VORRICHTUNG ZUR DIGITALEN DATENÜBERTRAGUNG

VERFAHREN UND VORRICHTUNG ZUR DIGITALEN DATENÜBERTRAGUNG

INTERCCHANNEL TIME CODING PROCEDURE FOR MULTI-CANAL TRANSMISSION SYSTEMS

VARIABLE SPECTRAL PHASE ENCODER/DECODER BASED ON DECOMPOSITION OF HADAMARD CODES

The invention is directed toward a variable spectral phase encoder. The variable spectral phase encoder includes a plurality of switches and at least one encoder. The encoder is coupled between a first switch and second switch among the plurality of switches. The first switch selectively routes an optical signal to some combination of fixed encoders such that their collective product applies one of the Hadamard sequences to the optical signal.

APPARATUS AND METHOD FOR DIGITAL DATA TRANSMISSION

A method and apparatus for carrying out synchronous co-division multiple access (SCDMA) communication of multiple channels of digital data over a shared transmission media (1162). The system includes modems at remote units (1164) and a central unit (1160) to receive time division multiplexed digital data arranged into timeslots or channels and uses orthogonal codes to encode each channel of multiple data and spread the energy of each channel data over a frame of data transmitted in a code domain. Frames are synchronized as between remote (1164) and central units (1160) using a ranging scheme which is also useful in any other system transmitting data by frames in a distributed system where synchronizing the frames as between all units regardless of differences in propagation delays is necessary. Each frame in the SCDMA modulation scheme includes a gap or guardband containing no other data.

OPTICAL DEVICE FOR SIMULTANEOUSLY GENERATING AND PROCESSING OPTICAL CODES

The invention relates to an optical device, apt to generate and process optical codes at least one wavelength, comprising Pinputs s, with 1≤ s≤ P, and P≥ 1, and N outputs k, with 1≤ k≤ N and N≥ 1, characterised in that it is apt to simultaneously generate and process Nc≥ 2, made of C chips with time interval τ, with C≥ 2, characterised in that the transfer function Tsk (f) from the input s to the output k satisfies the following formula: where: Fv is a transfer function of an optical filter, for v=0,1…, V-1, av is a constant value, for v=0,1,…, V-1 Ssk is an integer number (Ssk ε Z), Nk is a constante value, for k=2,…N, and V is a positive integer number with 1≤V≤log2N. The invention further relates to a set of optical codes, apt to be generated, in particular, by such optical device, and to networks and apparatus comprising such optical device.

Lower overhead method for data transmission using ATM and SCDMA over hybrid fiber coax cable plant

A process for reducing the amount of overhead data in ATM cell headers prior to transmission both upstream and downstream on an HFC cable plant or other transmission media using SCDMA on at least the upstream path, without loss of either IP or Ethernet addressing information. A virtual link between each remote unit and a central unit is established using multiplexing to establish a virtual link to every remote unit. Downstream ATM cells are optimized by stripping off all but 2 bytes to leave a 50 byte cell. Incoming IP packets have their IP addressing information used to look up Ethernet domain address information for the RU and destination process to which this RU is coupled. An Ethernet header is appended to each IP packet as is RFC 1483 bytes to signal the start of the packet. The packet is parsed into 48 byte ATM cell payloads. VPI/VCI information for the virtual link of the remote unit to which the packet is bound is looked up using the Ethernet address information. The last cell in ...

PROCEDURE AND DEVICE FOR THE DIGITAL DATA COMMUNICATION

Method and apparatus for reduced interference in optical cdma

MULTI-WAVELENGTH OPTICAL CDMA WITH DIFFERENTIAL ENCODING AND BIPOLAR DIFFERENTIAL DETECTION

The present invention relates generally to an optical CDMA transmission system and method employing differential optical encoding and bipolar decoding. Differential encoding and bipolar decoding may be performed at the bit level, wherein differential phase encoding and decoding occurs on an entire composite signal. Differential encoding and bipolar decoding may also be performed at the chip level, wherein differential phase encoding and decoding occurs on individual spectral components of a given signal.

FORWARD/INVERSE DISCRETE FOURIER TRANSFORM APPARATUS FOR OPTICAL OFDM COMMUNICATION, A TRANSFORMING METHOD THEREOF, AND A TRANSCEIVER HAVING THE SAME, PERFORMING OPTICAL TRANSMISSION AT HIGH SPEED ABOVE THE SPEED LIMIT OF AN OPTICAL ELECTRONIC DEVICE

PURPOSE: A forward/inverse discrete Fourier transform apparatus for optical OFDM communication, a transmitting method thereof, and a transceiver having the same are provided to obtain spectral efficiency by optically generating an optical OFDM symbol in a transmitting terminal and performing de-multiplexing in a receiving terminal. CONSTITUTION: A 1:N splitter(100a) divides each subcarrier signal transmitted from the N input units corresponding to the optical frequency number of the subcarrier. A phase shift delay array module(200) performs the phase shift of the signals divided from the 1:N splitter. The N:1 power couplers of N reversely divides the signals outputted from the phase shift delay array module. A time delay array module(400) delays the time of the reversely divided optical OFDM symbol from the N:1 power coupler. The N:1 power coupler reversely divides the signals outputted from the time delay array module. The N:1 power coupler reversely divides the signals outputted from ...

MULTI-WAVELENGTH OPTICAL CDMA WITH DIFFERENTIAL ENCODING AND BIPOLAR DIFFERENTIAL DETECTION

The present invention relates generally to an optical CDMA transmission system and method employing differential optical encoding and bipolar decoding. Differential encoding and bipolar decoding may be performed at the bit level, wherein differential phase encoding and decoding occurs on an entire composite signal. Differential encoding and bipolar decoding may also be performed at the chip level, wherein differential phase encoding and decoding occurs on individual spectral components of a given signal.

Apparatus and method for scdma digital data transmission using orthogonal codes and head end modem with no tracking loops

A system for bidirectional communication of digital data between a central unit and a remote unit wherein the need for tracking loops in the central unit has been eliminated. The central unit transmitter generates a master carrier and a master clock signal which are used to transmit downstream data to the remote units. The remote units recover the master carrier and master clock and synchronize local oscillators in each remote unit to these master carrier and master clock signals to generate reference carrier and clock signals for use by the remote unit receiver. These reference carrier and clock signals are also used by the remote unit transmitters to transmit upstream data to the central unit. The central unit receiver detects the phase difference between the reference carrier and clock signals from the remote units periodically and adjusts the phase of the master carrier and master clock signals for use by the central unit receiver to receive the upstream data.

HIGH RESOLUTION DIGITAL OPTICAL ENCODER/DECODER

OPTICAL COMMUNICATION SYSTEM USING OPTICAL FREQUENCY CODE, OPTICAL TRANSMISSION DEVICE AND OPTICAL RECEPTION DEVICE THEREOF, AND REFLECTION TYPE OPTICAL COMMUNICATION DEVICE

Optical cdma system

OPTICAL CDMA SYSTEM USING SUB-BAND CODING

An optical fiber communications system uses spread spectrum code division multiple access techniques to achieve better bandwidth utilization. A transmitting user in the system encodes the optical signal using a first coding mask, and a receiving user decodes the received signal using two decoding masks, all of the masks having lengths N. The first mask is divided into two sections of lengths N/2 each, one of the sections defining a first sub-code of length N/2, while the other section blocks light. Each of the second and third masks is also divided into two sections, which correspond t o the two sections of the first mask. The section of the second mask corresponding to the coded section of the first mask has a second code that is identical to the first code, and the section of the second mask correspondin g to the blocked section of the first mask is also blocked. The section of the third mask corresponding to coded section of the first mask has a third code that is complementary to the first code, and the section of the third mask corresponding to the blocked section of the first mask is also blocked. Some users on the system have masks in which the first of the two sections are blocked and the second of the two sections are coded, while other users have masks in which the second of the two sections are blocked and the first of t he two sections are coded. The first codes used to code the encoding masks are selected from a set of unipolar codes that are derived from a set of balance d bipolar orthogonal codes.

SYSTEM AND METHOD FOR OCDMA-BASED PHOTONIC LAYER SECURITY ROBUSTNESS TO ARCHIVAL ATTACK

A system and method for transporting encrypted data having a transmitter and a receiver is provided. The transmitter generates a sequence of optical pulses, which are copied and output as identical channels. The identical channels are modulated by a plurality of modulators using data to generate a modulated data signal. Respective spectral phase encoders coupled to each of the plurality of data modulators encode respective modulated data signals using a plurality of mutually orthogonal phase codes that are individually associated with the respective spectral phase encoder. These encoded data signals are combined and code-scrambling by a spectral phase scrambler t using a scramble code as an encryption key to generate an encrypted signal. A receiver reverses the encryption to extract the data.

CODE GROUPING FOR OPTICAL NETWORKS

The invention is directed to code labeling in an optical network. The net work includes a transmitting station operable to transmit an optical signal. The network also includes an encoder coupled to the transmitting station op erable to label the optical signal composed of a group of codes. A receiving station operable to receive the labeled group of optical codes is also prov ided. The receiving station is operable to read the optical signal if the la bel of the received group of codes corresponds to the group of codes assigne d to the receiving station.

Optical communication system, optical transmitter, optical receiver and methods, and correlators used therefor

A complex orthogonal code in the present invention is one in which each row of a square matrix of N rows and N columns in which an element of an mth row and nth column is exp[2pij(m-1)(n-1)/N] (where j is an imaginary unit) is adopted as a code word. An optical orthogonal code for Optical Code Division Multiplexing/Optical Code Division Multiple Access (OCDM/OCDMA) is realized by a train of N-number of optical pulses corresponding to the argument (phase) of the code elements. An optical transmitter or optical receiver includes an optical correlator provided with a sampled Bragg grating having a plurality of Bragg gratings disposed serially at regular intervals inside an optical waveguide. The optical correlator is allocated any one of the code words. In the optical transmitter, an optical signal to be transmitted is encoded by the optical correlator. In the receiver, a received optical signal is decoded by the optical correlator. A high autocorrelation output is obtained only in a case ...

Phase-encoded optical code division multiple access

A system and method for performing phase-encoded optical Code Division Multiple Access (CDMA). A transmitter encodes digital data onto a wavelength of an optical signal using a codeword, splits the optical signal into a plurality of beams having separated frequency components, selectively phase-shifts the beams in accordance with the codeword, recombines the beams into the optical signal, and transmits the optical signal. The receiver receives the optical signal, splits the optical signal into a plurality of beams having separated frequency components, selectively phase-shifts the beams in accordance with the codeword, recombining the beams into the optical signal, and decodes the digital data from a wavelength of the optical signal using the codeword.

Passive optical network employing multi-carrier code division multiple access

A passive optical network (PON) for providing a large amount of data at high speed to subscribers is provided. In particular, a PON employing a multi-carrier CDMA in which a CDMA method is applied for an upstream signal is provided. The PON employing a multi-carrier CDMA includes: optical network terminals (ONTs) for transmitting CDMA-based data using multiple carriers to an optical line terminal (OLT) and for receiving Ethernet-based data transmitted from the OLT; the OLT for transforming CDMA-based data received from the ONT into Ethernet-based data, for transmitting the Ethernet-based data to a higher network, and for transmitting Ethernet-based date to the ONTs; and an optical coupler for coupling CDMA-based optical signals transmitted from the ONTs, for transmitting the coupled optical signal to the OLT, and for distributing an Ethernet-based optical signal transmitted from the OLT to the ONTs.

Method of allocating upstream bandwidth resource and method of transmitting upstream data in orthogonal frequency division multiple access-open optical subscriber network

There are provided a method of allocating upstream bandwidth resources and a method of transmitting upstream data in an orthogonal frequency division multiple access-open optical subscriber network. The method of allocating an upstream bandwidth resource according to an embodiment of the invention includes receiving queue status information from each optical network unit (ONU), and allocating an upstream bandwidth by providing to each ONU a 2-D upstream bandwidth map on a subcarrier-time resource through a frame synchronized at constant cycles, based on the queue status information received from each ONU.

Apparatus and method for digital data transmission

A method and apparatus for carrying out synchronous co-division multiple access (SCDMA) communication of multiple channels of digital data over a shared transmission media (1162). The system includes modems at remote units (1164) and a central unit (1160) to receive time division multiplexed digital data arranged into timeslots or channels and uses orthogonal codes to encode each channel of multiple data and spread the energy of each channel data over a frame of data transmitted in a code domain. Frames are synchronized as between remote (1164) and central units (1160) using a ranging scheme which is also useful in any other system transmitting data by frames in a distributed system where synchronizing the frames as between all units regardless of differences in propagation delays is necessary. Each frame in the SCDMA modulation scheme includes a gap or guardband containing no other data.

Apparatus and method for digital data transmission

A method and apparatus for carrying out synchronous co-division multiple access (SCDMA) communication of multiple channels of digital data over a shared transmission media (1162). The system includes modems at remote units (1164) and a central unit (1160) to receive time division multiplexed digital data arranged into timeslots or channels and uses orthogonal codes to encode each channel of multiple data and spread the energy of each channel data over a frame of data transmitted in a code domain. Frames are synchronized as between remote (1164) and central units (1160) using a ranging scheme which is also useful in any other system transmitting data by frames in a distributed system where synchronizing the frames as between all units regardless of differences in propagation delays is necessary. Each frame in the SCDMA modulation scheme includes a gap or guardband containing no other data.

CODE GROUPING FOR OPTICAL NETWORKS

The invention is directed to code labeling in an optical network. The network includes a transmitting station operable to transmit an optical signal. The network also includes an encoder coupled to the transmitting station operable to label the optical signal composed of a group of codes. A receiving station operable to receive the labeled group of optical codes is also provided. The receiving station is operable to read the optical signal if the label of the received group of codes corresponds to the group of codes assigned to the receiving station.

ALL OPTICAL FORWARD/INVERSE DISCRETE FOURIER TRANSFORM APPARATUS AND METHOD FOR OPTICAL OFDM TRANSMISSION AND TRANSCEIVER HAVING THE SAME

光学CDMAにおいて干渉を減少する方法および装置

... 【解決手段】 複数のユーザによる光ファイバ通信システムはよりよい帯域幅利用を達成するためにスペクトラム拡散コード分割多重アクセス技術を使用する。システムの各チャンネルは、エンコーダによって一時的にスペクトル変調光源により供給される。変調は、パルスモディファイアーを通して縮小されたデューティーサイクルを備えた短縮パルスストリームを得るために最初にデータを渡して遂行される。変調された光は、ファイバにつながれる。そして、データはデコーダによって回復される。ソースは、類似ソースを複数生じるために階層方式において複数回分割され、増幅されるスーパー発光ファイバソースを含んでいる。同種のソースは異なるソースを遅延させることにより非相関にする。エンコーダの各々は、光学の信号をコード化する最初のコードがある暗号化マスクを含んでいる。マスクによって空間でコード化され、一時的に変調された光は、他のユーザ信号とのファイバリンク上に送信され、デコーダによって受信される。各デコーダでは、偏光無感覚なセパレーターが、信号解読のために使用される2つの復調マスクに供給される2つの等しいパワー要素へ受信光を分割する。マスクの1つは第1のコードと同一の別のコードを有し、別のマスクは第1のコードに相補的な第3のコードを有する。マスクによってろ過された出力光ビームは、出力信号(それはデータ回復のためにさらに処理される)を生成することで差異的に検知される。電気的信号はフィルターされ、電気的二乗法則が検知した低いパスである。第1コードは、平衡である双極の直角コードに由来した、1セットの単極のコードから選ばれる。コードはバイナリあるいはアナログどちらでも良い。 ...

Interkanal-Zeit-Codierungsverfahren für mehrkanalige Übertragungssysteme

Optical device for simultaneously generating and processing optical codes

OPTICAL CDMA SYSTEM USING SUB-BAND CODING

La présente invention concerne un système de communications par fibre optique multi-utilisateurs utilisant des techniques d'accès multiple par étalement du spectre afin de permettre une meilleure utilisation de largeur de bande. Un utilisateur émettant dans le système code le signal optique à l'aide d'un masque de premier codage, et un utilisateur en réception décode le signal reçu à l'aide de deux masques de décodage, tous les masques étant de longueur N. Le premier masque est divisé en deux sections de longueurs N/2 chacune, une des sections définissant un premier sous-code de longueur N/2, pendant que l'autre section bloque la lumière. Chacun des deuxième et troisième masques est aussi divisé en deux sections qui correspondent aux deux sections du premier masque. La section du deuxième masque, correspondant à la section codée du premier masque, possède un deuxième code qui est identique au premier code, et la section du deuxième masque, correspondant à la section bloquée du premier masque ...

Multiple channel control using orthogonally modulated coded drive signals

An orthogonal pilot tone servo controller provides a servo control loop for each tap in a delay line processor where each servo acquires its independence from the other tap's servos utilizing an orthogonal code set modulated on top of the existing tap values. The orthogonal codes are attenuated in amplitude such that the code sets are transparent to the processed signals of interest, but the code's length enables each tap's servo controller to independently recover the tap's state from the aggregate of signals and codes through processing gain realized in each loop's recovery circuit. A plurality of taps can be thus be servo controlled simultaneously, providing for extremely wide bandwidth processes which can be performed accurately with digital controls.

PHASE CHIP FREQUENCY-BINS OPTICAL CODE DIVISION MULTIPLE ACCESS

Apparatus and system for transmitting and receiving Optical code division multiple access data over an optical Network. The apparatus comprises a spectral phase decoder for Decoding the encoded optical signal to produce a decoded Signal, a time gate for temporally extracting a user signal From the decoded signal, and a demodulator that is operable to Extract user data from the user signal. The system preferably Comprises a source for generating a sequence of optical Pulses, each optical pulse comprising a plurality of spectral Lines uniformly spaced in frequency so as to define a Frequency bin, a data modulator associated with a subscriber And operable to modulate the sequence of pulses using Subscriber data to produce a modulated data signals and a Hadamard encoder associated with the data modulator and Operable to spectrally encode the modulated data signal to Produce an encoded data signal.

SYSTEM AND METHOD FOR OCDMA-BASED PHOTONIC LAYER SECURITY ROBUSTNESS TO ARCHIVAL ATTACK

A system and method for transporting encrypted data having a transmitter and a receiver is provided. The transmitter generates a sequence of optical pulses, which are copied and output as identical channels. The identical channels are modulated by a plurality of modulators using data to generate a modulated data signal. Respective spectral phase encoders coupled to each of the plurality of data modulators encode respective modulated data signals using a plurality of mutually orthogonal phase codes that are individually associated with the respective spectral phase encoder. These encoded data signals are combined and code-scrambling by a spectral phase scrambler t using a scramble code as an encryption key to generate an encrypted signal. A receiver reverses the encryption to extract the data.

APPARATUS AND METHOD FOR DIGITAL DATA TRANSMISSION

A method and apparatus for carrying out synchronous co-division multiple access (SCDMA) communication of multiple channels of digital data over a shared transmission media (1162). The system includes modems at remote units (1164) and a central unit (1160) to receive time division multiplexed digita l data arranged into timeslots or channels and uses orthogonal codes to encode each channel of multiple data and spread the energy of each channel data ove r a frame of data transmitted in a code domain. Frames are synchronized as between remote (1164) and central units (1160) using a ranging scheme which is also useful in any other system transmitting data by frames in a distributed system where synchronizing the frames as between all units regardless of differences in propagation delays is necessary. Each frame in the SCDMA modulation scheme includes a gap or guardband containing no other data. ...

CODE GROUPING FOR OPTICAL NETWORKS

The invention is directed to code labeling in an optical network. The network includes a transmitting station operable to transmit an optical signal. The network also includes an encoder coupled to the transmitting station operable to label the optical signal composed of a group of codes. A receiving station operable to receive the labeled group of optical codes is also provided. The receiving station is operable to read the optical signal if the label of the received group of codes corresponds to the group of codes assigned to the receiving station.

METHOD AND APPARATUS FOR REDUCED INTERFERENCE IN OPTICAL CDMA

La présente invention concerne un système de communications par fibre optique multi-utilisateurs utilisant des techniques d'accès multiple par étalement du spectre afin de permettre une meilleure utilisation de largeur de bande. Chaque voie du système est équipée d'une source de lumière temporellement et spectralement modulée à l'aide d'un codeur. La modulation s'accomplit en faisant d'abord passer les données via un modificateur d'impulsion afin d'obtenir un flux d'impulsions raccourcies avec un facteur de marche réduit. La lumière modulée est couplée à une fibre et les données sont récupérées par le décodeur. La source comprend une source de fibre superluminescente scindée de multiples fois et amplifiée d'une manière hiérarchique afin de produire une pluralité de sources semblables. L'adjonction de retard permet de décorréler ces sources semblables. Chacun des codeurs comprend un masque de codage présentant un premier code qui code le signal optique. La lumière, codée spatialement par ...

Method and system for alternative transmission traffic routing in dense wavelength division multiplexing optical networks

A system and method is disclosed for providing high-speed, high capacity data communication over a Wave Division Multiplexing (WDM) network with an efficient re-routing capability. When all light channels between two nodes in the network are loaded with transmission jobs, a transmission traffic congestion is created. In order to avoid or alleviate the congestion, a new alternative route is needed. An alternative route is selected to direct the traffic away from the congested route, and further expand the channel capacity of the alternative route by encoding the light channels in the alternative route with orthogonal codes.

SECURE KEY DISTRIBUTION FOR OPTICAL CODE DIVISION MULTIPLEXED BASED OPTICAL ENCRYPTION

An optical communications network incorporating photonic layer security, with secure key exchange without loss of data, and a method of operating the network are disclosed. The network comprises a transmit side and a receive side. The transmit side includes first and second scramblers and a transmit side switch; and the receive side includes first and second descramblers and a receive side switch. The scramblers use encryption keys to encrypt optical signals, and the descramblers use the encryption keys to decrypt the encrypted optical signals. The encryption keys can be updated randomly and at will by installing new encryption keys on the scramblers and descramblers, and the transmit side and receive side switches are synchronized so that all of the optical signals that are encrypted using a new or updated encryption key are decrypted using the same new or updated encryption key.

System and Method for OCDM-Based Photonic Layer Security Robustness to Archival Attack

A system and method for transporting encrypted data having a transmitter and a receiver is provided. The transmitter generates a sequence of optical pulses, which are copied and output as identical channels. The identical channels are modulated by a plurality of modulators using data to generate a modulated data signal. Respective spectral phase encoders coupled to each of the plurality of data modulators encode respective modulated data signals using a plurality of mutually orthogonal phase codes that are individually associated with the respective spectral phase encoder. These encoded data signals are combined and code-scrambling by a spectral phase scrambler t using a scramble code as an encryption key to generate an encrypted signal. A receiver reverses the encryption to extract the data.

VERFAHREN UND VORRICHTUNG ZUR DIGITALEN DATENÜBERTRAGUNG

Apparatus and method for digital data transmission

METHOD AND APPARATUS FOR REDUCED INTERFERENCE IN OPTICAL CDMA

A multi-user optical fiber communications system uses spread spectrum code division multiple access techniques to achieve better bandwidth utilization. Each channel of the system is provided with light source that is temporally and spectrally modulated by an encoder. Modulation is accomplished by first passing the data through a pulse modifier to obtain a stream of shortened pulses with a reduced duty cycle. The modulated light is coupled to a fiber and data are recovered by the decoder. The source includes a superluminescent fiber source that is split multiple times and amplified in a hierarchical manner to produce a plurality of like sources. The like sources are decorrelated by adding delays to the different sources. Each of the encoders includes an encoding mask having a first code that encodes the optical signal. Light, spatially encoded by the mask and temporally modulated with data, is transmitted over a fiber link with the signals of other users and received by a decoder. Within ...

MULTI-WAVELENGTH OPTICAL CDMA WITH DIFFERENTIAL ENCODING AND BIPOLAR DIFFERENTIAL DETECTION

The present invention relates generally to an optical CDMA transmission system and method employing differential optical encoding and bipolar decoding. Differential encoding and bipolar decoding may be performed at the bit level, wherein differential phase encoding and decoding occurs on an entire composite signal. Differential encoding and bipolar decoding may also be performed at the chip level, wherein differential phase encoding and decoding occurs on individual spectral components of a given signal.

Passive optical network employing multi-carrier code division multiple access

A passive optical network (PON) for providing a large amount of data at high speed to subscribers is provided. In particular, a PON employing a multi-carrier CDMA in which a CDMA method is applied for an upstream signal is provided. The PON employing a multi-carrier CDMA includes: optical network terminals (ONTs) for transmitting CDMA-based data using multiple carriers to an optical line terminal (OLT) and for receiving Ethernet-based data transmitted from the OLT; the OLT for transforming CDMA-based data received from the ONT into Ethernet-based data, for transmitting the Ethernet-based data to a higher network, and for transmitting Ethernet-based date to the ONTs; and an optical coupler for coupling CDMA-based optical signals transmitted from the ONTs, for transmitting the coupled optical signal to the OLT, and for distributing an Ethernet-based optical signal transmitted from the OLT to the ONTs.

Asymmetric orthogonal codes for optical communications

PHASE CHIP FREQUENCY-BINS OPTICAL CODE DIVISION MULTIPLE ACCESS

Apparatus and system for transmitting and receiving Optical code division multiple access data over an optical Network. The apparatus comprises a spectral phase decoder for Decoding the encoded optical signal to produce a decoded Signal, a time gate for temporally extracting a user signal From the decoded signal, and a demodulator that is operable to Extract user data from the user signal. The system preferably Comprises a source for generating a sequence of optical Pulses, each optical pulse comprising a plurality of spectral Lines uniformly spaced in frequency so as to define a Frequency bin, a data modulator associated with a subscriber And operable to modulate the sequence of pulses using Subscriber data to produce a modulated data signals and a Hadamard encoder associated with the data modulator and Operable to spectrally encode the modulated data signal to Produce an encoded data signal.

VARIABLE SPECTRAL PHASE ENCODER/DECODER BASED ON DECOMPOSITION OF HADAMARD CODES

The invention is directed toward a variable spectral phase encoder. The v ariable spectral phase encoder includes a plurality of switches and at least one encoder. The encoder is coupled between a first switch and second switc h among the plurality of switches. The first switch selectively routes an op tical signal to some combination of fixed encoders such that their collectiv e product applies one of the Hadamard sequences to the optical signal. ...

INTERFEROMETRIC ELEMENT, INTERFEROMETRIC N-STAGE TREE ELEMENT, AND METHOD OF PROCESSING A FIRST OPTICAL INPUT SIGNAL AND A SECOND OPTICAL INPUT SIGNAL SO AS TO PROVIDE A PLURALITY OF ORTHOGONAL OUTPUT SIGNALS

The invention relates to an interferometric element comprising a first interferometer of the Mach-Zehnder type and a second interferometer of the Mach-Zehnder type, said first interferometer comprising a first input coupling element and a first output coupling element, and said second interferometer comprising a second input coupling element and a second output coupling element, said input coupling elements being optically connected to the output coupling elements by means of transmission lines, such that for each of the output coupling elements at least one delayed transmission line from among the respective associated transmission lines is designed for providing a frequency-dependent phase shift that differs from the frequency-dependent phase shift of the or each of the other, non-delayed transmission lines connected to the relevant output coupling element, while at least one of the transmission lines in the interferometric element is designed for providing an additional, frequency-independent ...

Apparatus and method for digital data transmission over video cable using orthogonal cyclic codes

A method and apparatus for carrying out synchronous co-division multiple access (SCDMA,) communication of multiple channels of digital data over a shared transmission media such as a cable television system coaxial cable, a fiber optic or copper conductor telephone link, terrestial microwave, satellite link, local or wide area network, wireless including cellur network or some combination of these media using suitable interface circuitry. The system includes modems at remote units and a central unit to receive time division multiplexed digital data arranged into timeslots or channels and uses orthogonal codes to encode each channel of multiple data and spread the energy of each channel data over a frame of data transmitted in the code domain. Spreading the data this way makes the system less susceptible to impulse noise. Frames are synchronized as between remote and central units using a ranging scheme which is also useful in any other system transmitting data by frames in a distributed ...

Klimaanlage

Es wird eine Klimaanlage offenbart. Die Klimaanlage der vorliegenden Offenbarung umfasst: mehrere Inneneinheiten, die konfiguriert sind, um auf mehreren Etagen in einem Gebäude verteilt und installiert zu werden; eine Steuerung, die konfiguriert ist, um die mehreren Inneneinheiten zu überwachen und zu steuern; und eine Drahtloskommunikationseinheit, die konfiguriert ist, um durch die Steuerung, die mehreren Inneneinheiten und eine Außeneinheit unter Verwendung eines Drahtloskommunikationsverfahrens Daten zu übertragen und zu empfangen; wobei die Drahtloskommunikationseinheit einen Sender und einen Empfänger, die eine Sub-GHz-Bandfrequenz verwenden, aufweist, wobei der Sender umfasst: eine Erzeugungseinheit für einen optischen Orthogonalkode, die konfiguriert ist, um Quelldaten unter Verwendung eines optischen Orthogonalkodes erstzuverschlüsseln; und eine Erzeugungseinheit für ein chaotisches Schmalbandsignal, die konfiguriert ist, um zusätzlich unter Verwendung eines chaotischen Signals zu verschlüsseln, wobei die Daten durch die Erzeugungseinheit für einen optischen Orthogonalkode und die Erzeugungseinheit für ein chaotisches Schmalbandsignal sequentiell verschlüsselt und dann übertragen werden.

OPTISCHES KOMMUNIKATIONSSYSTEM MIT EINEM OPTISCHEN FREQUENZCODE, OPTISCHE SENDEEINRICHTUNG UND OPTISCHE EMPFANGSEINRICHTUNG DAFÜR UND OPTISCHE KOMMUNI

Optical cdma system using sub-band coding

Code-division, minimum-shift-keying optical multiplexing

Optical code-division multiplexing and demultiplexing (CDM) using orthogonal codes with minimum shift keying (MSK) waveforms allows more efficient use of the spectrum and greatly reduces cross-channel interference. Receiving multiple baseband data channels, a derivation mechanism converts the data signals into series of impulses. These impulses may be split into odd and even channels, each at half the original data rate, and transmitted to a plurality of Walsh filters configured to have an impulse response corresponding to one of a plurality of orthogonal MSK waveforms. Odd and even channels, encoded with MSK waveforms, may combine into an in-phase and quadrature channel, 90° out of phase. A laser output may be divided, phase shifted, and modulated with the in-phase and quadrature channels, which divisions are then combined into a single multiplexed output. Walsh filters may decode the incoming signal in order to reproduce the original baseband channels.

SYSTEM AND METHOD FOR OCDM-BASED PHOTONIC LAYER SECURITY ROBUSTNESS TO ARCHIVAL ATTACK

OPTICAL CDMA SYSTEM

An optical fiber communications system uses spread spectrum code division multiple access techniques to achieve better bandwidth utilization. A single encoding mask having a first code is used to encode the optical signal. Light, spatially encoded by the mask and temporally modulated with data, is transmitted over a fiber link and received by a decoder. A polarization insensitive separator splits the received light into two equal power components which are provided to two decoding masks used to decode the signal. One of the masks has a second code identical to the first code and the other mask has a third code complementary to the first code. The output light beams filtered by the masks are differentially detected to generate an output signal, which is further processed for data recovery. The electrical signal is low pass filtered and electrically square law detected. The first codes are selected from a set of unipolar codes derived from a set of balanced bipolar orthogonal codes. The codes ...

OPTICAL CDMA SYSTEM USING SUB-BAND CODING

La présente invention concerne un système de communications par fibre optique multi-utilisateurs utilisant des techniques d'accès multiple par étalement du spectre afin de permettre une meilleure utilisation de largeur de bande. Un utilisateur émettant dans le système code le signal optique à l'aide d'un masque de premier codage, et un utilisateur en réception décode le signal reçu à l'aide de deux masques de décodage, tous les masques étant de longueur N. Le premier masque est divisé en deux sections de longueurs N/2 chacune, une des sections définissant un premier sous-code de longueur N/2, pendant que l'autre section bloque la lumière. Chacun des deuxième et troisième masques est aussi divisé en deux sections qui correspondent aux deux sections du premier masque. La section du deuxième masque, correspondant à la section codée du premier masque, possède un deuxième code qui est identique au premier code, et la section du deuxième masque, correspondant à la section bloquée du premier masque ...

OFDM TRANSPONDER INTERFACE WITH VARIABLE BIT TRANSFER RATE IN OPTICAL COMMUNICATIONS SYSTEMS

OFDM (Orthogonal Frequency Division Multiplexing) has been proposed for processing signals over WDM channels in an optical network. The number of OFDM sub-carrier channels utilized in transmitting optical signals from a transmitting node to a remote is adapted to the quality of transmission in a WDM channel. Responsive to control signals from the remote node, the number of used sub-carrier channels is set to optimize optical performance of the WDM channel.

Code Grouping for Optical Networks

The invention is directed to code labeling in an optical network. The network includes a transmitting station operable to transmit an optical signal. The network also includes an encoder coupled to the transmitting station operable to label the optical signal composed of a group of codes. A receiving station operable to receive the labeled group of optical codes is also provided. The receiving station is operable to read the optical signal if the label of the received group of codes corresponds to the group of codes assigned to the receiving station.

Code cycle modulation in optical code division multiple access systems

An optical code division multiple access (OCDMA) system includes an optical transmitter system configured to transmit data from a plurality of users through a shared optical channel by encoding the data from each user with a spreading code assigned to that user. Each spreading code includes a unique sequence of T time chips along a time axis. The data from each user is representable by T symbols. The OCDMA system further includes an optical receiver system configured to demodulate the data from each user by correlating signals received from the transmitter system with the spreading code assigned to that user. When transmitting a data symbol for each user, the transmitter system selects one out of T distinct cyclic shifts of the spreading code assigned to that user, and transmits the selected cyclic shift of the assigned spreading code along the time axis.

Passive optical network employing multi-carrier code division multiple access

A passive optical network (PON) for providing a large amount of data at high speed to subscribers is provided. In particular, a PON employing a multi-carrier CDMA in which a CDMA method is applied for an upstream signal is provided. The PON employing a multi-carrier CDMA includes: optical network terminals (ONTs) for transmitting CDMA-based data using multiple carriers to an optical line terminal (OLT) and for receiving Ethernet-based data transmitted from the OLT; the OLT for transforming CDMA-based data received from the ONT into Ethernet-based data, for transmitting the Ethernet-based data to a higher network, and for transmitting Ethernet-based date to the ONTs; and an optical coupler for coupling CDMA-based optical signals transmitted from the ONTs, for transmitting the coupled optical signal to the OLT, and for distributing an Ethernet-based optical signal transmitted from the OLT to the ONTs.

Apparatus and method for digital data transmission

A method and apparatus for carrying out synchronous co-division multiple access (SCDMA) communication of multiple channels of digital data over a shared transmission media (1162). The system includes modems at remote units (1164) and a central unit (1160) to receive time division multiplexed digital data arranged into timeslots or channels and uses orthogonal codes to encode each channel of multiple data and spread the energy of each channel data over a frame of data transmitted in a code domain. Frames are synchronized as between remote (1164) and central units (1160) using a ranging scheme which is also useful in any other system transmitting data by frames in a distributed system where synchronizing the frames as between all units regardless of differences in propagation delays is necessary. Each frame in the SCDMA modulation scheme includes a gap or guardband containing no other data.

Construction method for optical orthogonal codes (OOC) with cross-correlation constraint of 2

本发明公开了一种互相关约束为2的光正交码的构造方法，包括以下步骤：根据需要构造的码字数量n和码重w，构造整数数列M及相应的整数对表N；根据所述整数数列M和整数对表N，按照预设填数规则构造互相关约束为2的光正交码码字传号差距离三角阵D及差距离对集合T；根据由所述传号差距离三角阵D构成的映射关系，构造互相关约束为2的光正交码码字。通过构造同一个传号差距离三角阵的元素不能重复出现的光正交码码字传号差距离三角阵D以及所有差距离对元素不能重复出现的差距离对集合T，可以有效构造互相关约束为2的光正交码码字；构造的码字数量多、码重数值大；能构造任意数量、任意码重的互相关约束为2的光正交码码字。

PHASE CHIP FREQUENCY-BINS OPTICAL CODE DIVISION MULTIPLE ACCESS

Apparatus and system for transmitting and receiving Optical code division multiple access data over an optical Network. The apparatus comprises a spectral phase decoder for Decoding the encoded optical signal to produce a decoded Signal, a time gate for temporally extracting a user signal From the decoded signal, and a demodulator that is operable to Extract user data from the user signal. The system preferably Comprises a source for generating a sequence of optical Pulses, each optical pulse comprising a plurality of spectral Lines uniformly spaced in frequency so as to define a Frequency bin, a data modulator associated with a subscriber And operable to modulate the sequence of pulses using Subscriber data to produce a modulated data signals and a Hadamard encoder associated with the data modulator and Operable to spectrally encode the modulated data signal to Produce an encoded data signal.

Optical communication system using optical frequency code, optical transmission device and optical reception device thereof, and reflection type optical communication device

The invention dispenses with calibration of the optical frequency of the light source and permits the use of many codes without increasing the transmission bandwidth used. Let the optical frequency width of the light source be represented by FSR and the code length of every code be represented by FSR, the codes are made to be orthogonal to each other. The optical intensity-frequency characteristic of an n-th optical code signal is set to Cn(f)=(1+cos(2pisf/FSR+rpi/2))/2 (where s is an integer in the range from 1 to maximum number of codes/2, and r=0 or 1) to provide orthogonality between the optical code signals. Alternatively, optical frequency chips are sequentially assigned to chip sequences forming the optical code signals, the optical frequency of each chip "1" is output, and a filter is provided with an optical filtering characteristic of a concatenated code which is a repeated continuation of, for example a second-order Hadamard code word (0101) or (0011), and light emitted from ...

Apparatus and method for digital data transmission

PASSIVE OPTICAL NETWORK OF CDMA METHOD USING MULTI-CARRIER, CAPABLE OF TRANSMITTING VOLUMINOUS DATA BY USING THE CDMA METHOD AS UPSTREAM TRANSMISSION METHOD

Code-division, minimum-shift-keying optical multiplexing

Optical code-division multiplexing and demultiplexing (CDM) using orthogonal codes with minimum shift keying (MSK) waveforms allows more efficient use of the spectrum and greatly reduces cross-channel interference. Receiving multiple baseband data channels, a derivation mechanism converts the data signals into series of impulses. These impulses may be split into odd and even channels, each at half the original data rate, and transmitted to a plurality of Walsh filters configured to have an impulse response corresponding to one of a plurality of orthogonal MSK waveforms. Odd and even channels, encoded with MSK waveforms, may combine into an in-phase and quadrature channel, 90° out of phase. A laser output may be divided, phase shifted, and modulated with the in-phase and quadrature channels, which divisions are then combined into a single multiplexed output. Walsh filters may decode the incoming signal in order to reproduce the original baseband channels.

Code grouping for optical networks

The invention is directed to code labeling in an optical network. The network includes a transmitting station operable to transmit an optical signal. The network also includes an encoder coupled to the transmitting station operable to label the optical signal composed of a group of codes. A receiving station operable to receive the labeled group of optical codes is also provided. The receiving station is operable to read the optical signal if the label of the received group of codes corresponds to the group of codes assigned to the receiving station.

PHASE CHIP FREQUENCY-BINS OPTICAL CODE DIVISION MULTIPLE ACCESS

Optical communication system using optical frequency code, optical transmission device and optical reception device thereof, and reflection type optical communication device

CDMA-PON by using Multi Carrier

SYSTEM AND METHOD FOR REDUCING OPTICAL BEATING INTERFERENCE BY USING DELAY LINE-BASED OPTICAL FILTERING

The present invention relates to technical concepts for reducing optical beating interference (OBI) generated upon multiple access uplink transmission in an optical communications system based on an intensity modulation/direct detection (IM/DD) scheme. According to one embodiment of the present invention, a system for reducing OBI comprises: an optical carrier processing unit configured to adjust the size of an optical carrier corresponding to optical communications network units, remaining except for a specific optical communications network unit, among a plurality of optical communications network units sharing an orthogonal frequency division multiplexing-based optical network, to be equal to or less than a threshold value; and a communications control unit configured to perform multiple access uplink transmission by using the optical carrier corresponding to the optical communications network units. COPYRIGHT KIPO 2017 ...

APPARATUS AND METHOD FOR DIGITAL DATA TRANSMISSION

Data transmission using atm over hybrid fiber coax

Communication system using wavelength spread-spectrum coding

Wavelength spread-spectrum coding enables a multi-channel communication systems to transmit more information signals than the number of transmission channels. At the transmitter, each information signal is encoded with a respective spreading code to generate a coded signal corresponding to each bit of the spreading code and the coded signals corresponding to the same bit of the spreading codes are allocated to a respective transmission channel. Then, in each transmission channel, the coded signals allocated thereto are analog summed to generate a modulation signal, and a transmission signal is modulated in response to the modulation signal. In the receiver, each information signal is recovered by multiplying the channel signal from each transmission channel by a respective bit of the spreading code assigned to the information signal to generate a respective product signal, summing the product signals to generate a sum signal, and subjecting the sum signal to thresholding.

OPTICAL COMMUNICATION SYSTEM, LIGHT TRANSMISSION DEVICE, LIGHT RECEPTION DEVICE AND METHOD, AND OPTICAL CORRELATION DEVICE

A complex orthogonal code uses as a code word, each row of a square matrix of N rows × N columns in which the element on the m-th row and the n-th column is exp (2πj(m-1) (n-1)/N) (j is an imaginary number unit). The optical orthogonal code for optical code division multiplex communication/optical code division multiplex connection (OCDM/OCDMA) is realized by N optical pulse columns corresponding to a deviation angle (phase) of the aforementioned code element. The light transmission device or the light reception device includes an optical correlation device equipped with a sampling Bragg grating having a plurality of Bragg gratings arranged in series at a predetermined interval in an optical waveguide. Any one of the code words is allocated to the optical correlation device. In the light transmission device, an optical signal to be transmitted is encoded by the optical correlation device. In the light reception device, a reception optical signal is decoded by the optical correlation device ...

OPTICAL TRANSMITTER, OPTICAL RECEIVER, AND OPTICAL TRANSMISSION METHOD

An optical transmitter, an optical receiver, and an optical transmission method are disclosed. The optical transmitter includes an optical signal generator, N spreaders, N pairs of data modulators, and a combiner, where the optical signal generator generates N optical carriers; an ith spreader spreads an ith optical carrier, to obtain a spread optical signal having two subcarriers; splits the spread optical signal into a first optical signal and a second optical signal; and delays the second optical signal to obtain a third optical signal; an ith pair of data modulators modulate the first optical signal and the third optical signal to obtain a pair of modulated optical signals, transmit the pair of modulated optical signals to the combiner, where the pair of modulated optical signals reaching the combiner differ by 1/(4 fsi) in time domain; and the combiner combines, into one optical signal, N pairs of modulated optical signals.

METHOD OF ALLOCATING UPSTREAM BANDWIDTH RESOURCE AND METHOD OF TRANSMITTING UPSTREAM DATA IN ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS-OPEN OPTICAL SUBSCRIBER NETWORK

There are provided a method of allocating upstream bandwidth resources and a method of transmitting upstream data in an orthogonal frequency division multiple access-open optical subscriber network. The method of allocating an upstream bandwidth resource according to an embodiment of the invention includes receiving queue status information from each optical network unit (ONU), and allocating an upstream bandwidth by providing to each ONU a 2-D upstream bandwidth map on a subcarrier-time resource through a frame synchronized at constant cycles, based on the queue status information received from each ONU.

Apparatus and method for digital data transmission over a CATV system using an ATM transport protocol and SCDMA

A method and apparatus for carrying an ATM communication protocol on a hybrid fiber coax CATV system. Point to point communication is supported by use of synchronous code division multiplexing on the physical and by assigning on the MAC layer one or more orthogonal SCDMA codes exclusively for use by pairs of devices needing to communicate such the head end and any customer premises equipment. Quality of service or guaranteed bandwidth availability is implemented by controlling the code space at the MAC layer such that certain CPEs having in use peripherals which cannot tolerate interruptions in data flow may reserve one or more SCDMA codes for use exclusively by them. Standard ATM cells are modified by the addition of a two byte virtual link header which identifies to which CPE a particular ATM packet is destined. This virtual header also makes possible broadcast and multicast of packets from the head end to all CPEs. Each byte in each ATM cell has 8 bits of data and a 9th bit which is ...

PHASE CHIP FREQUENCY-BINS OPTICAL CODE DIVISION MULTIPLE ACCESS

MULTI-WAVELENGTH OPTICAL CDMA WITH DIFFERENTIAL ENCODING AND BIPOLAR DIFFERENTIAL DETECTION

The present invention relates generally to an optical CDMA transmission system and method employing differential optical encoding and bipolar decoding. Differential encoding and bipolar decoding may be performed at the bit level, wherein differential phase encoding and decoding occurs on an entire composite signal. Differential encoding and bipolar decoding may also be performed at the chip level, wherein differential phase encoding and decoding occurs on individual spectral components of a given signal.

OPTICAL CONNECTION DEVICE AND OPTOELECTRONIC HYBRID APPARATUS INCLUDING THE SAME

An optical connection device includes: a substrate; an optical waveguide provided in the substrate; and plural optical connection ports provided in the optical waveguide and having at least one of a light output port and a light input port, the light output port outputting light to the optical waveguide, the light input port receiving light from the optical waveguide, and is characterized by further including an arithmetic circuit for, using a key, selectively decoding an optical signal which has been coded in such a manner that it is decoded only at a light input port that is given a key for decoding and which has been outputted from a light output port to the optical waveguide to be received at the light input port.

Construction method of strict related restraint light orthogonal signature graphic code

本发明公开了一种严格相关约束光正交签名图形码的构造方法，包括以下步骤：根据需要构造的严格相关约束光正交签名图形码码字数量n和码重w构造整数对表N；根据整数对表N，按照预设取数规则构造严格相关约束光正交签名图形码码字传号二维差距离三角阵D i (i＝1,2,…,n)；根据由传号二维差距离三角阵D i (i＝1,2,…,n)构成的映射关系，构造严格相关约束光正交签名图形码码字。通过构造传号二维差距离三角阵D i (i＝1,2,…,n)并按照映射关系构造严格相关约束光正交签名图形码码字，可以有效构造的严格相关约束光正交签名图形码码字数量多、码重数值大，可以构造出任意码重、任意数量的严格相关约束光正交签名图形码码字。

Code cycle modulation in optical code division multiple access systems

An optical code division multiple access (OCDMA) system includes an optical transmitter system configured to transmit data from a plurality of users through a shared optical channel by encoding the data from each user with a spreading code assigned to that user. Each spreading code includes a unique sequence of T time chips along a time axis. The data from each user is representable by T symbols. The OCDMA system further includes an optical receiver system configured to demodulate the data from each user by correlating signals received from the transmitter system with the spreading code assigned to that user. When transmitting a data symbol for each user, the transmitter system selects one out of T distinct cyclic shifts of the spreading code assigned to that user, and transmits the selected cyclic shift of the assigned spreading code along the time axis.

Variable Spectral Phase Encoder/Decoder Based on Decomposition of Hadamard Codes

The invention is directed toward a variable spectral phase encoder. The variable spectral phase encoder includes a plurality of switches and at least one encoder. The encoder is coupled between a first switch and second switch among the plurality of switches. The first switch selectively routes an optical signal to some combination of fixed encoders such that their collective product applies one of the Hadamard sequences to the optical signal.

サブバンドコーディングを使用した光学CDMAシステム

... 【解決手段】 光ファイバー通信システムは、効率良く帯域幅を利用するためにスプレッドスペクトル符号分割多重アクセス技術を使用する。システム内の転送ユーザーは、ファーストコーディングマスクを用いることによって光学シグナルを符号化する。また、受信ユーザーは2つのデコーディングマスクを用いることによって受信したシグナルを解読する。ここで、全てのマスクは長さNを有する。ファーストマスクは、それぞれN/2の長さを有する2つのセクションに分けられ、そのうちの一つは長さN/2の第一サブコードを定義づけ、他方は光をブロックする。さらに、セカンド及びサードマスクも、それぞれファーストマスクの2つのセクションに対応する2つのセクションに分けられる。ファーストマスクにおける符号化されたセクションに対応しているセカンドマスクのセクションは、セカンドコードを有している。このセカンドコードは、ファーストコードと同一であり、ファーストマスクにおけるブロックセクションに対応しているセカンドマスクのセクションもブロックされる。ファーストマスクにおける符号化されたセクションに対応しているサードマスクのセクションは、サードコードを有している。このサードコードは、ファーストコードを補足し、ファーストマスクのブロックセクションに対応しているサードマスクのセクションもブロックされる。システムにおける複数のユーザーは、2つのセクション中ファーストがブロックされセカンドは符号化される中でマスクを有する。一方、他のユーザーは、2つのセクション中セカンドがブロックされファーストが符号化される中でマスクを有する。エンコーディングマスクを符号化するために用いられるファーストコードは、安定した両極直交式コードから導かれた単極コードのセットから選択される。 ...

PHASE CHIP FREQUENCY-BINS OPTICAL CODE DIVISION MULTIPLE ACCESS

Apparatus and system for transmitting and receiving Optical code division multiple access data over an optical Network. The apparatus comprises a spectral phase decoder for Decoding the encoded optical signal to produce a decoded Signal, a time gate for temporally extracting a user signal From the decoded signal, and a demodulator that is operable to Extract user data from the user signal. The system preferably Comprises a source for generating a sequence of optical Pulses, each optical pulse comprising a plurality of spectral Lines uniformly spaced in frequency so as to define a Frequency bin, a data modulator associated with a subscriber And operable to modulate the sequence of pulses using Subscriber data to produce a modulated data signals and a Hadamard encoder associated with the data modulator and Operable to spectrally encode the modulated data signal to Produce an encoded data signal.

OPTICAL COMMUNICATION SYSTEM USING OPTICAL FREQUENCY CODE, OPTICAL TRANSMISSION DEVICE AND OPTICAL RECEPTION DEVICE THEREOF, AND REFLECTION TYPE OPTICAL COMMUNICATION DEVICE

Apparatus and method for establishing frame synchronization in distributed digital data communication systems

A method and apparatus for carrying out synchronous codivision multiple access (SCDMA) communication of multiple channels of digital data over a shared transmission media such as a cable television system coaxial cable, a fiber optic or copper conductor telephone link, terrestial microwave, satellite link, local or wide area network, wireless including cellur network or some combination of these media using suitable interface circuitry. The system includes modems at remote units and a central unit to receive time division multiplexed digital data arranged into timeslots or channels and uses orthogonal codes to encode each channel of multiple data and spread the energy of each channel data over a frame of data transmitted in the code domain. Spreading the data this way makes the system less susceptible to impulse noise. Frames are synchronized as between remote and central units using a ranging scheme which is also useful in any other system transmitting data by frames in a distributed system ...

Optical CDMA system using sub-band coding

An optical fiber communications system using spread spectrum code division multiple access techniques to achieve better bandwidth utilization. A transmitting user in the system encodes the optical signal using a first coding mask, and a receiving user decodes the received signal using two decoding masks, all of the masks having lengths N. The first mask is divided into two sections of lengths N/2 each, one of the sections defining a first sub-code of length N/2, while the other section blocks light. Each of the second and third masks is also divided into two sections, which correspond to the two sections of the first mask. The section of the second mask corresponding to the coded section of the first mask has a second code that is identical to the first code, and the section of the second mask corresponding to the blocked section of the first mask is also blocked. The section of the third mask corresponding to coded section of the first mask has a third code that is complementary to the ...

OPTICAL DEVICE FOR SIMULTANEOUSLY GENERATING AND PROCESSING OPTICAL CODES

ASYMMETRIC ORTHOGONAL CODES FOR OPTICAL COMMUNICATIONS

A system (101-139) receives a transmitted optical signal and generates an orthogonal despreading code that is different than the code used to spread the transmitted signal. The system (101-139) then despreads the received signal using the despreading code. By using a code to desperead the received signal that is different than the code used to spread the signal, the overall interference in the system can be reduced and even eliminated.

Systems and methods for multiplexing and demodulation at high frequencies and increased communication bandwidth

Free-space communication systems and methods are provided. The systems include a transmitter that combines multiple sets of radio-frequency-modulated optical carrier frequencies for transmission across free space using multiple transmission apertures. Different sets of signals are filtered to form single sideband signals. The different sets of single sideband signals are then combined to form dense wavelength division multiplexed signals. In addition, combined sets of signals of different polarizations can be combined. A receiver can include a single receive aperture.

Aparelho e método para transmissão digital de dados

<MU><B>"APARELHO E MéTODO PARA TRANSMISSãO DIGITAL DE DADOS"<MV><D>. Método e aparelho para a transmissão de comunicação de acessos múltiplos com co-divisão sincrónica (SCDMA) de múltiplos canais de dados digitais por um meio de transmissão simultaneamente (1162). O sistema inclui modens de unidade central (1164) e uma unidade central (1160) para receber em tempo de múltiplo dados digitais multiplexidados com espaços de tempo ou canais e utilizar códigos ortogonais para codificar cada canal de dados múltiplos e distribuir a energia de cada dado do canal através de uma estrutura de dado transmitida em um código. Estruturas são sincronizadas entre remota (1164) e unidades central (1160) utilizando um esquema que é também utilizado em qualquer sistema de transmissão de dados por estruturas em um sistema distribuidor onde sincronizando as estruturas bem como entre todas as unidades diferenciais em atrasos propagados é necessário. Cada estrutura no esquema modular SCDMA inclui uma folga ou brecha contendo nenhum dado.

Converged pon for tdma-pon service based on ofdma-pon

A converged passive optical network (CPON) and a data transmission method are disclosed. The CPON is a combination of a time division multiple access-passive optical network (TDMA-PON) and an orthogonal frequency division multiple access-passive optical network (OFDMA-PON) and is able to dynamically controlling a bandwidth for upstream signal transmission through allocation of multiple subcarriers to each single optical network unit (ONU).

METHODS AND APPARATUS FOR CONTROLLABLE COUPLING OF AN ELECTROMAGNETIC WAVE

Aspects of the subject disclosure may include, a coupler having a first member coupled to a transmission medium, a first component coupled to the first member, a second member coupled to the transmission medium, and a second component coupled to the second member. The first component can facilitate transmission of first signals via the first member, and the second component can facilitate transmission of second signals via the second member. The first signals and the second signals can in turn induce electromagnetic waves that propagate along the transmission medium without requiring an electrical return path. Other embodiments are disclosed. 1. A coupler , comprising:a first member coupled to a transmission medium;a first component of a splitting device, the first component coupled to the first member;a second member coupled to the transmission medium; anda second component of the splitting device, the second component coupled to the second member,wherein a distal end of each of the first member and the second member is separated from an outer surface of the transmission medium,wherein the first component facilitates transmission of first signals via the first member,wherein the second component facilitates transmission of second signals via the second member,wherein the first signals differ from the second signals, andwherein the first signals and the second signals induce first electromagnetic waves that propagate along the transmission medium without requiring an electrical return path.2. The coupler of claim 1 , wherein the first component comprises a first amplifier claim 1 , a first phase shifter claim 1 , or a combination thereof claim 1 , wherein the second component comprises a second amplifier claim 1 , a second phase shifter claim 1 , or a combination thereof claim 1 , and wherein the first component operates independently of the second component.3. The coupler of claim 1 , wherein a first operation of the first component is adjustable independently of a ...

APPARATUS AND METHOD FOR INCREASED DATA RATES IN UNDERWATER COMMUNICATIONS USING ORBITAL ANGULAR MOMENTUM

A system for providing underwater communication using orbital angular momentum (OAM) includes a transmitter that processes input data to be transmitted using pre-coding information based on current transmission channel conditions to maximize data rate based on channel conditions. A receiver receives a transmitted multiplexed OAM optical signal and analyzes the received signal for channel state information. The channel state information is used to determine a set of pre-coding values that allow the transmitter to pre-code the input data to maximize the data rate based on current channel conditions. The pre-coding values are mapped to a codebook entry which identifies the pre-coding values. The codebook entry is transmitted from the receiver to the transmitter. The transmitter uses the received codebook entry to identify pre-coding values used to process subsequent input data to be transmitted in order to enhance data rate across the transmit channel. 1. An underwater optical communications system including a transmitter and a receiver; the transmitter receiving input data and generating a plurality of orbital angular momentum optical signals based on the input data , the plurality of orbital angular momentum optical signals are transmitted by the transmitter into a water medium; and the receiver receives the plurality of orbital angular momentum optical signals and generates output data from the received plurality of orbital angular momentum optical signals.2. The system of claim 1 , wherein the transmitter performs orthogonal frequency division multiplexing on the input data to split the input data into a plurality of subcarriers.3. The system of claim 1 , wherein the receiver analyzes the received plurality of orbital angular momentum optical signals and/or an optical pilot beam transmitted by the transmitter and received by the receiver for channel performance; and further comprising a feedback channel from the receiver to the transmitter claim 1 , the feedback ...

SYSTEMS AND METHODS FOR MULTIPLEXING AND DEMODULATION AT HIGH FREQUENCIES AND INCREASED COMMUNICATION BANDWIDTH

Free-space communication systems and methods are provided. The systems include a transmitter that combines multiple sets of radio-frequency-modulated optical carrier frequencies for transmission across free space using multiple transmission apertures. Different sets of signals are filtered to form single sideband signals. The different sets of single sideband signals are then combined to form dense wavelength division multiplexed signals. In addition, combined sets of signals of different polarizations can be combined. A receiver can include a single receive aperture. 1. A communication system , comprising: a plurality of light sources, wherein each light source is operable to output at least one optical carrier frequency;', 'a plurality of modulators, wherein each carrier frequency is associated with a modulator, and wherein each modulator is operable to modulate the associated carrier frequency with a radio frequency signal, wherein the modulators form modulated signals;', 'a plurality of multiplexers, wherein each multiplexer is operable to combine modulated signals from at least two of the modulators, wherein the multiplexers form wavelength division multiplexed signals;', 'a plurality of interleavers, wherein each interleaves: is operable to combine wavelength division multiplexed signals from at least two of the multiplexers, wherein the interleavers form sets of interleaved signals; and', 'free space optics, wherein the sets of interleaved signals are output by the free space optics., 'a transmitter, including2. The communication system of claim 1 , further comprising:beam control optics, wherein the beam control optics include a plurality of transmit apertures, wherein each transmit aperture is operable receive the signals from the multiplexers and to output at least one of the sets of interleaved signals to the free space optics.3. The communication system of claim 2 , wherein each transmit aperture outputs a different set of interleaved signals to the free ...

Multi-wavelength optical CDMA with differential encoding and bipolar differential detection

The present invention relates generally to an optical CDMA transmission system and method employing differential optical encoding and bipolar decoding. Differential encoding and bipolar decoding may be performed at the bit level, wherein differential phase encoding and decoding occurs on an entire composite signal. Differential encoding and bipolar decoding may also be performed at the chip level, wherein differential phase encoding and decoding occurs on individual spectral components of a given signal.

Two-dimensional variable code repeat OCDMA (optical code division multiple Access) system based on block chain and data processing method

本发明公开了一种基于区块链的二维变码重OCDMA系统包括：区块链，用于对用户信号进行QoS需求分类，得到QoS需求最终类别值，且每隔一小段时间将该用户的QoS需求最终类别值和所要发送的数据以哈希值的形式记录到下一个区块，同时记录的还有上一个区块的哈希值；接口，用于将区块链发送的数据接入二维变码重OCDMA系统中；二维变码重OCDMA系统，用于根据用户QoS需求，将用户数据在OCDMA系统中进行差异化QoS编解码传输。本发明提出利用区块链进行用户QoS需求类别值确定，能很好地保证用户信息的安全性，防止被篡改。二维变码重OCDMA系统的实施，能满足不同用户对QoS的需求，以实现灵活多样的服务，且系统灵活经济，该系统可用于灵活调度业务的弹性光网络。

Multi-wavelength optical CDMA with differential encoding and bipolar differential detection

The present invention relates generally to an optical CDMA transmission system and method employing differential optical encoding and bipolar decoding. Differential encoding and bipolar decoding may be performed at the bit level, wherein differential phase encoding and decoding occurs on an entire composite signal. Differential encoding and bipolar decoding may also be performed at the chip level, wherein differential phase encoding and decoding occurs on individual spectral components of a given signal.

Multi-wavelength optical cdma with differential encoding and bipolar differential detection

The present invention relates generally to an optical CDMA transmission system and method employing differential optical encoding and bipolar decoding. Differential encoding and bipolar decoding may be performed at the bit level, wherein differential phase encoding and decoding occurs on an entire composite signal. Differential encoding and bipolar decoding may also be performed at the chip level, wherein differential phase encoding and decoding occurs on individual spectral components of a given signal.

Multi-wavelength optical cdma with differential encoding and bipolar differential detection

The present invention relates generally to an optical CDMA transmission system and method employing differential optical encoding and bipolar decoding. Differential encoding and bipolar decoding may be performed at the bit level, wherein differential phase encoding and decoding occurs on an entire composite signal. Differential encoding and bipolar decoding may also be performed at the chip level, wherein differential phase encoding and decoding occurs on individual spectral components of a given signal.

Space-polarization mixed diversity free space optical communication system based on optical coding

本发明实施例公开了一种基于光编码的空间‑偏振混合分集自由空间光通信系统，该通信系统中，发送组件包括光发射机、偏振/码分集光编码模块和光码空间分集光发射模块，发送组件将用户数据原始信号转换为第一光信号，再在偏振分集中进行物理层光编码再耦合，将耦合后的第一光信号通过多路准直发射透镜发射到大气中；接收组件包括光码空间分集光接收模块、半导体光放大器、偏振/码分集光解码模块和光接收机，接收组件通过多路准直接收透镜接收第二光信号并耦合再抑制湍流波动影响，在偏振分集中进行光解码再耦合，将耦合后的第二光信号进行光电转换和判决，恢复为用户数据原始信号。本发明实施例，通过物理层加密提高FSO通信安全性。

Code grouping for optical networks

The invention is directed to code labeling in an optical network. The network includes a transmitting station operable to transmit an optical signal. The network also includes an encoder coupled to the transmitting station operable to label the optical signal composed of a group of codes. A receiving station operable to receive the labeled group of optical codes is also provided. The receiving station is operable to read the optical signal if the label of the received group of codes corresponds to the group of codes assigned to the receiving station.

Asymmetric orthogonal codes for optical communications

A system ( 101-139 ) receives a transmitted optical signal and generates an orthogonal despreading code that is different than the code used to spread the transmitted signal. The system ( 101-139 ) then despreads the received signal using the despreading code. By using a code to despread the received signal that is different than the code used to spread the signal, the overall interference in the system can be reduced and even eliminated.

OFDM transponder interface with variable bit transfer rate in optical communications systems

已经提出OFDM(正交频分复用)，用于处理光网络中的WDM信道上的信号。从发射节点向远端发射光信号时所利用的OFDM子载波信道的数目被改变以与WDM信道中的传输质量相适应。响应于来自远端节点的控制信号来设置所使用的子载波信道的数目，以优化WDM信道的光性能。

Interferometric element, interferometric n-stage tree element, and method of processing a first optical input signal and a second optical input signal so as to provide a plurality of orthogonal output signals

The invention relates to an interferometric element comprising a first interferometer of the Mach-Zehnder type and a second interferometer of the Mach-Zehnder type, said first interferometer comprising a first input coupling element and a first output coupling element, and said second interferometer comprising a second input coupling element and a second output coupling element, said input coupling elements being optically connected to the output coupling elements by means of transmission lines, such that for each of the output coupling elements at least one delayed transmission line from among the respective associated transmission lines is designed for providing a frequency-dependent phase shift that differs from the frequency-dependent phase shift of the or each of the other, non-delayed transmission lines connected to the relevant output coupling element, while at least one of the transmission lines in the interferometric element is designed for providing an additional, frequency-independent phase shift, wherein the first and the second interferometer are optically coupled to one another cross-wise such that at least one transmission line of the first input coupling element is connected to the second output coupling element, and that at least one transmission line of the second input coupling element is connected to the first output coupling element. Furthermore, the invention relates to an N-stage tree element comprising the interferometric elements and to the use of the element.

Systems and methods for multiplexing and demodulation at high frequencies and increased communication bandwidth

Free-space communication systems and methods are provided. The systems include a transmitter that combines multiple sets of radio-frequency-modulated optical carrier frequencies for transmission across free space using multiple transmission apertures. Different sets of signals are filtered to form single sideband signals. The different sets of single sideband signals are then combined to form dense wavelength division multiplexed signals. In addition, combined sets of signals of different polarizations can be combined. A receiver can include a single receive aperture.

Apparatus and method for digital data transmission

A method and apparatus for carrying out synchronous co-division multiple access (SCDMA) communication of multiple channels of digital data over a shared transmission media (1162). The system includes modems at remote units (1164) and a central unit (1160) to receive time division multiplexed digital data arranged into timeslots or channels and uses orthogonal codes to encode each channel of multiple data and spread the energy of each channel data over a frame of data transmitted in a code domain. Frames are synchronized as between remote (1164) and central units (1160) using a ranging scheme which is also useful in any other system transmitting data by frames in a distributed system where synchronizing the frames as between all units regardless of differences in propagation delays is necessary. Each frame in the SCDMA modulation scheme includes a gap or guardband containing no other data.

Trellis coder and method for trellis coding in a device or a method for digital data transmission

Methods for configurable non-orthogonal multiple access transmission

Aspects of the present disclosure provide a scheme for generating a multiple access (MA) signal that include mapping each of at least one stream of bits to generate a set of modulated symbols and transmitting the set of modulated symbols. The spreading signatures that are selected to map the at least one stream of bits are selected, at least in part, based on a set of compatibility rules. The spreading involves mapping each stream of bits using a respective spreading signature from a set of spreading signatures to generate a respective set of modulated symbols, wherein real spreading signature components of the spreading signatures are orthogonal to each other and imaginary spreading signature components of the spreading signatures are orthogonal to each other.

Forward Discrete/Inverse-Discrete Fourier Transform Device and Method for Optical OFDM Communication and Transmitting and Receiving Apparatus Comprising the Device

Disclosed are a forward discrete/inverse-discrete Fourier transform device and method for optical orthogonal frequency division multiplexing (OFDM) communication and a transmitting and receiving apparatus.The forward inverse-discrete Fourier transform device includes N 1:N splitters for splitting subcarrier signals received from N inputs corresponding to the number of optical frequencies of subcarriers, a phase shift delay array module for shifting phases of the split signals from the 1:N splitters, N N:1 power couplers for coupling signals output from the phase shift delay array module, a time delay array module for performing time delay on optical OFDM symbols from the N:1 power couplers, and an N:1 power coupler for coupling signals output from the time delay array module.

Optical communication system using optical frequency code, optical transmission device and optical reception device thereof, and reflection type optical communication device

The invention dispenses with calibration of the optical frequency of the light source and permits the use of many codes without increasing the transmission bandwidth used. Let the optical frequency width of the light source be represented by FSR and the code length of every code be represented by FSR, the codes are made to be orthogonal to each other. The optical intensity-frequency characteristic of an n-th optical code signal is set to Cn(f) = (1 + cos(2Àsf/FSR + rÀ/2))/2 (where s is an integer in the range from 1 to maximum number of codes/2, and r = 0 or 1) to provide orthogonality between the optical code signals. Alternatively, optical frequency chips are sequentially assigned to chip sequences forming the optical code signals, the optical frequency of each chip "1" is output, and a filter is provided with an optical filtering characteristic of a concatenated code which is a repeated continuation of, for example a second-order Hadamard code word (0101) or (0011), and light emitted from the light source is passed through the filter to form the optical code signal. An encoding optical frequency region 31 and a decoding optical frequency region 32 are so chosen as to cover a range of drift of the source frequency. In Fig. 13, ”F 1 and ”F 2 indicate drifts of the source frequency.

Data transmission method and device, and storage medium

Apparatus and method for digital data transmission

A method and apparatus for carrying out synchronous co-division multiple access (SCDMA) communication of multiple channels of digital data over a shared transmission media (1162). The system includes modems at remote units (1164) and a central unit (1160) to receive time division multiplexed digital data arranged into timeslots or channels and uses orthogonal codes to encode each channel of multiple data and spread the energy of each channel data over a frame of data transmitted in a code domain. Frames are synchronized as between remote (1164) and central units (1160) using a ranging scheme which is also useful in any other system transmitting data by frames in a distributed system where synchronizing the frames as between all units regardless of differences in propagation delays is necessary. Each frame in the SCDMA modulation scheme includes a gap or guardband containing no other data.

Apparatus and method for digital data transmission

Optical device that generates and processes optical code simultaneously

System and method of reducting optical beating interference noise by using delay line based optical filtering

TECHNICAL FIELD The present invention relates to a technique for reducing optical beating interference (OBI) occurring in multiple connection uplink transmission in an optical communication system based on intensity modulation / direct detection (IM / DD) An optical beating interference noise reduction system according to an exemplary embodiment of the present invention includes a plurality of optical communication network units sharing an OFDM-based optical network, the size of an optical carrier corresponding to a remaining optical communication network unit excluding a specific optical communication network unit, And a communication controller for performing a multiple access uplink transmission using an optical carrier corresponding to the plurality of optical communication network units.

One-dimensional optical coding method and code word design

本发明适用于编码技术改进领域，提供了一种一维光编码方法与码字设计，所述一维光编码存在一个或多个合法用户码字，以及多个干扰用户码字，只需满足干扰用户码字与每个合法用户码字都正交，而干扰用户之间的码字无需正交，从而扩大了码字容量，防止窃听者通过码字搜索破解，增加了光网络的物理层安全性。可应用于光接入网、光局域网、光码标记交换网络等。

A kind of optical sender, photoreceiver and optical transmission method

一种光发射机、光接收机及光传输方法，用于解决现有技术存在的解复用复杂度高的问题。光发射机包括光信号产生器、N个扩频器、N对数据调制器以及合路器；光信号产生器产生N路单一波长的光载波；第i个扩频器针对光信号产生器产生的第i路光载波进行扩频处理得到具有两个子载波的扩频光信号以及将扩频光信号分为第一光信号以及第二光信号，并针对第二光信号进行延时处理得到第三光信号；第i对数据调制器针对第一光信号以及第三光信号进行调制处理得到一对调制光信号，并将一对调制光信号分别传输给合路器；到达合路器的一对调制光信号在时域上相差1/4f si ；合路器将由N对数据调制器传输来的N对调制光信号合路为一路光信号。

Methods and apparatus for controllable coupling of an electromagnetic wave

Aspects of the subject disclosure may include, a coupler having a first member coupled to a transmission medium, a first component coupled to the first member, a second member coupled to the transmission medium, and a second component coupled to the second member. The first component can facilitate transmission of first signals via the first member, and the second component can facilitate transmission of second signals via the second member. The first signals and the second signals can in turn induce electromagnetic waves that propagate along the transmission medium without requiring an electrical return path. Other embodiments are disclosed.

Apparatus and method for digital data transmission

A method and apparatus for carrying out synchronous co-division multiple access (SCDMA) communication of multiple channels of digital data over a shared transmission media (1162). The system includes modems at remote units (1164) and a central unit (1160) to receive time division multiplexed digital data arranged into timeslots or channels and uses orthogonal codes to encode each channel of multiple data and spread the energy of each channel data over a frame of data transmitted in a code domain. Frames are synchronized as between remote (1164) and central units (1160) using a ranging scheme which is also useful in any other system transmitting data by frames in a distributed system where synchronizing the frames as between all units regardless of differences in propagation delays is necessary. Each frame in the SCDMA modulation scheme includes a gap or guardband containing no other data.

Method and apparatus for reduced interference in optical cdma

A multi-user optical fiber communications system uses spread spectrum code division multiple access techniques to achieve better bandwidth utilization. Each channel of the system is provided with light source that is temporally and spectrally modulated by an encoder. Modulation is accomplished by first passing the data through a pulse modifier to obtain a stream of shortened pulses with a reduced duty cycle. The modulated light is coupled to a fiber and data are recovered by the decoder. The source includes a superluminescent fiber source that is split multiple times and amplified in a hierarchical manner to produce a plurality of like sources. The like sources are decorrelated by adding delays to the different sources. Each of the encoders includes an encoding mask having a first code that encodes the optical signal. Light, spatially encoded by the mask and temporally modulated with data, is transmitted over a fiber link with the signals of other users and received by a decoder. Within each decoder, a polarization insensitive separator splits the received light into two equal power components which are provided to two decoding masks used to decode the signal. One of the masks has a second code identical to the first code and the other mask has a third code complementary to the first code. The output light beams filtered by the masks are differentially detected to generate an output signal, which is further processed for data recovery. The electrical signal is low pass filtered and electrically square law detected. The first codes are selected from a set of unipolar codes derived from a set of balanced bipolar orthogonal codes. The codes may be either binary or analog.

Data transmission method and device, and storage medium

The present application provides a data transmission method and device, and a storage medium. The method comprises: obtaining a first type of data and a second type of data to be transmitted, wherein the transmission delay allowed by the first type of data is smaller than the transmission delay allowed by the second type of data; and transmitting the first type of data that needs immediate transmission on a first carrier frequency band of a transmission channel between a target optical network unit and an optical line unit; the transmission channel allows simultaneous transmission of the first type of data and the second type of data, the lowest frequency in a second frequency band for transmitting the second type of data on the transmission channel being higher than the highest frequency in the first carrier frequency band.

Air conditioner

An air conditioner is provided that includes a plurality of indoor units configured to be distributed and installed in a plurality of floors in a building; a controller configured to monitor and control the plurality of indoor units; and a wireless communication unit configured to transmit and receive data by the controller, the plurality of indoor units, and one outdoor unit using a wireless communication method. The wireless communication unit comprises a transmitter and a receiver using a Sub-GHz band frequency. The transmitter includes an optical orthogonal code generator configured to first cipher source data using an optical orthogonal code, and a narrow-band chaotic signal generator configured to secondarily cipher using a chaotic signal. The source data is sequentially encrypted through the optical orthogonal code generator and the narrowband chaotic signal generator and then transmitted.

Interkanal-zeit-codierungsverfahren für mehrkanalige übertragungssysteme

Wired/wireless converged mac adaptor and method of transmitting frame using wired/wireless converged mac adaptor

A wired/wireless converged media access control (MAC) adaptor and a method for transmitting a frame using the same. The wired/wireless converged MAC adaptor may include a service network interface (SNI) to transmit a MAC frame corresponding to a wired or wireless service, or common public radio interface (CPRI) data, a frame conversion unit to convert, into an orthogonal frequency division multiplexing (OFDM) frame, a wired/wireless converged MAC frame having a common frame structure of the MAC frame corresponding to the wired or wireless service or the CPRI data, and an OFDM interface configured to transmit the OFDM frame to an optical OFDM modem by dynamically allocating sub-carriers based on data transmission characteristics.

一种自相关及互相关约束为2的光正交码的构造方法

本发明公开了一种自相关及互相关约束为2的光正交码的构造方法，包括以下步骤：根据需要构造的码字数量n和码重w，构造整数对表N；根据所述整数对表N，按照预设取数规则构造自相关及互相关约束为2的光正交码码字传号差距离三角阵D及差距离对集合T；根据由所述传号差距离三角阵D构成的映射关系，构造自相关及互相关约束为2的光正交码码字。通过构造整数对表N并按预设取数规则从中取数，构造满足所有差距离对元素不能重复出现的传号差距离三角阵D和差距离对集合T，从而可以有效构造自相关及互相关约束为2的光正交码码字；构造的码字数量多、码重数值大；能构造任意数量、任意码重的自相关及互相关约束为2的光正交码码字。

Ｏｆｄｍ 방식을 이용한 ｗｄｍ-ｐｏｎ 시스템

직교주파수 다중분할(OFDM) 방식의 파장분할 다중방식 수동형 광통신망(WDM-PON) 시스템이 개시된다. 소정 주파수 대역에서 노이즈가 낮은 광신호를 출력하는 광원; 직교주파수 다중분할(OFDM) 방식의 신호를 상기 소정 주파수 대역으로 출력하는 OFDM부; 및 상기 광원이 출력하는 광신호에 상기 OFDM부가 출력하는 OFDM 신호를 변조하는 변조부

一种基于复合涡旋光束的编码光通信方法及系统

本发明公开一种基于复合涡旋光束的编码光通信方法及系统，包括：通过调节拉盖尔高斯光束的轨道角动量和相位差，将不同轨道角动量的拉盖尔高斯光束在相位差模式下叠加，以将待传输数字信号编码为复合涡旋光束；通过模拟的大气湍流的功率谱得到随机相位屏的相位功率谱，以此构建大气湍流相位屏；通过大气湍流相位屏进行复合涡旋光束传输的模拟，并获取复合涡旋光束传输后的光斑，采用训练后的解码器对光斑进行解码得到待传输数字信号。使用不同轨道角动量的拉盖尔高斯光束叠加形成复合涡旋光束，通过调控涡旋光束间的相位差使叠加光强发生变化，实现使用有限的拓扑荷提高通信的信道容量，增强译码准确率，提高光通信系统的可靠性。

一种基于复合涡旋光束的编码光通信方法及系统

本发明公开一种基于复合涡旋光束的编码光通信方法及系统，包括：通过调节拉盖尔高斯光束的轨道角动量和相位差，将不同轨道角动量的拉盖尔高斯光束在相位差模式下叠加，以将待传输数字信号编码为复合涡旋光束；通过模拟的大气湍流的功率谱得到随机相位屏的相位功率谱，以此构建大气湍流相位屏；通过大气湍流相位屏进行复合涡旋光束传输的模拟，并获取复合涡旋光束传输后的光斑，采用训练后的解码器对光斑进行解码得到待传输数字信号。使用不同轨道角动量的拉盖尔高斯光束叠加形成复合涡旋光束，通过调控涡旋光束间的相位差使叠加光强发生变化，实现使用有限的拓扑荷提高通信的信道容量，增强译码准确率，提高光通信系统的可靠性。

信道间-时间编码方法、编码器以及多信道光传输系统

本发明描述了一种用于多信道光传输系统(10)的编码方法，其中同时在时间方向和多个信道上实现编码，为编码选择一种映射，使得排除了在相邻信道中同时出现信号值为‘1’的比特。此外本发明还描述了一种实现本方法的多信道光传输系统，以及与这种多信道光传输系统(10)结合使用的编码器(12)。

一种严格相关约束光正交码的构造方法

本发明公开了一种严格相关约束光正交码的构造方法，包括以下步骤：根据需要构造的码字数量n和码重w构造整数数列M；根据预定取数规则从所述整数数列M中取数，构造严格相关约束光正交码码字的传号差距离三角阵D；根据所述传号差距离三角阵D和已取数完成的所述整数数列M，按照预定优化规则优化码长F；根据由所述传号差距离三角阵D构成的映射关系，构造严格相关约束光正交码码字。通过构造传号差距离三角阵并按照映射关系构造严格相关约束光正交码码字，可以有效构造的严格相关约束光正交码码字数量多、码重数值大；可以构造出任意码重、任意数量的严格相关约束光正交码码字；通过预定优化规则优化码长，编码效率高。

基于扩展的正交拉丁矩阵的多长度光正交码的构造方法

本发明公开了一种基于扩展的正交拉丁矩阵的多长度光正交码的构造方法，包括以下步骤：构造扩展的正交拉丁矩阵；根据所述扩展的正交拉丁矩阵构造严格相关约束的变码长映射序列；根据由所述变码长映射序列构成的映射关系，将初定光正交码构造得到严格相关约束的多长度光正交码。通过构造扩展的正交拉丁矩阵构造变码长映射序列，所构造出的变码长映射序列数量多、构造方法高效；基于所构造的映射序列构造的多长度光正交码自动满足严格相关约束，构造出的多长度光正交码码字数量接近Johnson界，该构造方法具有拓展性。

一种严格相关约束光正交码的构造方法

本发明公开了一种严格相关约束光正交码的构造方法，包括以下步骤：根据需要构造的码字数量n和码重w构造整数数列M；根据预定取数规则从所述整数数列M中取数，构造严格相关约束光正交码码字的传号差距离三角阵D；根据所述传号差距离三角阵D和已取数完成的所述整数数列M，按照预定优化规则优化码长F；根据由所述传号差距离三角阵D构成的映射关系，构造严格相关约束光正交码码字。通过构造传号差距离三角阵并按照映射关系构造严格相关约束光正交码码字，可以有效构造的严格相关约束光正交码码字数量多、码重数值大；可以构造出任意码重、任意数量的严格相关约束光正交码码字；通过预定优化规则优化码长，编码效率高。

Data transmission method and device, and storage medium

超长距离无中继光传输系统

本发明针对现有技术中存在的技术问题，提供一种超长距离无中继光传输系统，其包括第一光信号调制器、光信号编码器、第一光放大器、光信号解码器、第二光放大器、光电转换器、第一低通滤波器、第二光信号调制器和第二低通滤波器；随着光纤通信技术的迅猛发展，超长距离无中继光传输系统采用端到端直达通路，整个传输线路不需要中继，具有可靠性高，建设成本低、开通迅速、维护方便等突出特点，非常适合部分边海防哨所的通信。基于一维严格最佳光正交码的基础上运用光纤布拉格光栅作为编码器和光纤时延线作为解码器设计的OCDMA超长距离无中继光传输系统，实现155Mbps用户光信号400公里无中继传输。

광 부호 분할 다중 접속 시스템에서의 고속 부호 획득 방법및 그 장치

본 발명은 광 부호 분할 다중 접속(code division multiple access: CDMA) 시스템에서의 고속 부호 획득(code acquisition) 방법 및 고속 부호 획득 장치에 관한 것으로, 특히 부호 획득 단계의 첫 단계에서 두 개의 문턱값을 사용함으로써 고속으로 부호 획득할 수 있도록 하는 광 CDMA 시스템에서의 고속 부호 획득 방법 및 그 장치에 관한 것이다.

一种二维λ-t光编码方法与码字设计

本发明适用于编码技术改进领域，提供了一种二维光编码方法与码字设计，所述二维光编码存在一个或多个合法用户码字，以及多个干扰用户码字，只需满足干扰用户码字与每个合法用户码字都正交，而干扰用户之间的码字无需正交，从而扩大了码字容量，防止窃听者通过码字搜索破解，增加了光网络的物理层安全性。可应用于光接入网、光局域网、光码标记交换网络、光纤传感器网等。

Method of allocating upstream bandwidth resource and method of transmitting upstream data in orthogonal frequency division multiple access-open optical subscriber network

There are provided a method of allocating upstream bandwidth resources and a method of transmitting upstream data in an orthogonal frequency division multiple access-open optical subscriber network. The method of allocating an upstream bandwidth resource according to an embodiment of the invention includes receiving queue status information from each optical network unit (ONU), and allocating an upstream bandwidth by providing to each ONU a 2-D upstream bandwidth map on a subcarrier-time resource through a frame synchronized at constant cycles, based on the queue status information received from each ONU.

基于扩展的正交拉丁矩阵的多长度光正交码的构造方法

本发明公开了一种基于扩展的正交拉丁矩阵的多长度光正交码的构造方法，包括以下步骤：构造扩展的正交拉丁矩阵；根据所述扩展的正交拉丁矩阵构造严格相关约束的变码长映射序列；根据由所述变码长映射序列构成的映射关系，将初定光正交码构造得到严格相关约束的多长度光正交码。通过构造扩展的正交拉丁矩阵构造变码长映射序列，所构造出的变码长映射序列数量多、构造方法高效；基于所构造的映射序列构造的多长度光正交码自动满足严格相关约束，构造出的多长度光正交码码字数量接近Johnson界，该构造方法具有拓展性。

一种信号传输的方法和装置

本申请提供了一种信号传输的方法和装置。该方法包括：发射机侧获取到N点第一信号，并对该N点第一信号进行信号分离处理，得到两组信号(如，N点第二信号和N点第三信号)，基于分离得到的两组信号确定四个N/2点信号，该四个N/2点信号组合得到待发送的3N/2点信号，并向接收机侧发送该3N/2点信号，使得接收机基于接收到的3N/2点信号即可恢复出N点第一信号，从而可以在不增加功耗的前提下，提高信号传输的频谱效率。

Verfahren und vorrichtung zur digitalen datenübertragung

Signal transmission method and apparatus

一种严格相关约束光正交签名图形码的构造方法

本发明公开了一种严格相关约束光正交签名图形码的构造方法，包括以下步骤：根据需要构造的严格相关约束光正交签名图形码码字数量n和码重w构造整数对表N；根据整数对表N，按照预设取数规则构造严格相关约束光正交签名图形码码字传号二维差距离三角阵D i (i＝1,2,…,n)；根据由传号二维差距离三角阵D i (i＝1,2,…,n)构成的映射关系，构造严格相关约束光正交签名图形码码字。通过构造传号二维差距离三角阵D i (i＝1,2,…,n)并按照映射关系构造严格相关约束光正交签名图形码码字，可以有效构造的严格相关约束光正交签名图形码码字数量多、码重数值大，可以构造出任意码重、任意数量的严格相关约束光正交签名图形码码字。

多重搬送波を利用したコード分割多重化方式の受動型光加入者網

【課題】複雑なＭＡＣプロトコルを使用せずに済み、送／受信器の信号処理複雑性を低減し且つ同期化問題を解決することができる受動型光加入者網を提供する。 【解決手段】ＯＬＴへのデータ転送のために多重搬送波を利用するＣＤＭＡ方式を使用し、ＯＬＴからはイーサネット（登録商標：以下同）方式でデータを受信するＯＮＵ／ＯＮＴ２１と、ＯＮＵ／ＯＮＴから受信したＣＤＭＡ方式のデータをイーサネット方式のデータに変えて他局に伝達し、ＯＮＵ／ＯＮＴへはイーサネット方式のデータ転送を行うＯＬＴと、多数のＯＮＵ／ＯＮＴからのＣＤＭＡ方式の光信号をカップリングしてＯＬＴに伝達し、ＯＬＴからのイーサネット方式の光信号を多数のＯＮＵ／ＯＮＴに分配する光カップラー２５と、を備えることを特徴とした多重搬送波を利用したＣＤＭＡ方式の受動型光加入者網とする。 【選択図】図５Ａ

自相关约束为2、互相关约束为1的光正交签名图形码的构造方法

本发明公开了一种自相关约束为2、互相关约束为1的光正交签名图形码的构造方法，包括以下步骤：S1.根据所需构造的自相关约束为2、互相关约束为1的光正交签名图形码的码字数量和码重，构造整数对表N；S2.按照预设取数规则从整数对表N中取数，构造自相关约束为2、互相关约束为1的光正交签名图形码码字传号二维差距离三角阵 i (i＝1,2,…,)以及二维差距离对集合 i (＝1,2,…,n)；S3.根据由传号二维差距离三角阵 i (＝1,2,…,n)构成的映射关系，构造自相关约束为2、互相关约束为1的光正交签名图形码。本发明所构造的光正交签名图形码可作为并行光码分多址图像传输系统的地址码，广泛应用于需要传输图像的光接入网、无源光网络、光码标记交换网络、光纤传感器网络及光核心路由器等。

一种自相关约束为2的光正交码的构造方法

本发明公开了一种自相关约束为2的光正交码的构造方法，包括以下步骤：根据需要构造的码字数量n和码重w构造整数数列M；根据预设取数规则从所述整数数列M中取数，构造自相关约束为2的光正交码码字的传号差距离三角阵D和差距离对集合T；根据所述传号差距离三角阵D、所述差距离对集合T以及已取数完成的所述整数数列M，按照预设优化规则优化码长F；根据由所述传号差距离三角阵D构成的映射关系，构造自相关约束为2的光正交码码字。通过构造自相关约束为2的光正交码码字的传号差距离三角阵D和对应的差距离对集合T，能构造任意数量、任意码重的自相关约束为2的光正交码码字以及通过码长优化方法可以提高编码效率。

Secure key distribution for optical code division multiplexed based potical encryption

一种使用伴随涡旋光抵消轨道角动量信道串扰的方法及验证装置

本发明公开了使用伴随涡旋光抵消轨道角动量信道串扰的方法及验证装置，该方法包括以下步骤：采用激光器一和激光器二分别产生信号高斯光GDB载波和伴随高斯光GPB载波，并将数据装载到载波上分别形成信号高斯光GDB和伴随高斯光GPB；产生的GDB与GPB经过光分离与合成器后被复用成一束GDB与GPB混合的高斯光HGB；将混合的高斯光HGB照射进螺旋相位板VPP，后经过空分复用器SDM复用成携带光子轨道角动量OAM的复用光；携带光子轨道角动量OAM的复用光经过大气湍流扰动AT模拟信道后，采用光电检测器PD将接收到的带有串扰相位光信号转换为电信号，并在得到的电信号中获取有用信号。本发明实现降低涡旋信道串扰的方法，提高通信系统的性能。

超长距离无中继光传输系统

本发明针对现有技术中存在的技术问题，提供一种超长距离无中继光传输系统，其包括第一光信号调制器、光信号编码器、第一光放大器、光信号解码器、第二光放大器、光电转换器、第一低通滤波器、第二光信号调制器和第二低通滤波器；随着光纤通信技术的迅猛发展，超长距离无中继光传输系统采用端到端直达通路，整个传输线路不需要中继，具有可靠性高，建设成本低、开通迅速、维护方便等突出特点，非常适合部分边海防哨所的通信。基于一维严格最佳光正交码的基础上运用光纤布拉格光栅作为编码器和光纤时延线作为解码器设计的OCDMA超长距离无中继光传输系统，实现155Mbps用户光信号400公里无中继传输。

一种基于复合涡旋光束的编码光通信方法及系统

本发明公开一种基于复合涡旋光束的编码光通信方法及系统，包括：通过调节拉盖尔高斯光束的轨道角动量和相位差，将不同轨道角动量的拉盖尔高斯光束在相位差模式下叠加，以将待传输数字信号编码为复合涡旋光束；通过模拟的大气湍流的功率谱得到随机相位屏的相位功率谱，以此构建大气湍流相位屏；通过大气湍流相位屏进行复合涡旋光束传输的模拟，并获取复合涡旋光束传输后的光斑，采用训练后的解码器对光斑进行解码得到待传输数字信号。使用不同轨道角动量的拉盖尔高斯光束叠加形成复合涡旋光束，通过调控涡旋光束间的相位差使叠加光强发生变化，实现使用有限的拓扑荷提高通信的信道容量，增强译码准确率，提高光通信系统的可靠性。

一种使用伴随涡旋光抵消轨道角动量信道串扰的方法及验证装置

本发明公开了使用伴随涡旋光抵消轨道角动量信道串扰的方法及验证装置，该方法包括以下步骤：采用激光器一和激光器二分别产生信号高斯光GDB载波和伴随高斯光GPB载波，并将数据装载到载波上分别形成信号高斯光GDB和伴随高斯光GPB；产生的GDB与GPB经过光分离与合成器后被复用成一束GDB与GPB混合的高斯光HGB；将混合的高斯光HGB照射进螺旋相位板VPP，后经过空分复用器SDM复用成携带光子轨道角动量OAM的复用光；携带光子轨道角动量OAM的复用光经过大气湍流扰动AT模拟信道后，采用光电检测器PD将接收到的带有串扰相位光信号转换为电信号，并在得到的电信号中获取有用信号。本发明实现降低涡旋信道串扰的方法，提高通信系统的性能。

一种基于光码分多址的多用户共振光通信系统及方法

本发明公开了一种基于光码分多址的多用户共振光通信系统及方法，包括基站和移动端，所述移动端包括位于不同用户处的收发信机；所述基站与每一个收发信机之间形成共振腔；所述基站包括第一回复反射器、第一增益介质、第一电光调制器、第一分束器、第一光电探测器、第一信号处理板、第二光电探测器、第一同步装置和第二信号处理板；所述收发信机包括第二回复反射器、第二增益介质、第二分束器、第三光电探测器、耦合器、第三信号处理板、第二同步装置和第二电光调制器。本发明通过编码解码结构设计，实现了多个用户在同一时间与发射机无干扰地进行通信，为共振光通信在多用户场景中的应用提供了便利。

一种信号传输的方法和装置

本申请提供了一种信号传输的方法和装置。该方法包括：发射机侧获取到N点第一信号，并对该N点第一信号进行信号分离处理，得到两组信号(如，N点第二信号和N点第三信号)，基于分离得到的两组信号确定四个N/2点信号，该四个N/2点信号组合得到待发送的3N/2点信号，并向接收机侧发送该3N/2点信号，使得接收机基于接收到的3N/2点信号即可恢复出N点第一信号，从而可以在不增加功耗的前提下，提高信号传输的频谱效率。

一种二维λ-t光编码方法与码字设计

本发明适用于编码技术改进领域，提供了一种二维光编码方法与码字设计，所述二维光编码存在一个或多个合法用户码字，以及多个干扰用户码字，只需满足干扰用户码字与每个合法用户码字都正交，而干扰用户之间的码字无需正交，从而扩大了码字容量，防止窃听者通过码字搜索破解，增加了光网络的物理层安全性。可应用于光接入网、光局域网、光码标记交换网络、光纤传感器网等。

一种一维光编码方法与码字设计

本发明适用于编码技术改进领域，提供了一种一维光编码方法与码字设计，所述一维光编码存在一个或多个合法用户码字，以及多个干扰用户码字，只需满足干扰用户码字与每个合法用户码字都正交，而干扰用户之间的码字无需正交，从而扩大了码字容量，防止窃听者通过码字搜索破解，增加了光网络的物理层安全性。可应用于光接入网、光局域网、光码标记交换网络等。

基于区块链的二维变码重ocdma系统及数据处理方法

本发明公开了一种基于区块链的二维变码重OCDMA系统包括：区块链，用于对用户信号进行QoS需求分类，得到QoS需求最终类别值，且每隔一小段时间将该用户的QoS需求最终类别值和所要发送的数据以哈希值的形式记录到下一个区块，同时记录的还有上一个区块的哈希值；接口，用于将区块链发送的数据接入二维变码重OCDMA系统中；二维变码重OCDMA系统，用于根据用户QoS需求，将用户数据在OCDMA系统中进行差异化QoS编解码传输。本发明提出利用区块链进行用户QoS需求类别值确定，能很好地保证用户信息的安全性，防止被篡改。二维变码重OCDMA系统的实施，能满足不同用户对QoS的需求，以实现灵活多样的服务，且系统灵活经济，该系统可用于灵活调度业务的弹性光网络。

基于光编码的空间-偏振混合分集自由空间光通信系统

本发明实施例公开了一种基于光编码的空间‑偏振混合分集自由空间光通信系统，该通信系统中，发送组件包括光发射机、偏振/码分集光编码模块和光码空间分集光发射模块，发送组件将用户数据原始信号转换为第一光信号，再在偏振分集中进行物理层光编码再耦合，将耦合后的第一光信号通过多路准直发射透镜发射到大气中；接收组件包括光码空间分集光接收模块、半导体光放大器、偏振/码分集光解码模块和光接收机，接收组件通过多路准直接收透镜接收第二光信号并耦合再抑制湍流波动影响，在偏振分集中进行光解码再耦合，将耦合后的第二光信号进行光电转换和判决，恢复为用户数据原始信号。本发明实施例，通过物理层加密提高FSO通信安全性。

适用于ocdma系统的二维变码重光正交码的构造方法

本发明公开了一种适用于OCDMA系统的二维变码重光正交码的构造方法，获取素数阶、非素数幂奇数阶和n元集中的n阶拉丁方得到对应的MOLS组，并将所述MOLS组转置和升序合并排列后得到第一波长跳频序列和第二波长跳频序列，获取码长、码重集、自相关限集和互相关限构建一维严格变码重光正交码，获取特殊元素集，并且所述特殊元素集中的元素个数为码重数，并根据设定的码字间隔，将合格码字间隔转换成对应“0，1”序列，得到合格码字，将所述第一波长跳频序列和所述第二波长跳频序列中的设定的多个元素的对应波长映射到对应所述一维严格变码重光正交码的脉冲“1”上，得到二维变码重光正交码，增加码容量，提高系统稳定性。

一种光发射机、光接收机及光传输方法

一种光发射机、光接收机及光传输方法，用于解决现有技术存在的解复用复杂度高的问题。光发射机包括光信号产生器、N个扩频器、N对数据调制器以及合路器；光信号产生器产生N路单一波长的光载波；第i个扩频器针对光信号产生器产生的第i路光载波进行扩频处理得到具有两个子载波的扩频光信号以及将扩频光信号分为第一光信号以及第二光信号，并针对第二光信号进行延时处理得到第三光信号；第i对数据调制器针对第一光信号以及第三光信号进行调制处理得到一对调制光信号，并将一对调制光信号分别传输给合路器；到达合路器的一对调制光信号在时域上相差1/4f si ；合路器将由N对数据调制器传输来的N对调制光信号合路为一路光信号。

System and apparatus for multi user communication over a single fiber

A system and apparatus includes an optical masking unit that is configured for applying a user's mask code. The mask code has a code length of at least equal to a number of users. A light source unit is coupled to the optical masking unit. The light source unit includes a number of coherent lasers. The number of coherent lasers is at least equal to half the number of users. Each of the coherent lasers is configured for operation at a different specific prescribed operating frequency. A modulation unit is configured for applying the user's data to the coherent lasers. An optical combiner unit is operable for combining outputs of the coherent lasers to an optical fiber input.

Swdm、ocdm和tdm相融合的ng-pon方案

本发明提供了一种SWDM、OCDM和TDM相融合的NG‑PON方案，属于光接入网领域。网络组成从局端到用户端依次为，一级波分复用（WDM）网络、阵列波导光栅(AWG)结构、n个二级光码分复用（OCDM）网络（λ 1 ~λ n ）和TDM‑PON网络。下行采用堆栈波分复用（SWDM）方式，上行采用光回环技术和OCDM技术，同时，光远端节点对现TDM‑PON网络经OCDMA编码后透明传输。解决了单一复用技术的NG‑PON方案在技术成熟性、系统复杂性、成本等方面都存在不足的问题。较现有单一复用NG‑PON技术，本发明方案更加合理，不仅继承了WDM和OCDM技术在光信息处理技术易实现的优势，能满足NG‑PON技术要求，同时也能够兼容现有TDM‑PON技术，保持了用户端的低成本。