PHASE-CONTINUOUS TUNABLE LASER

A tunable laser comprises a first tuner configured to select an emission wavelength of the laser a second tuner configured to adjust a cavity mode of the laser by modifying the cavity optical path length. The second tuner is constrained by a finite tuning range. The tunable laser also comprises a controller configured to control the first and second tuners to select the emission wavelength and adjust the cavity mode in synchronization to perform phase-continuous tuning across a range larger than supported by the finite tuning range of the second tuner. 1. A tunable laser , comprising:a first tuner configured to select an emission wavelength of the laser;a second tuner configured to adjust a cavity mode of the laser by modifying the cavity optical path length, wherein the second tuner is constrained by a finite tuning range; anda controller configured to control the first and second tuners to select the emission wavelength and adjust the cavity mode in synchronization to perform phase-continuous tuning across a range larger than supported by the finite tuning range of the second tuner.2. The tunable laser of claim 1 , wherein the first tuner comprises a mechanically tuned filter comprising at least one of a diffraction grating claim 1 , a mirror claim 1 , and a prism.3. The tunable laser of claim 2 , further comprising a direct drive motor configured to rotate the diffraction gating claim 2 , mirror claim 2 , or prism about its own center.4. The tunable laser of claim 1 , wherein the second tuner comprises a polarization controller that linearly advances a phase of an input wavelength from 0 to 2π in successive drive periods of sinusoidal drive voltages.5. The tunable laser of claim 4 , wherein the polarization controller comprises waveplates and at least one of the waveplates is rotated about an axis to linearly advance the phase of the input wavelength from 0 to 2π in successive drive periods of the sinusoidal drive voltages.6. The tunable laser of claim 5 , ...

SYSTEMS AND METHODS FOR DETECTING DEFECTS IN AN ANTENNA ARRAY AND/OR IN A DEVICE COUPLED TO THE ANTENNA ARRAY

Various illustrative embodiments disclosed herein generally pertain to detecting defects by using a radio-frequency debugging signal transmitted by a transmitting antenna array towards a receiving antenna located in a far-field region of the transmitting antenna array. The radio-frequency debugging signal, which is configured to provide information pertaining to a signal radiation distribution of the transmitting antenna array, is received in the receiving antenna and conveyed to a test unit. The test unit digitizes the received radio-frequency debugging signal to obtain a digital dataset and applies a back-propagation algorithm to the digital dataset for deriving a reconstructed near-field representation of the transmitting array. The reconstructed near-field representation is compared to a signal radiation reference template in order to detect a defective amplitude and/or a defective phase that is indicative of a defect in the transmitting antenna array and/or a device-under-test coupled to the transmitting antenna array. 1. A method comprising:receiving in a receiving antenna, a radio-frequency debugging signal transmitted by a transmitting antenna array, the receiving antenna located in a far-field region of the transmitting antenna array, the transmitting antenna array configured to propagate via the radio-frequency debugging signal, information indicative of a signal radiation distribution of the transmitting antenna array; and obtaining a digital dataset by digitizing the radio-frequency debugging signal received in the receiving antenna;', 'applying a back-propagation algorithm to the digital dataset to derive a reconstructed near-field representation of the transmitting antenna array, the reconstructed near-field representation indicating the signal radiation distribution of the transmitting antenna array; and', 'using the reconstructed near-field representation of the transmitting antenna array to identify at least one of: a) one or more defects in at ...

"ACCORDABLE LASER IN CONTINUOUS PHASE"

La présente invention concerne un laser accordable qui comprend un premier accordeur (210) configuré pour sélectionner une longueur d'onde d'émission du laser et un deuxième accordeur (215) configuré pour régler un mode de cavité du laser en modifiant la longueur de parcours optique de la cavité. Le deuxième accordeur (215) est limité par une plage d'accord finie. Le laser accordable comprend en outre une unité de contrôle configurée pour contrôler le premier (210) et le deuxième (215) accordeurs afin de sélectionner la longueur d'onde d'émission et de régler le mode de cavité de manière synchronisée, de sorte à réaliser un accord en phase continue sur une plage plus grande que celle supportée par la plage d'accord finie du deuxième accordeur. A tunable laser that includes a first tuner (210) configured to select a laser emission wavelength and a second tuner (215) configured to adjust a laser cavity mode by changing the path length optical cavity. The second tuner (215) is limited by a finite tuning range. The tunable laser further comprises a control unit configured to control the first (210) and second (215) tuners to select the transmit wavelength and to adjust the cavity mode in a synchronized manner, so as to performing a continuous phase chord over a range greater than that supported by the finite tuning range of the second tuner.

"ACCORDABLE LASER IN CONTINUOUS PHASE"

Self-monitoring light-emitting device

Selbstüberwachende Lichtquelle (110), die folgende Merkmale umfasst: eine Lichtquelle (120), die Licht (122) erzeugt; eine Lichtüberwachungseinrichtung (130), die einen Teil (132) des erzeugten Lichts empfängt und auf der Basis desselben ein Rückkopplungssignal (134) erzeugt, wobei die Lichtquelle (120) und die Lichtüberwachungseinrichtung (130) auf dem gleichen Halbleiterchip (310) hergestellt sind; und ein optisches Element (370), das in dem Halbleiterchip gebildet ist und einen Teil des erzeugten Lichts auf die Lichtüberwachungseinrichtung (130) richtet, – wobei die Lichtquelle (120) ein VCSEL (350) ist, der eine Apertur umfasst; – wobei die Lichtüberwachungseinrichtung (130) ein Ringformlayout (510) umfasst, das die Apertur entweder vollständig oder teilweise umgibt; – wobei das optische Element (370) ein zweidimensionales Gitter ist, das Licht auf vier Licht empfangende Stellen auf der Lichtüberwachungseinrichtung (130) richtet und – wobei das Ringformlayout (510) vier Ausschnitte aufweist, innerhalb derer von der Lichtüberwachungseinrichtung (130) kein Licht empfangen... Self-monitoring light source (110), comprising: a light source (120) that generates light (122); a light monitor (130) receiving a portion (132) of the generated light and generating therefrom a feedback signal (134), the light source (120) and the light monitor (130) being fabricated on the same semiconductor chip (310); and an optical element (370) formed in the semiconductor chip and directing a portion of the generated light to the light monitor (130), - wherein the light source (120) is a VCSEL (350) comprising an aperture; - wherein the light monitoring device (130) comprises a Ringformlayout (510), which surrounds the aperture either completely or partially; - wherein the optical element (370) is a two-dimensional grid, which directs light to four light receiving points on the light monitoring device (130) and - wherein the ring shape layout (510) has four cutouts within which no light ...

Devices and methods for extracorporeal ablation of circulating cells

Methods and devices are provided for the extracorporeal ablation of target cells circulating in blood of an organism. Exogenous material introduced into the blood preferentially associates with target cells (e.g. cancer cells, bacteria, viruses) in the blood. An extracorporeal continuous flow pathway accesses the patient's blood to apply an external energy source to the blood at an ex vivo ablation device in a portion of the extracorporeal continuous flow pathway. The exogenous material interact with the applied energy so as to result in the damage or death of the target cells. The blood is then returned to the body in a continuous-flow pattern. By applying the energy while the blood is in the ex vivo ablation device, shielding of the target cells by the body is reduced and detrimental effects on the organs and tissues of the body are avoided or mitigated.

Diffractive optical element for providing favorable multi-mode fiber launch and reflection management

A light transmission system includes a laser, an optical fiber, and a transfer lens. The transfer lens transfers light emitted by the laser into the optical fiber. The transfer lens includes a diffractive surface for receiving and collimating the light originating form the laser. The diffractive surface is defined by a surface function that includes a first phase function having angular symmetry and a second phase function having radial symmetry. The second phase function includes a cusp region with a discontinuous slope therein. The transfer lens provides reflection management so that light reflected from the end of the optical fiber is not focused at a location at which light is emitted by the laser and also favorable launch conditions so that light launched into the optical fiber avoids index anomalies along the axis of the optical fiber.

Apertured fiber optic stub for control of multi-mode launch condition

Disclosed are various embodiments of systems, devices, components and methods for launching high-transmission-rate optical communication signals into legacy fiber optic cables. At least one aperture is provided on a proximal end of single-mode fiber optic stub so as to block or otherwise control the propagation of unwanted light into and through the stub. In one embodiment, a low-cost spheroidal lens is mounted between the optical transmitter and the proximal end of the fiber optic stub to focus and direct light emitted by the optical transmitter towards the fiber optic stub. The relatively broad light beam formed by the low-cost lens, in combination with the aperture, removes the requirement to precisely align the transmitter, lens and stub with one another, and further does away with the conventional requirement to attenuate the amount of signal power provided to the fiber optic stub.

Diffractive optical element

Integrated parallel channel optical monitoring for parallel optics transmitter

Optisches System und Verfahren zur Detektion eines Leistungspegels einer Quelle

Integrierte, optische Parallelkanalüberwachung für parallele Optikensender

Für jeden Kanal in einem optischen Parallelkanal-Array umfaßt eine optische Beugungsanordnung (DOA) eine Eingangsregion, die zum Durchlassen eines ersten Teils eines Eingangsstrahls zu einer Ausgangsregion für Datenübertragungen und zum Beugen und Richten eines zweiten Teils einer Erfassungsregion zum Überwachen konfiguriert ist. Die Eingangsregion umfaßt die Beugungsmerkmale eines computererzeugten Hologramms (CGH) oder eines Beugungsgitters zum Beugen. Alternativ ist die Eingangsregion mit dem CGH oder dem Beugungsgitter gekoppelt. Ferner umfaßt die DOA mindestens eine Reflexionsregion zum Umleiten des zweiten Teils. Bei einem Ausführungsbeispiel umfaßt die DOA eine separate, aktive Oberfläche für jeden Kanal des Arrays. Alternativ weist die DOA eine einzige, aktive Oberfläche auf, die zum Interagieren mit allen Kanälen positioniert ist. Die optische Leistungsausgabe von dem zweiten Teil wird zum Erzeugen von Rückkopplungssignalen zum Einstellen des Eingangsstroms zu jedem Laser überwacht. Zusätzlich wird die optische Leistungsausgabe von der erfaßten Temperatur zum Erzeugen von Rückkopplungssignalen überwacht.

System and method for emulating echo signals for lidar sensor

A system is provided for emulating return optical pulses from at least one emulated target in response to a time of flight (TOF) lidar signal. The system includes an optical blocker configured to partially reflect or guide emitted optical pulses emitted by a TOF lidar sensor; a detector configured to detect the partially reflected or guided optical pulses, and to output corresponding electrical pulses; an electrical delay circuit configured to delay the electrical pulses to indicate distance to the at least one emulated target relative to the TOF lidar sensor; at least one laser configured to reemit return optical pulses in response to the delayed electrical pulses; a collimator configured to collimate the return optical pulses; and a diffuser configured to diffuse the collimated return optical pulses over a predetermined range of azimuthal angles toward the TOF lidar sensor.