43 results about "Polarization dependent" patented technology

The invention provides a metasurface structure and method for realizing transverse polarization focusing light splitting, and the metasurface structure comprises a substrate and a surface structure which is disposed on the substrate. The surface structure is composed of a plurality of sub-wavelength structure units which are arranged in a concentric circular ring mode. The sub-wavelength structure unit performs polarization-independent focusing of an incident beam through transmission phase regulation and control, and performs polarization-dependent light splitting of the incident beam through geometric phase regulation and control. The point diffraction plate can realize light beam splitting and focusing functions related to polarization, has the advantages of being simple in structure and high in integration level, solves the technical problems that an existing point diffraction plate does not support synchronous phase-shifting interference measurement and the contrast ratio of interference fringes is low, and enables the contrast ratio of the interference fringes of point diffraction interference measurement to be higher, the resolving precision to be higher and the resolving speed to be higher.

The invention discloses a parameter measuring device and method of an optical switch and optical communication equipment, and relates to the technical field of optical switch measurement, and the parameter measuring device of the optical switch comprises an optical path module, a signal conditioning circuit, a driving module, a signal acquisition module and an upper computer. The optical path module converts the optical signal into a current signal; the signal conditioning circuit conditions the signal into a voltage signal and amplifies the voltage signal; the driving module provides a driving signal and a synchronous triggering signal; the signal acquisition module acquires a voltage signal based on the trigger signal; the upper computer calculates performance parameters of the optical switch according to the voltage signals acquired for multiple times, wherein the performance parameters at least comprise two items of insertion loss, extinction ratio, switching time and the like; according to the technical scheme, one-key measurement of performance parameters such as insertion loss, extinction ratio, switching time, polarization-dependent loss, insertion-dependent loss and repeatability of the optical switch can be realized, meanwhile, the measurement cost of the optical switch is reduced, and the test efficiency and accuracy are improved.

The invention relates to the technical field of optical fiber device manufacturing, and discloses a femtosecond laser inscribing low-polarization-dependent-loss optical fiber grating method and system, and the method comprises the steps: firstly, synthesizing an initial phase comprising a flat-topped beam phase, an astigmatism correction phase and a defocus phase, and loading the initial phase to a spatial light phase modulator; therefore, a preset circular flat-top focusing light spot is generated. Secondly, collecting a three-dimensional light field image sequence of a focusing light spot in a low-power detection mode, reconstructing light intensity distribution, extracting effective focal depth and ovality characteristic parameters, dynamically optimizing a phase through a closed-loop feedback mechanism until light field characteristics reach a preset target, and obtaining an optimized phase; and finally, loading an optimized phase in a high-power inscribing mode, and controlling the axial scanning of the optical fiber to inscribe the grating. Accurate active regulation and control of the three-dimensional shape of the focused light field and closed-loop self-optimization of process parameters are realized, birefringence caused by anisotropy of a refractive index modulation area is inhibited from a physical mechanism, and polarization dependent loss of the fiber bragg grating is fundamentally reduced.

The invention provides an all-fiber ultrafast laser based on 1.7 micron high energy. The all-fiber ultrafast laser comprises a pumping source, a wavelength division multiplexer, a gain fiber, a band-pass filter, an output coupler, a single-mode fiber, a first three-ring polarization controller, a polarization dependent isolator and a second three-ring polarization controller. The output end of the pumping source is connected with the wavelength division multiplexer, the output end of the wavelength division multiplexer is connected with the band-pass filter through the gain fiber, the output end of the band-pass filter is connected with the output coupler, and the first output port of the output coupler is connected with the input end of the first three-ring polarization controller through the single-mode fiber. A second output port of the output coupler is used as the output of the all-fiber ultrafast laser, the output end of the first three-ring polarization controller is connected with the polarization dependent isolator, the output end of the polarization dependent isolator is connected with the second three-ring polarization controller, and the output end of the second three-ring polarization controller is connected with the wavelength division multiplexer.

The invention discloses a broadband spectrum all-fiber femtosecond laser system based on chirped pulse amplification and an adjusting method of the broadband spectrum all-fiber femtosecond laser system. The broadband spectrum all-fiber femtosecond laser system comprises a broadband spectrum dissipative soliton mode-locked fiber laser and an all-fiber chirped pulse amplifier which are connected. The broadband spectrum dissipative soliton mode-locked fiber laser comprises a first pumping source, a first wavelength division multiplexer, a first gain fiber, a first polarization controller, a polarization dependent isolator, a second polarization controller and a coupler. The all-fiber chirped pulse amplifier comprises a first polarization independent isolator, a dispersion compensation fiber, a second wavelength division multiplexer, a second gain fiber, a third wavelength division multiplexer, a single-mode fiber, a second polarization independent isolator, a second pumping source and a third pumping source. The system realizes the wide spectrum characteristic through the optical fiber length adjusting module, the spectrum adjusting module and the fine adjusting module. The device is simple in structure, wide in application scene, not prone to pulse distortion, wide in spectrum and high in anti-interference capacity.

The application discloses a kind of parameter measuring device of optical switch and method, optical communication equipment, it is related to optical switch measurement technical field, the parameter measuring device of optical switch includes optical path module, signal conditioning circuit, drive module, signal acquisition module and host computer;Optical path module converts optical signal into current signal;Signal conditioning circuit is conditioned as voltage signal and amplifies;Drive module provides driving signal and synchronous trigger signal;Signal acquisition module is based on trigger signal and collects voltage signal;Host computer calculates the performance parameter of optical switch according to voltage signal collected multiple times, and performance parameter at least includes two items in insertion loss, extinction ratio, switching time etc.;The technical scheme of the application can realize the one-key type measurement of the performance parameter such as insertion loss, extinction ratio, switching time, polarization dependent loss, insertion dependent loss and repeatability of optical switch, while reducing the measurement cost of optical switch, improve test efficiency and accuracy.

The application provides a polarization-dependent reflective two-stage optical ring, which comprises a first collimator, a first beam splitting cube, a first optical rotation component, a second beam splitting cube, a third beam splitting cube of a second optical rotation component and a second collimator arranged along a first optical path, and three beam splitting cubes are respectively light splitting dielectric films; the application combines the characteristics of a transmission two-stage ring and a reflective ring, two optical rotation components are arranged on the first optical path from the first collimator to the second collimator, thereby realizing the series connection of two isolation systems, playing a double-stage isolation effect, meanwhile, the application realizes the optical path folding of a second optical path from the second collimator to the third collimator by using a reflective component, and optical components are multiplexed in one of the optical rotation components, thereby also achieving a double-stage isolation effect; while realizing the double-stage isolation effect, the application also reduces the product volume, is beneficial to the integration of equipment and is also beneficial to cost reduction.

An eyewear device includes a lightguide having a world-side surface and an eye-side surface, a display oriented to emit light toward the lightguide, and a beam steering element that includes a first polarization grating positioned along an optical path between the display. The first polarization grating diffracts light emitted by the display into orders having different polarizations and the orders are selectively conveyed into different eyeboxes. The eyewear device also includes a frame that supports the lightguide, the display, and the first polarization grating. In some cases, the different polarizations include a right circular polarization or a left circular polarization and the beam steering element includes a polarization dependent filter that filters right circularly polarized light in a first state and left circularly polarized light in a second state.

The disclosed systems and methods are for reducing polarization dependent loss in an optical link including: i) changing, by a state of polarization (SOP) controller, an SOP of an optical signal propagating in the optical link; ii) computing, by a link controller, a polarization dependent loss (PDL) in a portion of the optical link; iii) generating, by the link controller, a control signal according to the PDL; and iv) based on the control signal, changing, by the SOP controller, the SOP of the optical signal.

An optical property evaluation device 20 according to the present disclosure comprises: a test light generation unit 30 that generates test light; an input / output unit 40 that inputs the test light from one end of an optical fiber 10 under test in any polarization state, and acquires and outputs, from the one end, backscattered light from each point of the optical fiber 10 under test; a backscattered light complex electric field amplitude acquisition unit 50 that acquires, for each point of the optical fiber 10 under test, a complex electric field amplitude of the backscattered light output from the input / output unit 40; and an arithmetic processing unit 60 that converts the complex electric field amplitude into a matrix for each point of the optical fiber 10 under test, and evaluates polarization dependent loss using a singular value of the matrix.

A system and method for implementing a Variable Optical Attenuator (VOA) for high optical power handling. The VOA device may include an optical signal attenuation element with a fixed optical path to dump unwanted optical light to a light absorption material. The light absorption material may be thermally managed for reliability. The VOA device may support input light beams having any polarization state or composites of both P and S light. An embodiment of the present invention is directed to managing P light and S light through the VOA device to travel within a same optical path length to minimize Polarization Mode Dispersion (PMD). In addition, P and S polarization beams may be independently attenuated to minimizes Polarization Dependent Loss (PDL).

The invention relates to the technical field of optical communication devices, in particular to a multi-channel variable optical attenuator and a manufacturing method thereof, the multi-channel variable optical attenuator comprises a multi-channel variable optical attenuator photoelectric structure, and each variable optical attenuator photoelectric structure comprises an optical path structure and a heating circuit; wherein the optical path structure comprises an upper modulation optical waveguide and a lower modulation optical waveguide; one side of the upper modulation optical waveguide and one side of the lower modulation optical waveguide are jointly connected with an input bent optical waveguide, and the other side of the upper modulation optical waveguide and the other side of the lower modulation optical waveguide are jointly connected with an output bent optical waveguide. The heating circuit is arranged on the light path structure and comprises a heating electrode and electrode leads arranged at the two ends of the heating electrode. According to the invention, the optical crosstalk generated by stray light formed by light leakage at the input end to adjacent channels can be reduced, so that the performance of the device can be improved, such as polarization dependent loss and optical crosstalk reduction.

The invention discloses a digital domain distributed polarization dependent loss (PDL) measurement method in an optical network. The method comprises the following steps: obtaining an output optical signal of a section of link based on the polarization state (SOP) of an input optical signal of the section of link and the polarization dependent loss of the section of link; scanning the SOP to obtain a plurality of scanning polarization states, and respectively applying the obtained scanning polarization states to the input optical signal of the section of link; calculating a power side write value of the optical signal obtained after the scanning polarization state is applied each time by using a longitudinal power monitoring (LPM) technology based on a related method; calculating a polarization-dependent loss value, a corresponding azimuth angle and a phase angle of the section of link; calculating the SOP of the input optical signal of the section of link; and repeating the steps to measure the polarization dependent loss of the section of link until the polarization dependent loss is transmitted to the front of the receiving end. According to the invention, high-precision and high-stability monitoring of the distributed PDL is successfully realized, fitting of a large amount of data is not needed, and the method has the advantages of flexibility, real-time performance and low cost.

A bioreactor monitoring device and method configured for in-situ or ex-situ analysis is provided. The monitoring system (5) includes a tunable laser spectrometer (8) that generates a swept wavelength signal and transmits it through an optical fiber (110), a reference light detection means (158) that detects the swept wavelength signal after transmission from the tunable laser spectrometer (8) through the optical fiber (110), and a sample light detection means (132) that detects the swept wavelength signal after transmission through a sample detection region (12). The polarization means (152) and the reference light detection means (158) that detects the swept wavelength signal before transmission through the sample detection region (12) from the tunable laser spectrometer (8) through the optical fiber (110) address noise resulting from polarization dependent loss.

The utility model relates to the technical field of circulator bodies, in particular to a device for improving crosstalk of a polarization dependent circulator, which comprises a circulator body, the outer side of the circulator body is connected with three ports which are respectively a port I, a port II and a port III, an inner cavity is formed in the circulator body, the inner cavity is polygonal, and the outer side of the circulator body is connected with the port II. A first polarization beam splitter, a Faraday rotation piece, a half-wave plate and a second polarization beam splitter are sequentially arranged in the inner cavity in the direction from the first port to the second port, and an inclined face is arranged on the side wall in the inner cavity. According to the device for improving crosstalk of the polarization dependent circulator, the black coating opposite to the second polarization beam splitter and the first polarization beam splitter is arranged at the inclined plane in the inner cavity, so that fast-axis optical signal interference of an input signal can be effectively inhibited, and fast-axis light from the second polarization beam splitter can be prevented from returning to a port III again; by suppressing and isolating unnecessary optical signals, mutual interference between ports can be reduced, and the stability and reliability of the whole optical system can be improved.

The invention discloses a polarization dependent loss test method based on extruded optical fibers. The method comprises the following steps: connecting a polarization dependent loss test optical path of a to-be-tested piece; roughly searching an extreme point in a polarization state in a large-step manner; an extreme point is accurately found through curve fitting; and substituting an accurate extreme point searched by curve fitting into a formula to calculate a polarization dependent loss value. The invention provides a polarization dependent loss test method based on an extruded fiber, and the method comprises the steps: employing an extreme value searching and local fitting mode, and carrying out the testing of the polarization dependent loss; firstly, the approximate extreme point of the power curve corresponding to the polarization state is found, then the power point is selected near the extreme point for curve fitting, and the accurate extreme point is found through the fitted curve, so that the measurement accuracy is greatly improved, and the measurement speed of the polarization dependent loss is improved.

Examples relate to a method of operating a first communication node (CN). The first CN is configured for controlling a re-configurable relaying device (RRD), in particular a re-configurable reflective device, the RRD being reconfigurable to provide multiple contemporaneous spatial polarization filterings, each one of the multiple spatial polarization filterings being associated with a respective input spatial direction from which incident signals on a radio channel are accepted and with a respective output spatial direction into which the incident signals are transmitted, in particular reflected, by the RRD. The method comprising providing, to a second CN, a message indicative of the RRD being configurable to transmit an incident signal from a second CN using an output spatial direction to the first CN depending on a property of the incident signal. Further examples, relate to methods of operating the second CN and the RRD. Still further examples, relate to corresponding first CNs, second CNs and RRDs.

The invention provides an AWG optical module based on a wavelength allocation algorithm, and relates to the technical field of AWG optical modules. Quartz and silicon dioxide with the same thermal expansion coefficient are respectively used as a substrate and a cladding when the AWG optical module is processed and used; oxide phosphorus pentoxide and diboron trioxide are doped into the cladding, so that the expansion coefficient of array guided waves with the wave spacing of 1-5 microns at the joint of flat guided waves is increased to 2.42 * 10 <-6 > / DEG C, and the polarization dependent wavelength WPD of the waveguide at the joint can be reduced to be within 0.05 nm; the thermal expansion coefficients of the quartz substrate and the undoped silicon dioxide cladding are the same, so that the WPD of the whole AWG device can be optimized to be within 0.05 nm, the polarization-dependent wavelength is reduced, and the performance optimization use of the AWG optical module is achieved.

The utility model provides a double-ridge-shaped end face coupler based on a thick silicon platform. The double-ridge-shaped end face coupler comprises a substrate and a coupling waveguide structure. The substrate comprises a bottom silicon layer and a buried oxide layer, and a coupling waveguide structure is arranged on the buried oxide layer; the coupling waveguide structure comprises a double-ridge-shaped inverted-cone waveguide and a strip-shaped waveguide which are connected with each other. By adopting the thick silicon platform, the polarization dependent loss can be reduced; by adopting the double-ridge inverted-cone waveguide, the unification of low loss and high tolerance can be obtained; in addition, the coupler can be processed based on an SOI wafer, the device is of a single-layer silicon design, additional multi-layer manufacturing is not needed, the photoetching and etching cost can be saved, the process is simple, and the coupler is good in compatibility with a CMOS (Complementary Metal-Oxide-Semiconductor Transistor) platform.

The invention provides a light generating system (1000) comprising a light generating device (100), a luminescent material layer (200), and optics (400), wherein: (I) the light generating device (100) is configured to generate polarized laser radiation (101); (II) the luminescent material layer (200) comprises a luminescent material (210) configured in a light-receiving relationship with the light generating device (100) and configured to convert at least part of the polarized laser radiation (101) into luminescent material radiation (211); (III) the light generating system (1000) is configured to generate in an operational mode system light (1001) at least comprising the luminescent material radiation (211); (IV) the optics (400) comprise first optics (410) and second optics (420); wherein the first optics (410) are configured to change the polarization of the polarized laser radiation (101), and wherein the second optics (420) have one or more of (i) a polarization dependent transmission and (ii) a polarization dependent reflection for the polarized laser radiation (101); and (V) the light generating device (100) and the optics (200) are configured such that, relative to an optical path of the luminescent material radiation (211) emanating from the luminescent material (210), the second optics (420) are configured downstream from the first optics (410) and the luminescent material (210).

Systems, apparatuses, and methods for an electronic display are disclosed. More specifically, the invention and disclosure relates to an electronic display that has a diffuse, paper-like reflectance characteristic for visible light, while being retroreflective and non-diffuse for infrared light, for easy image detection and analysis with infrared cameras, while preserving viewing properties of an electronic paper display for humans.

The application provides a kind of to realize transverse polarization focusing spectrometer super surface structure and method, including substrate, also include surface structure, the surface structure is arranged on the substrate;The surface structure is composed of multiple concentric ring arrangement subwavelength structure unit;The subwavelength structure unit carries out polarization independent focusing of incident light beam by transmission phase control, and the subwavelength structure unit carries out polarization dependent spectrometer of incident light beam by geometric phase control.The application can realize polarization dependent beam spectrometer and focusing function, with the advantages of simple structure, high integration, solve the technical problems that present point diffraction plate does not support simultaneous phase shift interferometry and interference fringe contrast is low, make the interference fringe contrast of point diffraction interferometry higher, higher, higher, faster.

The invention relates to the technical field of optical detection, in particular to a magneto-optical testing system and method based on polarized light excitation and detection. The invention provides a magneto-optical test system based on polarized light excitation and detection. According to the testing system, polarization excitation of a white light path and a laser light path is achieved through a multi-light-path light splitting means, a spectrograph and a detector are integrated, temperature, electric field and magnetic field control is coupled, and single-point detection and scanning imaging testing of polarization absorption spectrum, polarization dependent photoelectric response, magneto-optical Kerr, Faraday rotation effect and the like under external excitation are achieved.

The invention discloses an intelligent mode-locking fiber laser with a tunable central wavelength and an intelligent mode-locking method, and relates to the technical field of lasers, the laser comprises a pumping source, a wavelength division multiplexer, a gain fiber, an intelligent mode-locking effect component, an output component, a spectrum analyzer and a computer terminal which are connected in sequence; the output component is also connected with the transmission end of the wavelength division multiplexer; the intelligent mode-locking effect assembly comprises a first electronic polarization controller, a polarization dependent isolator, a polarization maintaining optical fiber and a second electronic polarization controller which are connected in sequence. And the computer end is used for gradually adjusting the control voltages of the first electronic polarization controller and the second electronic polarization controller according to the central wavelength and bandwidth of the spectrum output by the spectrum analyzer by using a reinforcement learning method so as to realize mode locking at the target central wavelength. According to the invention, the mode-locked fiber laser realizes automatic mode locking at the required central wavelength through the intelligent mode-locking method.

Provided is a compact optical amplifier in which the polarization dependent gain of an SOA can be eliminated and the number of optical components is small. Specifically, provided is an SOA-integrated optical amplifier circuit (200) comprising a planar lightwave circuit (201) and a plurality of semiconductor amplifiers (SOAs) (203, 205) integrated on the same substrate, the SOA-integrated optical amplification circuit (200) characterized by comprising a plurality of SOAs (203, 205) that amplify light, a polarization separation unit (207) that separates incident light into independent first light in a first mode and second light in a second mode, a first polarization rotation unit (203a) that converts the first mode of first light separated by the polarization separation unit (207) to the second mode, a second polarization rotation unit (203b) that converts the second mode of the first light amplified by the first SOA (203) to the first mode, and a polarization multiplexing unit (209) that multiplexes the amplified light.

An optical device for polarization dependent loss compensation and a polarization controlling wavelength selective switch (PC-WSS). The device includes a polarization independent liquid crystal on silicon (PI-LCoS) structure, a first liquid crystal structure disposed on the PI-LCOS structure; and a second liquid crystal structure disposed on the first liquid crystal layer, the two liquid crystal structures having a common ground electrode. The PI-LCOS structure includes a metamaterial quarter-wave plate (QWP) disposed over a silicon substrate. The PC-WSS includes an optical assembly arranged to receive light from a fiber array unit; a polarization-insensitive grating structure optically aligned with the optical assembly; and the optical device for polarization dependent loss compensation optically aligned with the polarization-insensitive grating structure.

The invention discloses a visible light communication method and an underwater cleaning system. The method comprises the following steps: inserting a multi-orthogonal polarization pilot frequency in a frame starting region and adaptively setting pilot frequency energy according to the power of a previous frame; synchronously sampling the current of each light receiving surface, and obtaining a Stokes vector according to pilot frequency separation and normalization; calculating polarization dependent loss of each surface, weighting to obtain global loss, and comparing the depolarization degree with a statistical threshold to generate a compensation parameter; adjusting the polarization mapping of the uplink and verification channels according to the compensation parameters and redistributing the transmitting power; and carrying out trend prediction on global loss, sending out local heating and chemical cleaning instructions when maintenance conditions are met, and recording loss and configuration. According to the technical scheme, the polarization loss can be inhibited in the running process of the chlorine-containing swimming pool, the link symmetry is kept, and the continuous working time of the robot is prolonged.

The application provides a polarization-dependent device and an optical fiber laser, wherein self-made polyester transparent adhesive is used as a transmission tool, tantalum palladium sulfide is accurately placed in the center of the end face of an optical fiber jumper under a microscope, and the tantalum palladium sulfide is connected with another optical fiber jumper by using an optical fiber sleeve to form the polarization-dependent device. The tantalum palladium sulfide has excellent nonlinear polarization optical response, under the condition that the input pump power is constant, the polarization-dependent device based on the tantalum palladium sulfide can realize stable soliton and noise-like dual-mode controllable switching in a single superfast optical fiber laser. In a single superfast optical fiber laser system, the controllable stable switching of different superfast laser pulse modes has great expansion application potential. The polarization-dependent device based on the tantalum palladium sulfide in the application has simple structure, simple preparation and low cost, and has good nonlinear optical performance and long-term working stability.

The application provides a phase-sensitive optical time domain reflectometer, which comprises a polarization diversity receiving module, an amplification circuit and a signal acquisition and processing unit; a controller of the polarization diversity receiving module can adjust a first transimpedance amplifier, a second transimpedance amplifier and a gain multiple of the amplification circuit according to first photodetector information and the like sent by the signal acquisition and processing unit, so that the total gain of X-state electric polarization signals and Y-state electric polarization signals output by the amplification circuit is consistent, the problem of original output power imbalance is overcome from the perspective of ensuring responsivity and amplification multiple, then a polarization compensation coefficient is generated according to a preset rule to compensate for power imbalance caused by the polarization diversity receiving module manufacturing process. The application further discloses a method for eliminating polarization-dependent loss.

A method includes separating, by a polarization splitter rotator, an input light signal into a first light signal having a first insertion loss and a second light signal having a second insertion loss that is different than the first insertion loss; and attenuating, by an optical attenuator, the first light signal or the second light signal in order to compensate for a polarization dependent loss between the first light signal and the second light signal such that a total optical power of the first light signal and the second light signal is independent of a polarization state of the input light signal.