353 results about "Extinction ratio" patented technology

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 discloses a near-infrared flexible polarized photoelectric detector and a preparation method thereof. The photoelectric detector comprises an Sb2Se3 micron wire, a PET flexible substrate, a metal Ag electrode, a silver wire and polydimethylsiloxane (a PDMS mixture). According to the preparation method, an effective metal-semiconductor-metal (M-S-M) structure is constructed by combining the Sb2Se3 micron wire and the Ag electrode, curing packaging is carried out by adopting a PDMS mixture, the incident light transmittance is improved, meanwhile, the response speed of a device can be greatly improved through ohmic contact formed by the micron wire and the Ag electrode, and the power loss of the device is remarkably reduced. Compared with the prior art, the detector provided by the invention still keeps a stable and high extinction ratio under mechanical bending deformation, and realizes sensitive polarization, quick response and stable performance of a near-infrared band at the same time.

The invention discloses an infrared polarization detector structure and a preparation method, and relates to the photoelectric detection technology, and the infrared polarization detector structure comprises a reading circuit (1) which is in inverted connection with an infrared material (2); one face of the infrared material (2) is connected with the reading circuit (1), array type polarization grating structures (4) are arranged on the other face of the infrared material (2), any polarization grating structure (4) forms a pixel, isolation groove structures (9) are arranged between the pixels on the infrared material (2), and the isolation groove structures (9) are filled with infrared isolation materials. According to the infrared polarization detector structure provided by the embodiment of the invention, the crosstalk of an infrared detector can be reduced, and the extinction ratio of the infrared polarization detector is improved.

The invention relates to the technical field of optical fiber communication, in particular to an FTTR modulation and test system which comprises an optical port modulation and test subsystem and a flow test subsystem. The optical modem test subsystem comprises a multi-channel optical modem test assembly and an extinction ratio tester; the multi-channel optical modem test assembly comprises an optical comprehensive test instrument, a one-to-two optical splitter, a clock data recovery instrument, an optical oscilloscope, a bit error tester and an upper computer. The N to-be-tested optical modems and the extinction ratio tester are electrically connected to the upper computer; the flow test subsystem comprises a network tester, OLT optical access equipment and a plurality of groups of flow test loops arranged between the network tester and the OLT optical access equipment, and each flow test loop comprises a first optical power meter, a first optical attenuator, an optical modem to be tested, a second optical power meter, a second optical attenuator and an accompanying optical modem. According to the invention, the production cost of the optical port debugging and testing process can be reduced.

The invention relates to the field of performance testing of high-precision fiber-optic gyroscopes, and discloses an automatic testing method and system for the extinction ratio of a high-precision fiber-optic gyroscope, and the method comprises the following steps: constructing a signal light path and a reference light path, and combining the output light of the signal light path and the reference light path into a combined light signal in an orthogonal polarization state; integrally measuring the extinction ratio of the combined optical signal by using an extinction ratio tester to obtain a measured value; the control unit compares the measured value with a target value of 0dB and generates a control instruction based on a difference value; the voltage controller automatically adjusts the voltage of the integrated optical modulator in the signal light path according to the instruction, and iterative optimization is carried out through closed-loop feedback until the actually measured extinction ratio reaches a target value; and finally recording and solidifying the optimal voltage value. According to the invention, single and accurate extinction ratio overall measurement is used for replacing two times of error-prone independent optical power measurement, full-automatic closed-loop control is realized, the precision, efficiency and consistency of optical power balance are remarkably improved, and the skill requirements on operators are reduced.

The invention relates to a photoelectric integrated double-frequency laser for coherent wind measurement, which comprises a first light source module, a second light source module, a first coupler module, a second coupler module, a third coupler module, a first beam splitter module, a second beam splitter module, a third beam splitter module and a first balanced photoelectric detector module, a second balance photoelectric detector module, a modulator module, an optical phase-locked loop module and a transceiver. Based on the silicon-based optoelectronic chip technology and the photoelectric hybrid packaging technology on the structural level, the coupler, the beam splitter and the photoelectric detector are integrated on the silicon optical chip, and the silicon optical chip, the DFB chip, the coupling optical path, the electrical module and the like are packaged together by utilizing the photoelectric hybrid packaging technology, so that high-density integration is realized; a heterodyne digital optical phase-locked loop technology is applied to a system level, so that a specific frequency difference exists between output signal light and reference light, and pulse light with a high extinction ratio is generated in a modulator cascading mode. Compared with a conventional single-light-source system scheme, the heterodyne Doppler wind measurement laser radar system can greatly improve the integration level, reduce the power consumption and the cost, and is beneficial to mass production, and compared with a homodyne detection mode, heterodyne detection is higher in measurement speed, simpler in scheme and better in stability. The system has extremely high expansibility, and can be applied to systems of optical fiber sensing, laser remote sensing and cold atomic clocks through operations of replacing a transmitting-receiving device, modifying a control program and the like.

To correct a measurement error of BFS by performing calculation of BFS on the basis of an extinction ratio of optical pulses.SOLUTION: An optical fiber sensor comprises: a light source section for generating probe light that is an optical pulse train; an optical coupler for branching probe light into two; an interference signal acquisition section for generating an interference signal by self-delay type heterodyne interference after rear Brillouin scattered light generated by an optical fiber measured by one probe light branched into two by an optical coupler is inputted; an extinction ratio measuring instrument for measuring an extinction ratio of the other probe light branched into two by the optical coupler; and signal processing means. The signal processing means includes: BFS calculation means for calculating a Brillouin frequency shift amount as a BFS measurement value from an interference signal; and extinction ratio correction means for correcting a BFS measurement value and obtaining a true BFS value on the basis of an extinction ratio measured by the extinction ratio measuring instrument.SELECTED DRAWING: Figure 1

The invention discloses a cascaded double-ring silicon optical modulator structure based on an Au1ter-Townes effect and a phase change material. The cascaded double-ring silicon optical modulator structure comprises a single-mode bus waveguide and two annular waveguides, a phase-change material is integrated on the surface of the annular waveguide to adjust the initial resonant wavelengths of the two micro-rings; pN junctions are integrated in the annular waveguide, and phase modulation of light is achieved through carrier injection. An Au1ter-Towns effect is utilized to enable a micro-ring transmission spectrum to form two split super-modes, and the extinction ratio corresponding to the two super-modes is changed by adjusting the resonant wavelengths of the double micro-rings; and meanwhile, the cascaded double-micro-ring structure can realize large modulation bandwidth and meet the high-speed transmission requirement. The micro-ring waveguide deposition phase-change material enables resonant wavelength tuning to have non-volatility, and compared with a traditional thermal tuning mode, the micro-ring waveguide deposition phase-change material can greatly reduce regulation and control power consumption. According to the invention, the technical bottleneck of the existing silicon optical modulator is overcome, and the practical application requirements of the fields of optical interconnection, optical communication, optical calculation and the like on the high-extinction-ratio high-speed modulator can be met.

The invention relates to an on-chip integrated polarization beam splitter which comprises a first multi-mode interference coupler, a second multi-mode interference coupler, a first waveguide and a second waveguide. The input end of the first multimode interference coupler is connected with the input waveguide, the first output end is connected with the first end of the first waveguide, and the second output end is connected with the first end of the second waveguide; the first input end of the second multimode interference coupler is connected with the second end of the first waveguide, the second input end is connected with the second end of the second waveguide, the first output end is connected with the first output waveguide, and the second output end is connected with the second output waveguide; the first waveguide and the second waveguide are the same in length and different in width, the first waveguide and the second waveguide are each provided with a thermo-optical phase shifter, and the thermo-optical phase shifters are used for conducting thermo-optical phase modulation so that the phase difference between TE polarization and TM polarization can be integer multiples of pi. According to the invention, the polarization extinction ratio can be improved.

The invention relates to a laminated staggered sub-wavelength polarization grating structure and a preparation method thereof, through staggered arrangement of a first metal grating layer and a second metal grating layer, transmission of polarized light of a transverse electric field can be effectively inhibited, and the extinction ratio is remarkably improved. Through the substrate, the first dielectric layer, the second dielectric layer, the first metal grating layer, the third dielectric layer and the second metal grating layer which are sequentially arranged from bottom to top, the whole device obtains a higher extinction ratio while keeping high transmittance, the overall structure is simple, the processing difficulty and cost are reduced, and the production efficiency is improved. And the number of the used dielectric layers and metal layers is small, the thickness requirement is low, and therefore it is ensured that the cost is controllable.

The invention discloses a feedback system for active polarization control of fiber laser and a non-polarization-maintaining fiber laser system, and relates to the field of fiber laser. The feedback system comprises an electric detection array sampling module, a calculation feedback module and a programmable gate array, the electric detection array sampling module extracts a fundamental mode component from a sampled main light beam, and N * N fundamental mode electric signals of the main light beam are obtained; the calculation feedback module inputs convergence parameters of the polarization convergence algorithm to the programmable gate array; and under the control of the calculation feedback module, the programmable gate array drives the non-polarization-maintaining fiber laser system to perform real-time polarization control by using a polarization convergence algorithm according to the feedback signal and the convergence parameter by taking the average value of the fundamental mode electric signals at the preset position in the N * N fundamental mode electric signals as the feedback signal. The polarization extinction ratio and the control bandwidth of polarization control can be improved.

The invention discloses an automatic adaptation method and device for an optical module and a switch, the optical module, a medium and a product, and relates to the technical field of optical communication, and the method comprises the steps: determining a port connected with the switch, recognizing a port identifier of the port, and querying a target voltage optical modulation amplitude value corresponding to the port identifier according to a preset mapping table; acquiring a current temperature value, and inputting the target voltage light modulation amplitude and the current temperature value into a preset fitting function to obtain target light power; and laser is emitted to the outside based on the target optical power, so that the extinction ratios of the laser at different ports and different temperatures are consistent. The adaptability and the performance stability of the optical module are improved.

The invention discloses a polarization sensitive type broadband absorber based on metal-medium stacking, and relates to the technical field of micro-nano photonic devices and infrared detection. The absorber sequentially comprises a bottom-layer high-loss metal reflecting layer, a multi-layer stacked composite dielectric cavity structure and a top-layer sub-wavelength metal grating from bottom to top, according to impedance matching and interference resonance theories, a broadband absorption substrate is constructed through a multi-layer film structure at the bottom, and light energy is converted into heat energy by utilizing the high loss characteristic of bottom layer metal; plasmon resonance is excited through the top metal grating, the coupling efficiency of TM polarized light is enhanced, and TE polarized light is cut off; the above structural design successfully realizes efficient broadband absorption and high polarization extinction ratio in an infrared band. The structure is simple in design, is compatible with a CMOS technology, and has excellent wide-angle stability. And meanwhile, polarization screening can be realized without an external polaroid, and miniaturization and integration of an infrared detection system are facilitated.

The invention discloses an extinction ratio measurement system and an extinction ratio measurement method, and relates to the technical field of optical module extinction ratio measurement. The transimpedance amplification circuit is connected with the optical module to be measured and used for monitoring the optical signal intensity of the optical module to be measured and obtaining a power monitoring voltage signal; decomposing the optical signal of the optical module to be tested to obtain a reference voltage signal and a test voltage signal; the linear output circuit is connected with the transimpedance amplification circuit and used for carrying out linear amplification on a difference value between the reference voltage signal and the test voltage signal to obtain a modulation amplitude voltage signal; and the processing circuit is respectively connected with the transimpedance amplification circuit and the linear output circuit, and is used for determining the light modulation amplitude according to the ratio of the power monitoring voltage signal to the modulation amplitude voltage signal, and determining the extinction ratio of the optical module to be detected according to the light modulation amplitude and the light power corresponding to the power monitoring voltage signal. The measurement cost of the extinction ratio of the optical module can be reduced.

The invention discloses an infrared polarization detector and device, and relates to the photoelectric detection technology. The detector chip (2) is electrically connected with the reading circuit (1) through an indium column (5), a polarization grating (4) is arranged on one surface, far away from the reading circuit (1), of the detector chip, and a pixel array structure (3) is arranged on the other surface, close to the reading circuit (1), of the detector chip; the relative positions of the pixel array structures (3) and the polarization gratings (4) are in one-to-one correspondence. Through the design of the n-type region of the polarization grating structure, the crosstalk of adjacent pixel signals can be blocked, so that the response value when the light transmission axes of the polarizer and the polarization grating are vertical is reduced, and the extinction ratio of the infrared polarization detector is improved.

The invention discloses a novel intermediate infrared double-core photonic crystal fiber polarization beam splitter based on aluminum wire filling, particularly relates to the technical field of photonic crystal fiber polarization beam splitters, and solves the technical problem that in the prior art, a compact photonic crystal fiber polarization beam splitter with a high extinction ratio and an ultra wide band in an intermediate infrared band is still scarce. According to the technical scheme, the optical fiber comprises two fiber cores and a cladding, wherein a cladding area is distributed in a hexagonal lattice mode; a plurality of circular air holes and two large circular filling holes are formed in the fiber core area, the distance between every two adjacent air holes is the same, the fiber core area comprises four small circular air holes and a central air hole, and the fiber cores are arranged in parallel and symmetrically distributed on the two sides of the central air hole. The As2S3 glass with high refractive index is used as a substrate material, aluminum is used as a metal filler, and the shortest length of 160 microns, the maximum extinction ratio of-72.1 dB and the operation bandwidth of 1020 nm are obtained at the mid-infrared band with the wavelength of 3.3 microns.

The invention provides a polarization insensitive 2 * 2 Mach-Zehnder optical switch based on a silicon nitride waveguide device. The silicon nitride waveguide layer comprises two optical input waveguides, two 2 * 2 bent waveguide type 3dB directional couplers, two symmetric Mach-Zehnder interference (MZI) arms and two optical output waveguides; two light input waveguides are respectively coupled with two input ports of a first 2 * 2 3dB directional coupler, through two paths of symmetrical MZI arms, a straight waveguide of one MZI arm is attached with a thermode to carry out optical signal phase modulation, output light of the two paths of MZI arms is input to a second 2 * 2 3dB directional coupler, so that the output light of the two paths of MZI arms is combined and interfered, and the output light of the two paths of MZI arms is output to the second 2 * 2 3dB directional coupler. And two paths of output waveguides are respectively led out. Based on the silicon nitride square waveguide and the 2 * 2 bent waveguide type 3dB directional coupler, the directional coupler has the advantages of being insensitive to polarization, large in bandwidth, low in insertion loss, high in extinction ratio and the like.

The invention discloses a thin-film barium titanate electro-optical switch unit based on a composite electrode and an array thereof. The optical switch unit comprises a first waveguide optical fiber coupling module, a second waveguide optical fiber coupling module, an optical beam splitting module, an electro-optical phase shift region, an optical beam combining module, a third waveguide optical fiber coupling module and a fourth waveguide optical fiber coupling module. Wherein the composite electrode of the electro-optic phase shift region is composed of a metal electrode and a transparent conductive layer, the electrode is closer to the waveguide by utilizing the transparent characteristic of a transparent conductive material, the coupling of a light field and an electric field is effectively enhanced, and the extinction ratio is improved. Meanwhile, a barium titanate film with a high electro-optical coefficient is adopted as a waveguide material, and the performance is further optimized, so that the electro-optical switch unit has the excellent characteristics of low-voltage driving, high extinction ratio, low insertion loss and small size.

An integrated configurable photodetector with an ultra-high circular polarization extinction ratio and a preparation method therefor are provided. The photodetector includes a metal reflective layer, a dielectric layer, an electrode layer, and a two-dimensional material layer. The electrode layer includes symmetrically arranged Z-shaped metallic optical antenna arrays which are respectively integrated with a source electrode and a drain electrode and have opposite chirality. The photodetector operates at zero bias state, and a photo-response is photovoltaic effect, hot electron injection, photo-thermoelectric effect and so on induced by a Schottky junction composed of the source electrode, the drain electrode and the two-dimensional material. By adjusting the distribution of the incident light in the source and drain electrode regions, under specific Circularly polarized light, photocurrents of equal magnitude but opposite directions cancel each other out, resulting in a net output of zero and significantly reducing noise.

The invention relates to the technical field of optical communication, and provides a polarization separation rotator and optical communication equipment. The polarization separation rotator comprises an input coupling waveguide, a ridge waveguide and a separation waveguide, and the input coupling waveguide, the ridge waveguide and the separation waveguide are sequentially arranged in the light propagation direction; the input coupling waveguide is used for coupling an input optical signal to the ridge waveguide, and the input optical signal comprises two polarization modes; the vertical section of the ridge waveguide is in a step shape to form a vertical asymmetric structure, and the vertical section is perpendicular to the light propagation direction. And the separation waveguide is used for separating the optical signals in the two polarization modes so as to respectively transmit the optical signals to different output ports. According to the polarization separation rotator provided by the invention, the defects that the size is difficult to further reduce and the polarization extinction ratio is reduced in the prior art are overcome, efficient polarization mode hybridization is realized by increasing the asymmetry in the vertical direction, and miniaturization of the polarization separation rotator is facilitated.

The invention relates to an inverse wavelength filter and a use method thereof. The inverse wavelength filter comprises a Lyot filter and a variable stress controller, wherein the Lyot filter consists of a polarization maintaining optical fiber with the length of 0.25 m and a polarizer with a high extinction ratio; the variable stress controller is connected with a section of polarization-maintaining tail fiber with the length of 0.05 m at the tail end of the polarization-maintaining optical fiber through a holder; the variable stress controller is used for continuously twisting and bending the polarization maintaining optical fiber; the distortion angle and the bending angle of the polarization-maintaining optical fiber are used for respectively controlling the central wavelength and the waveform left-right symmetry degree of an optical path passing through the polarization-maintaining optical fiber; the distortion angle and the bending angle of the polarization maintaining optical fiber are in linear relation with the driving current of the variable stress controller. According to the invention, spectral shape online correction of other optical paths such as fiber-optic gyroscopes can be realized.

The invention provides a polarization characteristic test method and test device for a semiconductor laser generating device. The method comprises the following steps: driving an electric rotating mirror group to rotate; recording a voltage signal output by the semiconductor light source corresponding to each rotation angle value; voltage signals output by the semiconductor laser generating devices are converted into laser power; correcting each laser power according to the rotation angle of the electric rotating mirror group; based on the corrected power of each laser, the corrected maximum laser power and the corrected minimum laser power are searched and obtained, and the polarization extinction ratio of the semiconductor laser generating device is calculated and obtained according to the corrected maximum laser power and the corrected minimum laser power; and in the polar axis coordinate system, drawing a polarization characteristic spectrum of the semiconductor light source according to the rotation angle of the electric rotating mirror group and the corrected laser power corresponding to the rotation angle. The semiconductor light source polarization characteristic testing efficiency is greatly improved, the constant error of the testing system can be eliminated by correcting the power of the laser, and the testing precision is improved.

The invention relates to the technical field of optical communication, in particular to a silicon optical chip monitoring method and device, electronic equipment and a computer readable storage medium, and the method comprises the steps: obtaining an input monitoring value and an output monitoring value integrated by a silicon optical chip, the input monitoring value is an input optical power value collected by an input monitoring photodiode integrated with the silicon optical chip, the output monitoring value is an output optical power value collected by an output monitoring photodiode integrated with the silicon optical chip, and a power ratio parameter is calculated according to the input monitoring value and the output monitoring value; the power ratio parameter is compared with a preset ratio range, and when it is detected that the power ratio parameter is not in the preset ratio range, it is determined that the silicon optical chip has an optical extinction ratio abnormal risk; and outputting a detection result containing the risk that the optical extinction ratio is abnormal, so that the real-time performance of abnormal detection of the optical extinction ratio of the silicon optical chip is improved.

A system for a waveguide-based diplexer (wavelength multiplexer / demultiplexer) and polarizer having ultra-broad bandwidth, a compact footprint, low losses, fabrication robustness and a simple single etch fabrication process. The polarizer (TE-pass) is based on the phase-matched coupling of the unwanted TM0 mode in an input waveguide to the TM1 mode in a tapered directional coupler (DC), which is then guided through a low-loss bend (180-degree) and scattered in a terminator section with low back reflections. An S-bend is added before the output for filtering any residual TM0mode present in the input waveguide. The diplexer is based on a multimode interference (MMI) coupler and is designed at the first imaging length for 1550 nm wavelength resulting in a compact MMI length. In order to improve the extinction ratio, the output ports are made asymmetric in width.

The invention provides a broadband infrared polarization device based on a mercurous halide crystal as well as a preparation method and application of the broadband infrared polarization device. The broadband infrared polarization device based on the mercurous halide crystal comprises a right-angle triangular prism based on the mercurous halide single crystal and a hexagonal prism based on the mercurous halide single crystal, and the mercurous halide is Hg < 2 > Cl2 or Hg < 2 > Br < 2 >. The mercurous halide crystal used in the invention is low in cost, can be prepared in a large size, and has stable physical and chemical properties; the transmission range of the infrared polarization device covers middle and far infrared bands, the transmission rate is high, and the birefringence is large; the polarization device based on the mercurous halide crystal can simultaneously realize polarization beam combination and beam splitting of visible-long wave infrared broadband, and has a high laser damage threshold, a high extinction ratio, high beam combination efficiency and high beam quality.

The invention belongs to the technical field of optical communication, and discloses an integrated power divider based on an X-cut thin-film lithium niobate waveguide and a preparation method thereof, wherein a buried oxide layer is placed on the substrate; a straight waveguide input region is placed on the buried oxide layer, one end of which is connected to the input end, and the other end is connected to the staggered wide waveguide region; the staggered wide waveguide region is placed on the buried oxide layer, one end of which is connected to the output end; a right-angle trapezoidal waveguide region is placed on the buried oxide layer, and a constant interval is maintained with the staggered wide waveguide region, and one end is connected to the oblique waveguide output region; the oblique waveguide output region is placed on the buried oxide layer, and one end is connected to the other output end; the straight waveguide input region, the staggered wide waveguide region, the right-angle trapezoidal waveguide region, and the oblique waveguide output region are all along the Y direction of the lithium niobate crystal axis; an insulating cladding is placed on the straight waveguide input region, the staggered wide waveguide region, the right-angle trapezoidal waveguide region, and the oblique waveguide output region; the invention has the advantages of large extinction ratio, small loss, high precision, small size, high bandwidth, large tolerance, and easy integration.

This invention discloses a bimetallic hybrid metasurface that achieves polarization-selective absorption and tunable liquid immersion. The metasurface consists of a three-layer structure: a bimetallic hybrid layer, a silicon dioxide layer, and a silver reflective layer. The bimetallic hybrid layer is composed of aluminum and titanium nanoribbons. The bimetallic hybrid metasurface achieves perfect absorption of incident light under x-polarized light at the resonant wavelength and specular reflection of incident light under y-polarized light, thus exhibiting a high extinction ratio. Furthermore, the absorption peak wavelength of the metasurface can be continuously and dynamically tuned by adjusting the unit period of the metasurface or by utilizing active tuning through liquid immersion. The bimetallic hybrid metasurface proposed in this invention achieves high-contrast polarization-selective absorption and possesses advantages such as simple structure, ease of integration, and dynamic tunability, thus it can be widely applied in practical applications such as novel optical polarizers and photodetectors.

The present invention discloses a lithium niobate thin film phase modulator heterogeneously integrated with silicon nitride, belonging to the field of integrated optical gyroscopes; comprising a substrate, a silicon dioxide cladding, a lithium niobate thin film-silicon nitride optical waveguide core layer, and a modulation electrode; wherein the optical waveguide core layer is a ridge structure, comprising a lithium niobate thin film layer, a silicon nitride layer, and a silicon nitride carrier strip, satisfying single-mode transmission conditions; the silicon nitride carrier strip constitutes a multimode interference coupler, a bending unit, and a modulation arm; the multimode interference coupler adopts a one-to-two structure with a splitting ratio close to 1:1; the ridge waveguide structure is used for light transmission, and the multimode interference coupler unit is used for light splitting; simultaneously, three modulation electrodes generate an electric field, causing the light transmitted in the two modulation arms to undergo phase changes, thereby outputting two beams of light with a certain phase difference. Polarization is achieved based on the different binding effects of the ridge waveguide on the TE mode and the TM mode, that is, the loss of the TE mode and the TM mode in the waveguide is different, achieving a high polarization extinction ratio.

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 present invention relates to the field of infrared imaging, and discloses a pixel structure, a manufacturing method thereof, and an uncooled infrared polarization detector, including: a pixel array, a packaging structure, and an optical isolator; the pixel array includes a plurality of pixels, the packaging structure is located above the pixels and packages the pixels; the packaging structure includes a packaging matrix layer and a micro-polarizer structure layer, the packaging matrix layer is connected to the pixels, and the micro-polarizer structure layer is located on the upper surface of the packaging matrix layer; the micro-polarizer structure layer has a nanowire grid structure; the optical isolator is located between two adjacent pixels. The present invention is provided with an optical isolator between adjacent pixels, which can effectively reduce or even eliminate the optical crosstalk between adjacent pixels, effectively improve the extinction ratio of the polarization detector, and thus obtain higher polarization detection accuracy.