111 results about "Polarization rotator" patented technology

The utility model provides a reflection type polarization rotator which comprises a reflection bottom plate, a dielectric layer and a metal patch, the reflection bottom plate is used for reflecting electromagnetic waves, the dielectric layer is arranged on the upper surface of the reflection bottom plate, the metal patch is arranged on the upper surface of the dielectric layer, and the horizontal section of the metal patch is of a structure shaped like a Chinese character'wang '. And the center line of the structure shaped like the Chinese character'wang 'is inclined to the horizontal polarization direction and the vertical polarization direction. The reflection type polarization rotator provided by the utility model has wider working bandwidth and higher polarization conversion efficiency, and is simple in structure and more convenient to process and apply.

An optical circuit is used with continuous wave signals having different wavelengths at a channel spacing from one another. A portion of the optical circuit is implemented in a photonic integrated circuit. Modulators in a modulation stage modulate the continuous wave signals to produce modulated signals. A multiplexing stage, which can have multiplexing filters, power combiners, or power couplers, multiplexes the continuous wave or modulated signals to produce multiplexed signals. The multiplexing stage may be placed either before or after the modulation stage. One or more polarization rotator and combiner (PRC) devices in a final stage combines the multiplexed signals into an output signal. The output signal has a first set of the different wavelengths at a first polarization and has a second separate set of the different wavelengths at a second polarization orthogonal to the first polarization.

The invention discloses an optical up-conversion, optical fiber transmission and self-interference elimination integrated device and method. The invention discloses an optical up-conversion, optical fiber transmission and self-interference elimination integrated device which comprises a central station, a transmission medium and a far-end base station. Wherein the central station comprises a first wavelength tunable laser (1), a local oscillator signal generator (2), a second wavelength tunable laser (3), a first double-parallel Mach-Zehnder modulator (4), an electric power divider (5), a second double-parallel Mach-Zehnder modulator (6), a 90-degree polarization rotator (7) and a polarization beam combiner (8). And a transmission medium adopts a single-mode optical fiber (9). The far-end base station comprises an optical power amplifier (10), a polarization beam splitter (11), a first photoelectric detector (12), a second photoelectric detector (13), an electric power amplifier (14), a transmitting antenna (15) and a receiving antenna (16). The invention further provides an optical up-conversion, optical fiber transmission and self-interference elimination method. According to the invention, the influence of the up-conversion transmission signal on the signal received by the far-end base station can be eliminated, the transmission quality of the received signal is improved, and the base station is simplified.

The present disclosure is directed to a dual laser transceiver system. The dual laser transceiver system may comprise a dual laser, with the dual laser further comprising a first laser chip and a second laser chip, a polarization rotator and a polarization combining beam splitter. The dual laser may be coupled to a photonic integrated circuit that may comprise a polarization rotator and splitter operable to general a local oscillator and a modulator signal.

The invention discloses a polarization rotator and a manufacturing method thereof. The polarization rotator comprises a first waveguide, a first coupling waveguide, a mode conversion waveguide, a second coupling waveguide and a second waveguide which are sequentially connected in a first direction, the first waveguide is used for introducing external first mode polarized light; the first coupling waveguide is used for coupling the first waveguide and the mode conversion waveguide; the mode conversion waveguide is used for converting the first mode polarized light guided by the first waveguide into second mode polarized light, and the mode conversion waveguide has geometric asymmetry in a first direction; the second coupling waveguide is used for coupling the mode conversion waveguide and the second waveguide; the second waveguide is used for exporting the second mode polarized light converted by the mode conversion waveguide; wherein the first direction is a light propagation direction. According to the polarization rotator and the manufacturing method thereof, the device structure can be effectively shortened, and meanwhile efficient conversion rate is achieved.

A device for beam shaping of a laser beam includes a prism, a polarization rotator, and a thin-film polarizer. The prism is configured to split an incident laser beam into a first beam half and a second beam half. The first beam half is input coupled into the prism. The first beam half enters the prism at a first incidence side arranged at the Brewster angle vis-à-vis the incident laser beam. The first beam half input coupled into the prism is output coupled from the prism at an exit side of the prism at the Brewster angle. The thin-film polarizer is traversed by the first beam half output coupled from the prism. The polarization rotator rotates a polarization of the second beam half. The second beam half is reflected by the thin-film polarizer. The thin-film polarizer superimposes the first beam half and the second beam half.

The present application relates to a reconfigurable port array for a wavelength selective switch. A reconfigurable polarization rotator is formed by an array of very small liquid crystal (LC) cells (e.g., cells with a width less than 10 μm, referred to as "microcells"), which are hereinafter referred to as "microcells". Each LC microcell can be addressed by an independent voltage input, which independently controls the polarization rotation performed by the associated LC microcell. By defining a group of adjacent microcells to be maintained at the same voltage level, the group can be used to form a polarization rotator window of appropriate size for a first fiber array configuration. When a fiber array of a different configuration is used (e.g., an array with twice the pitch), a group of adjacent LC microcells of different sizes are maintained at a common voltage level to form a reconfigured "window" of new size.

Embodiments of the present disclosure relate to a polarization rotator (200A, 200B) and a communication device (2800) comprising the polarization rotator (2802). In an aspect, the polarization rotator (200A, 200B) comprises a first portion (202, 208); and a second portion (204, 210) connected to the first portion (202, 208), wherein the first portion (202, 208) and the second portion (204, 210) are of (i) a first shape (406) with a contour of a spline curve or (ii) a second shape (1732) formed by combining a partial rectangle (1740) and a plurality of partial circles (1734, 1736, 1738) with different radii. The polarization rotator is more effective, and can allow for better bandwidth control and significantly improved impedance matching.

The invention belongs to the field of photoelectric chips, and provides a low-loss silicon nitride optical engine chip for a triaxial fiber-optic gyroscope. The chip comprises an end face coupling area, a polarization rotation area and a beam splitting area, a low-polarization light beam from a light source is transmitted to the end face coupling area through the single-mode optical fiber and is transmitted to the silicon nitride waveguide through the input end face coupler, a TM0 mode of the silicon nitride waveguide is output and converted into a TE0 mode by the cross end of the polarization beam splitter through the polarization rotator, and the TM0 mode and a TE0 mode output by the straight-through end of the silicon nitride waveguide are combined in the heat insulation beam combiner. And the combined light is transmitted to the beam splitting area and is output through output end face couplers in the beam splitting area and the end face coupling area. Through the mode, efficient conversion from a non-working polarization mode to a main mode and high-efficiency, low-loss and high-stability light path connection are realized, inherent polarization loss of-3dB is avoided fundamentally, and a feasible scheme of an integrated, low-power-consumption and high-performance fiber-optic gyroscope is provided.

A line monitoring system can include a laser source to emit a probe signal over a first bandwidth; a polarization preserving tap to receive the probe signal and split the probe signal into a first portion and a second portion; a polarization rotator to receive the first portion and send the first portion to a transmission system; a loop tap to receive the second portion and receive a loop signal from the transmission system, wherein the loop signal is derived from the first portion; a photodetector coupled to receive an interference signal from the loop tap, wherein the interference signal is generated by mixing the loop signal with the second portion, wherein the photodetector is arranged to output a power signal based on the interference signal; and a power measurement system to measure the power signal over a second bandwidth comparable to the first bandwidth at a given measurement frequency.

A polarizer system is described. The polarizer system comprises at least one polarization beam splitter, a polarization rotator, and a beam combiner. The at least one polarization beam splitter is positioned to receive input radiation beam and to split the input radiation beam directing a first beam portion having a first linear polarization orientation along a first path and a second beam portion having a second linear polarization orientation orthogonal to said first linear polarization orientation along a second path. The polarization rotator is located along said second path and configured to rotate polarization of said beam portion to be parallel to said first linear polarization orientation. The beam combiner is configured and positioned to combine said first and second beam portions to form a common beam having said first linear polarization orientation propagating along a selected optical path.

A high extinction-ratio rotator includes a collimator that can collimate a signal light from an optical fiber, a pair of polarizing splitting prisms that include a first birefringence crystal wedge and a second birefringent crystal wedge, that can separate two orthogonal polarization components of the signal light into a vertically polarized light and a horizontally polarized light, a non-reciprocal 45-degree polarization rotator which the vertically polarized light and the horizontally polarized light exiting the pair of polarizing splitting prisms pass through, and a reflector. The vertically polarized light and the horizontally polarized light exiting the non-reciprocal 45-degree polarization rotator intersect on a surface of the reflector and are reflected back into the non-reciprocal 45-degree polarization rotator.

The invention provides a polarization rotator based on a sub-wavelength grating, relates to the technical field of integrated photonics, and can solve the problem that a silicon waveguide in a silicon oxide cladding is difficult to realize modal signal conversion. The polarization rotator based on the sub-wavelength grating comprises a silicon substrate and an optical waveguide. A silicon oxide buried oxide layer and a silicon oxide cladding layer are sequentially arranged on the upper surface of the silicon substrate from bottom to top; the optical waveguide is embedded in the silicon oxide cladding and comprises a first waveguide section, a second waveguide section and a third waveguide section which are connected in sequence; wherein the width between the first end and the second end of the first waveguide section along the first direction is constant; the width of the second waveguide section is gradually and linearly increased from the first end to the second end along the first direction, sub-wavelength gratings which are periodically arranged along the first direction are also arranged above the second waveguide section in the silicon oxide cladding, and the width between the first end and the second end of the third waveguide section along the first direction is constant.

A polarization rotator includes a bus waveguide disposed on a first layer having a longitudinal axis, a first end, and a second end, and a first upper waveguide and a second upper waveguide disposed on a second layer, above the first layer, the first upper waveguide and the second upper waveguide widening as the first upper waveguide and the second upper waveguide extend from the first end to the second end. The first upper waveguide and the second upper waveguide may also symmetrically bend toward each other and then away from each other proximate the second end.

A polarization rotator includes a bus waveguide disposed on a first layer having a longitudinal axis, a first end, and a second end, and a first upper waveguide and a second upper waveguide disposed on a second layer, above the first layer, the first upper waveguide and the second upper waveguide widening as the first upper waveguide and the second upper waveguide extend from the first end to the second end. The first upper waveguide and the second upper waveguide may also symmetrically bend toward each other and then away from each other proximate the second end.

The invention provides a near-to-eye display device and a control method, and the device comprises a display assembly which is used for emitting ray polarized light; the zooming assembly is located on a light emitting path of the display assembly and comprises a first liquid crystal polarization rotator and a liquid crystal lens, the first liquid crystal polarization rotator is used for switching and emitting incident linearly polarized light between first linearly polarized light and second linearly polarized light, the phase difference between the first linearly polarized light and the incident linearly polarized light is 0, and the phase difference between the first linearly polarized light and the second linearly polarized light is 0; the phase difference between the second linearly polarized light and the incident linearly polarized light is pi; the liquid crystal lens is located on a light emitting path of the first liquid crystal polarization rotator and used for focusing the first linearly polarized light or the second linearly polarized light emitted by the first liquid crystal polarization rotator on different focal lengths.

According to the light source brightness adjusting device and the light source brightness adjusting method provided by the invention, a mechanical switching device in the background technology is not needed, so that the influence of vibration on the stability of the light source brightness can be avoided. Non-polarized light with brightness to be adjusted is decomposed into first polarized light and second polarized light through the light splitting element, the polarization angle of the first polarized light is adjusted by the first polarization rotator to form third polarized light, and the polarization angle of the second polarized light is adjusted by the second polarization rotator to form fourth polarized light. And the light combining element combines the P light component (or S light component) of the third polarized light and the S light component (or P light component) of the fourth polarized light, so that the brightness of the light output to the objective lens system can be adjusted, and the adjustment of different polarization degrees of the light can be realized to meet the gray scale requirements when different objects are photographed.

Integrated optical circulators that enable polarization diversity are disclosed. A photonic integrated circulator (200) can be fabricated by including multiple polarization beam splitters (220, 222) and optical polarization rotators (230, 232, 234) such that two copies of an optical signal are output at a receiver in substantially aligned polarization states. The circulator (200) can be used to facilitate bidirectional communication between photonic integrated circuit devices that are inherently polarization sensitive while reducing signal loss.

This invention relates to a photonic Nyquist folding receiver system based on polarization multiplexing, comprising: N The first laser and optoelectronic modulator, the second i The laser generates continuous light that enters the first... i Photoelectric modulator, number i The RF input port of the upper arm of the optoelectronic modulator is connected to a carrier signal, the first i The RF input port of the lower arm of the optoelectronic modulator is connected to a binary symbol sequence; N The output optical signals of the photoelectric modulators are coupled and input to two Mach-Zehnder modulators. These two modulators are then connected to the signal under test (SUT) and the SUT processed by a delay circuit, respectively. One output optical signal passes through a polarization rotator and becomes orthogonal to the polarization state of the other optical signal. The two signals are coupled by a polarization beam combiner to output an orthogonally polarized multiplexed optical signal. This signal is then separated by a polarization beam splitter, and the two orthogonally polarized signals are fed into two photodetectors and two low-pass filters for low-pass filtering. Finally, the original frequency of the SUT is obtained by analyzing the frequency and phase difference of the two low-frequency signals. This invention can accurately recover the frequency of the SUT with low structural complexity.

An optical device includes a display device emitting a light and a polarization rotator. The polarization rotator is disposed in front of a light emitting surface of the display device. The polarization rotator includes a wave plate assembly and a back polarizer. The wave plate assembly includes a first quarter-wave plate having an optical axis oriented at a first angle, a first half-wave plate having an optical axis oriented at a second angle, and a second quarter-wave plate having an optical axis oriented at a third angle, in which the first half-wave plate is between the first quarter-wave plate and the second quarter-wave plate, and the second angle is different from the first angle and the third angle. The wave plate assembly is optically coupling between the back polarizer and the display device.

An example polarization splitter and rotator device is described. In one example, an optical device includes: a splitter configured to split an optical signal into a first signal having a first polarization and a second signal having a second polarization; a polarization rotator configured to rotate the second polarization of the second signal to a third polarization; and a polarization mode converter configured to convert the third polarization of the second signal to the first polarization. In some aspects of the embodiments, the splitter can be a curved multimode interference (MMI) polarization splitter, and the polarization rotator includes an input port and an output port, where the output port is wider than the input port. The polarization mode converter can be an asymmetric waveguide tapered mode converter. The devices described herein can overcome the deficiencies of conventional devices and provide low insertion loss, flat and / or wide wavelength response, high manufacturing tolerances, and compact size.

The invention belongs to the technical field of millimeter wave photoelectric devices, and particularly relates to a double-line waveguide polarization rotator model design method. The method comprises the following steps: collecting polarization rotation parameters including a target rotation angle, a working frequency band and an insertion loss requirement; the method comprises the steps that simulation software is used for building a geometric model, simulating metal wires and multiple dielectric layers sequentially surrounding from inside to outside, a double-wire waveguide basic model is built, the two metal wires are parallel and not coplanar and form a waveguide structure, ports are set as optical signal input and output ends, the rotation angle and the optimal length of the metal wires are adjusted, and a three-dimensional simulation model is built; after mode analysis verification, a model entity is obtained through 3D printing, the polarization state and the polarization extinction ratio are tested, and the performance is evaluated; and finally, iterative optimization is carried out until the optimal rotation angle is obtained. The method supports flexible regulation and control of the polarization rotation angle, the influence of external factors on the performance is small, efficient and accurate control over the light polarization state can be achieved, and the method is suitable for the fields of terahertz communication, imaging and the like.

The utility model relates to a two-way polarization-maintaining amplification laser light source, which comprises a seed source, a first isolator, a polarization splitting prism, an optical path separation device, an optical filter, a double-optical-fiber collimator, a pumping source, a non-polarization-maintaining single-mode gain optical fiber, a single-optical-fiber collimator, a polarization rotator, a reflection device and a second isolator. The polarization-maintaining optical fiber amplifier can solve the problems of high cost and secondary pulse of a polarization-maintaining optical fiber amplifier in the prior art.

Reflective polarization rotators based on twisted nematic (TN) liquid crystal (LC) configurations may optimize achromatic performance in bright and dark states through wavelength dependencies of polarization conversion compensated by TN LC layers. Under linear achromatic input polarization, the purpose of compensation is to provide circular achromatic polarization at the reflector, which ensures achromatism of 90 degree polarization rotation at two passes. The compensation notes to maintain linear polarization at the reflector when the LC device is driven to a vertical LC director configuration. The method ensures that the performance of the polarization rotator is achromatic in the driving state and the non-driving state of the LC device.

The present invention discloses a high extinction ratio optical rotator, which sequentially includes a collimator, a polarization beam splitting prism pair, a non-reciprocal 45-degree polarization rotator, and a mirror along the optical path direction; the polarization beam splitting prism pair is composed of a first birefringent crystal wedge plate and a second birefringent crystal wedge plate with mutually perpendicular optical axis directions. The optical axis of the first birefringent crystal wedge plate is parallel to the vertical plane, and the optical axis of the second birefringent crystal wedge plate is perpendicular to the vertical plane; the polarization beam splitting prism pair separates two orthogonal polarization components of the input signal light. After passing through the polarization beam splitting prism pair, the signal light is divided into vertically polarized light and horizontally polarized light with orthogonal polarization states, and the intersection point of the vertically polarized light and the horizontally polarized light is located on the surface of the mirror. By setting the polarization beam splitting prism pair, the present invention eliminates the deviation of the polarization rotation angle of the polarization rotator caused by factors such as temperature, wavelength, and processing tolerance, ensuring that the signal light passing through the optical rotator can obtain a high extinction ratio.

The present invention provides a superconducting nanowire single-photon detector based on TM0 mode absorption and a detection method, comprising: a directional coupler for realizing the conversion from TE0 mode to TE1 mode; a polarization rotator connected to the directional coupler for realizing the conversion from TE1 mode to TM0 mode; and a nanowire single-photon detector connected to the polarization rotator for realizing the absorption and detection of the TM0 mode. The superconducting nanowire single-photon detector based on TM0 mode absorption of the present invention has a simple structure, realizes the efficient conversion from TE0 mode to TM0 mode on the basis of SOI structure, and is quickly absorbed and detected by the nanowire single-photon detector, which not only greatly shortens the required length of the nanowire, thereby reducing the process conditions required for the production of the nanowire, but also protects the device from being damaged by the etchant, so that the working performance of the device is stable.

An optical circuit is used with continuous wave signals having different wavelengths at a channel spacing from one another. A portion of the optical circuit is implemented in a photonic integrated circuit. Modulators in a modulation stage modulate the continuous wave signals to produce modulated signals. A multiplexing stage, which can have multiplexing filters, power combiners, or power couplers, multiplexes the continuous wave or modulated signals to produce multiplexed signals. The multiplexing stage may be placed either before or after the modulation stage. One or more polarization rotator and combiner (PRC) devices in a final stage combines the multiplexed signals into an output signal. The output signal has a first set of the different wavelengths at a first polarization and has a second separate set of the different wavelengths at a second polarization orthogonal to the first polarization.

A laser radar full-polarization high-power laser source comprises a full-polarization synthesis system, the full-polarization synthesis system comprises a first laser and a second laser, a first lens and a second lens are arranged in the light emitting direction of the first laser and the light emitting direction of the second laser respectively, a polarization rotator is arranged in the light emitting direction of the first lens, and a second lens is arranged in the light emitting direction of the second lens. A first reflector plate is arranged in the light-emitting direction of the polarization rotator, the full-skew high-power laser source further comprises a polarization wave-combining prism, and the light-emitting directions of the first reflector plate and the second lens are respectively aligned with the vertical input end and the horizontal input end of the polarization wave-combining prism. The invention further discloses an installation and debugging method of the laser radar full-skewed high-power laser source. Compared with the existing design that two groups of radar amplification light paths need to be arranged independently, the design of one amplification light path is reduced, only one light amplifier needs to be used, the integration level is improved, and the cost is reduced.

The present invention discloses a method and system for generating a dual-band phase-coded signal based on DP-BPSK. The system includes an LD light source, a DP-BPSK modulator, a code signal generator, a first radio frequency signal generator, a second radio frequency signal generator, and a photodetector; the DP-BPSK modulator includes a first DD-MZM, a second DD-MZM, a 90° polarization rotator, and a polarization beam combiner; the LD light source is connected to the first DD-MZM and the second DD-MZM through an optical fiber; the first DD-MZM is connected to the polarization beam combiner, the second DD-MZM is connected to the polarization beam combiner through a 90° polarization rotator, and the polarization beam combiner is connected to the photodetector; the two signals generated by the code signal generator are respectively connected to a radio frequency port of the first DD-MZM and a radio frequency port of the second DD-MZM; the first radio frequency signal generator is connected to another radio frequency port of the first DD-MZM, and the second radio frequency signal generator is connected to another radio frequency port of the second DD-MZM. The present invention utilizes a DP-BPSK modulator to generate a dual-band phase-coded signal by performing phase encoding on radio frequency signals with different frequencies in the optical domain.