38 results about "Polarization rotator" patented technology

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.

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 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 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.

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.

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 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.

Device comprising: a photonic integrated circuit (PIC) containing multiple optical waveguides; a polarization rotator structure (301, 401) integrated in the PIC and optically coupled at a first end to at least one of the optical waveguides, wherein the polarization rotator structure (301, 401) includes: a first core structure (C2) formed in a first layer, wherein the first core structure (C2) extends from the first end to a second end of the polarization rotator structure (301, 401), and a second core structure (C1, C3) formed in a second layer located at a different depth than the first layer and close to the first core structure, wherein the first core structure (C2) and the second core structure (C1, C3) provide mode hybridization between at least two orthogonally polarized waveguide modes of the polarization rotator structure (301, 401), and wherein the first layer and the second layer are separated by a third layer comprising a material that differs from a core material of the first core structure and from a core material of the second core structure, and / or the core material of the first core structure differs from the material of the second core structure; and an optical divider structure (302, 402) integrated in the PIC and optically coupled at a first end to the second end of the polarization rotator structure (301, 401) and optically coupled at a second end to at least two of the optical waveguides, wherein the optical divider structure (302, 402) comprises: a first core structure (C2) associated with at least one of the first or second core structures of the polarization rotator structure (301, 401), and a second core structure (C1, C3) that is separated from both the first and second core structures of the polarization rotator structure (301, 401).

The application discloses a flexible transparent broadband polarization rotator based on a metamaterial, which is composed of a patterned flexible transparent metal mesh, a flexible transparent PDMS medium substrate and a flexible transparent metal mesh as a reflecting backplane from top to bottom. The polarization rotator can convert horizontal polarization electromagnetic waves in a 9.15-18.25 GHz frequency band into vertical polarization electromagnetic waves, and convert the vertical polarization electromagnetic waves into horizontal polarization electromagnetic waves, and the conversion efficiency is as high as 90%. The FSS structure is novel, the U-shaped structure is adopted as the metamaterial structure, and in addition to the bandwidth of polarization rotation, the biggest advantage of the polarization rotator is that the structure is simple and only the most common three-layer structure can be used to realize the polarization rotation, and the novel conductive material and dielectric material are used, and excellent optical transparency and mechanical flexibility are provided.

A light generating system (1; 100) comprising: a first solid-state light source (3) configured to emit first light source light (4); a luminescent element (5) being arranged downstream of the first solid-state light source and being configured to, at least partly, convert the first light source light (4) into green-yellow converted light (6) comprising short wavelength green-yellow converted light (61) having a first centroid emission wavelength, λc1, and long wavelength green-yellow converted light (62) having a second centroid emission wavelength, λc2, where λc2 > λc1; a first dichroic mirror (7) being arranged downstream of the first solid-state light source (3), being transparent for the first light source light (4) and reflective for the long wavelength green-yellow converted light (62), and arranged to direct the first light source light in a direction towards the luminescent element (5); a second dichroic mirror (8) being arranged downstream of the luminescent element (5), and being arranged to direct the short wavelength green-yellow converted light (61) in a direction towards the luminescent element (5); the luminescent element (5) being configured to receive the short wavelength green-yellow converted light (61) and convert the short wavelength green-yellow converted light (61) into long wavelength green-yellow converted light (62); a second solid-state light source (9) configured to emit second light source light (10); a third solid-state light source (11) configured to emit short wavelength green light source light (12); a first polarizing beam splitter (15) being arranged downstream of the second solid-state light source (9) and of the third solid-state light source (11), and being transparent for the second light source light (10) and the short wavelength green light source light (12); a first diffusing element (16) configured to diffuse the second light source light (10) to provide diffuse blue light (17) and to diffuse the short wavelength 20 green light source light (12) to provide diffuse short wavelength green light (18); and a first polarization rotator element (19) being configured to rotate the polarization of the diffuse blue light (17) to provide polarization rotated diffuse blue light (20) and to rotate the polarization of the diffuse short wavelength green light (18) to provide polarization rotated diffuse short wavelength green light (21), the first polarizing beam splitter (15) further being reflective for the polarization rotated diffuse 25 blue light (20) and the polarization rotated diffuse short wavelength green light (21), wherein, in an operational mode of the light generating system the system light (2), comprises the long wavelength green-yellow converted light, the polarization rotated diffuse blue light (20), and the polarization rotated diffuse short wavelength green light (21).

The present invention relates to a lidar device (1) for detecting the environment of a vehicle, wherein the lidar device comprises the following: a laser light source (10) designed to emit laser light, an optical head (18) with an optical transmitting and receiving unit for emitting laser light into the environment and for receiving laser light reflected from the environment, and at least one detector (40, 58) designed to convert received laser light (22) into electrical signals. According to the invention, the lidar device (1) further comprises the following: a first splitter (14) for splitting the emitted laser light into a portion to be emitted (20) and a portion to be stored, an optical storage element (28), for storing the portion to be stored, a second optical splitter (32) which is designed to direct the portion to be stored, after storage, proportionally via a first optical (34) connection directly and via a second optical connection (64) via a polarization rotator (62) in the direction of the at least one detector (40, 58).

This invention discloses a quantum key distribution device, method, and key rate estimation method based on a labeled source combined with light source monitoring. In the transmitting end of the device, a first optical switch and a second optical switch simultaneously and randomly select a period of time to send a second signal light to the light source monitoring module and a first idle light to the same module, respectively. The idle light passes through a polarization rotator to obtain a second idle light with the same polarization state as the second signal light. The second signal light and the second idle light pass through a beam splitter and then enter a single-photon detector to measure the coincidence count and calculate the HOM interference visibility, thus achieving light source monitoring. This invention improves the security and confidentiality of quantum key transmission by using a labeled single-photon source combined with a three-intensity decoy state scheme and a light source monitoring scheme. By measuring the HOM interference visibility, the amount of information that may be leaked at the source end can be characterized, thereby more accurately estimating the key rate that can be extracted at the measurement end.

The purpose of the present invention is to provide an electronic apparatus which is small in size and light in weight and has a high light utilization efficiency.　An electric apparatus according to the present invention has a display device, reflective polarization plates (41, 44), and an optical rotator (43), and can constitute a catadioptric system (30) having a high light utilization efficiency without using a half mirror. A display panel (31) capable of time division emission of R (red light), G (green light), and B (blue light) light is used as the display device, and a Faraday rotator having the function of changing the magnetic flux density of a generated magnetic field is used as the optical rotator (43). Accordingly, the rotation angle with respect to the polarized light of each of R, G, and B can be controlled, and the rotation angle of the light of each wavelength can be aligned.

A spin-orbit torque (SOT) measuring apparatus includes a photoelastic modulator (PEM) configured to periodically modulate a polarization direction of linearly polarized incident light and emit a periodically modulated light, a first polarization rotator configured to rotate a polarization direction of the periodically modulated light, a voltage generator configured to generate an AC current to a sample to which light with the rotated polarization direction is to be emitted, a prism configured to split light reflected into first light and second light having different polarization directions, a balanced detector configured to output a signal corresponding to an intensity difference between the first light and the second light, a changing circuit configured to change a frequency component to the intensity difference, and an amplitude measurer configured to measure an amplitude of a frequency component corresponding to a modulation frequency of the PEM with the changed frequency component.

The application relates to the field of quantum information, and discloses a chipped quantum random number generation device and method. The device adopts a full-chip integrated architecture, and sequentially integrates a laser chip, a plasma polarization rotator, a plasma beam splitter and a photodetector, and realizes true random number generation through a single-photon branch path scheme. The laser chip outputs single-photon-level laser, which is incident to the beam splitter after being regulated by the rotator into a polarization state suitable for beam splitting requirements; single photons randomly select transmission paths in the beam splitter based on quantum scattering effects, are emitted from two output ends respectively and are detected correspondingly; through random triggering events of two-way detection signals, binary random sequences are converted, and chipped quantum random number output is realized. The device is miniaturized and has high integration, discards traditional discrete optical elements, has the characteristics of low cost, high stability and easy batch production, and can be widely applied to on-chip quantum computing, quantum communication and miniature encryption equipment and the like.

The invention relates to a reconfigurable pulse compression signal generation system and method. The system comprises a light source, a radio frequency source, a signal source, a dual-polarization quadrature phase shift keying modulator, an optical coupler, a bias voltage controller, a polarization controller, a polarization beam splitter and a photoelectric detector. The dual-polarization quadrature phase shift keying modulator comprises a Y-shaped optical splitter, a first modulator, a second modulator, a polarization rotator and a polarization beam combiner. A local oscillation signal output by a radio frequency source and a coding signal output by a signal source are loaded to different radio frequency ports of a dual-polarization quadrature phase shift keying modulator respectively, and bias voltage is loaded to a voltage port of the dual-polarization quadrature phase shift keying modulator through a bias voltage controller. The bias voltage of the dual-polarization quadrature phase shift keying modulator is stabilized, passes through the polarization controller and the polarization beam splitter and then enters the photoelectric detector for beat frequency, and pulse compression signals in different formats are obtained by adjusting the formats of coded signals output by the signal source.

The invention relates to a polarizing beam splitter-rotator. A photonic integrated circuit (PIC) may include a polarization rotator. The polarization rotator may include a first waveguide layer including a first set of waveguides. At least one waveguide in the first set of waveguides may be a segmented waveguide. The polarization rotator may include a second waveguide layer including a second set of waveguides. The refractive index of the core material of the second set of waveguides may be less than the refractive index of the core material of the first set of waveguides.

A light generating system (100) configured to, in operation, emit system light (2), and comprising a solid state light source (3) configured to, in operation, emit light source light (4), a beam splitting element (7) being reflective for at least a first part (41) of the light source light, a polarization maintaining diffusing element (8) being arranged downstream of the beam splitting element (7) and being configured to receive and diffuse at least the first part (41) of the light source light into diffuse light (9), a first polarization rotator element (10) being configured to rotate the polarization of the diffuse light (9) to provide polarization rotated diffuse light (11), and a luminescent element (5). The beam splitting element (7) is transmissive for the polarization rotated diffuse light (11). An optical arrangement (15) is arranged downstream of the beam splitting element (7), and is configured to receive, reflect and rotate the polarization of at least a part of the polarization rotated diffuse light (11) to form reflected polarization rotated diffuse light (16). The luminescent element (5) is configured to receive and convert at least part of the reflected polarization rotated diffuse light (16) into first converted light (17). The beam splitting element (7) is further reflective for the reflected polarization rotated diffuse light (16) and reflective for the first converted light (17). The optical arrangement (15) is configured to transmit at least part of the first converted light (17). The system light (2) comprises at least the first converted light (17).

The invention discloses a resolution-adjustable super-resolution optical fiber digitization maskless photoetching device and method, and relates to the technical field of digitization maskless photoetching. Wherein the STED super-resolution light source and the optical fiber beam splitting assembly output M * N dual-wavelength light beams with equal-proportion light intensity; the digital pattern programmer controls the on-off and output light beam intensity of the M * N digital optical switches, and programs and pixelates the M * N STED super-resolution optical fibers to generate and switch a photoetching pattern; the pure polarization rotator converts radial or angular polarization vortex suppression light beams in the STED super-resolution double-beam array into generalized column vector vortex suppression light beams with different azimuth angles, and the generalized column vector vortex suppression light beams are focused by the objective lens to obtain annular light fields with different dark spot sizes. And when the size of the dark spot changes along with the azimuth angle, the effective area inhibited by the center of the annular light field changes, so that the photoetching resolution is adjustable. According to the invention, digital maskless super-resolution photoetching with high flexibility and adjustable resolution is realized.

According to an example aspect of the present disclosure, there is provided a twisted waveguide arranged to rotate the polarization of light passed through the twisted waveguide, wherein the twisted waveguide is made of polymer and arranged to be connected between waveguides on a Photonic Integrated Circuit, PIC, the twisted waveguide being arranged to rotate the polarization of light by about 45 degrees.

The application relates to the field of optical communication and discloses a photonic integrated multi-wavelength coherent transmitter and a transmitting method, which comprises a multi-wavelength light source, a transmitter modulation module and an optical amplifier; the transmitter modulation module comprises a total beam splitter, a first micro-ring modulation sub-module, a second micro-ring modulation sub-module, a polarization rotator and a polarization light combiner; the total beam splitter divides the light wave generated by the multi-wavelength light source into a first light wave and a second light wave, and respectively sends the first light wave and the second light wave to the first micro-ring modulation sub-module and the second micro-ring modulation sub-module for modulation to obtain a first optical signal and a second optical signal; the polarization rotator performs polarization rotation on the second optical signal; and the polarization light combiner couples the first optical signal and the polarization-rotated second optical signal to obtain a composite optical signal which is amplified by the optical amplifier and then transmitted. Compared with the existing Mach-Zehnder modulator-based coherent transmitter, the application can improve the integration level by reducing the number of modulators.

Structure (10) for a polarization rotator, wherein the structure (10) comprises: a substrate (16); a first waveguide core (12) over the substrate (16), wherein the first waveguide core (12) comprises a section (18, 20); a second waveguide core (40) above the substrate (16), wherein the second waveguide core (40) is positioned near the section (18, 20) of the first waveguide core (12), and the second waveguide core (40) is vertically displaced from the first waveguide core (12), and a third waveguide core (60) which is vertically displaced from the first waveguide core (12), wherein the third waveguide core (60) comprises a section (70) which is positioned in an overlapping relationship with the section (18, 20) of the first waveguide core (12), wherein the second waveguide core (40) consists of a first material having a refractive index that is reversibly variable in response to a stimulus, wherein the first waveguide core (12) consists of a second material different from the first material, and the third waveguide core (60) consists of a third material different from both the first and second material, and the section (70) of the third waveguide core (60) and the section (18, 20) of the first waveguide core (12) define a polarization region configured to rotate a polarization mode of light, and the second waveguide core (40) is configured to absorb the light when the stimulus is applied to the first material.

The invention provides a polarization-regulated single-photon detector. The polarization-regulated single-photon detector comprises a substrate, and an input waveguide, a polarization rotator, an asymmetric directional coupler, a bent directional coupler and a coupling output region which are arranged on the substrate. An input TM0 mode is converted into a high-order mode through the polarization rotator, then the high-order mode is coupled to another waveguide through the asymmetric directional coupler and converted into a TE0 mode, meanwhile, the input TE0 mode is kept to be transmitted in an original path, finally, two paths of TE0 mode signals are detected through the two superconducting nanowire single-photon detectors respectively, and polarization-independent single-photon detection is achieved. According to the detector, the polarization regulation and control function is integrated on a chip, loss and instability caused by an external polarization control element are avoided, and the integration level, the detection efficiency and the working stability of the detector are remarkably improved. The invention further provides a preparation method of the polarization-regulated single-photon detector, a detection device and application of the polarization-regulated single-photon detector.

The application discloses a polarization assimilator and a multi-wavelength polarization light beam combining method and system, wherein the polarization assimilator comprises a first polarization rotator, a polarization beam splitter, a phase modulator, a polarization beam combiner, a second polarization rotator and a polariscope arranged in sequence along an optical path. Through the polarization assimilator core design based on the polarization interference filtering principle, the application realizes efficient conversion and beam combining of multi-wavelength polarization light, can achieve nearly zero-loss beam combining output, significantly reduces the insertion loss of the optical module, and helps to reduce the overall power consumption of the system. In addition, the polarization assimilator can adopt a modularized layer-by-layer architecture, and can theoretically realize beam combining of an unlimited number of wavelengths, thereby providing a highly expandable and compact optical engine solution for future higher-rate optical communication modules.