41 results about "Optical phase modulator" patented technology

The invention discloses a lithium niobate electro-optical polarization modulator based on an adiabatic coupling structure and a modulation method thereof. The modulator comprises a first adiabatic coupling polarization beam splitting rotator, an electro-optical phase modulator and a second adiabatic coupling polarization beam splitting rotator, wherein each adiabatic coupling polarization beam splitting rotator comprises an input waveguide, an adiabatic coupler and a separation waveguide. According to the modulation method, transmission is carried out through a straight-through end in a first adiabatic coupling type polarization beam splitting rotator, and TE0 is kept unchanged; when the input light is TM0, the input light is converted into TE0 through the first adiabatic coupling type polarization beam splitting rotator and is transmitted through the cross end. And after phase modulation is carried out by the electro-optic phase modulator and beam combination is carried out by the second adiabatic coupling type polarization beam splitting rotator, output light is remapped into TE0 and TM0, and the polarization state is determined by the relative phase difference, so that dynamic regulation and control of the polarization state are realized.

A photonic integrated circuit (PIC) is disclosed herein. The PIC can include a substrate, a main optical waveguide supported by the substrate. The main optical waveguide can be in communication with an electromagnetic radiation source, and configured to receive electromagnetic radiation from the electromagnetic radiation source. A first branch optical waveguide can be optically coupled to the main optical waveguide at a first location. An optical phased array (OPA) can include plurality of array elements, each having an optical antenna and an optical phase modulator. At least some array elements within a first subset of the plurality of array elements can be optically coupled to the first branch optical waveguide wherein locations of at least some of the plurality of array elements are aperiodic in one or more directions on the substrate.

A spectral linewidth adjusting method includes: adjusting a timing of a first trigger signal for amplifying and converting a portion of a first pulse laser beam to a second pulse laser beam and / or a timing of a second trigger signal for amplifying and converting a portion of second continuous light to a third pulse laser beam and adjusting a spectrum of a fourth pulse laser beam obtained by performing sum-frequency mixing of the second and third pulse laser beams to a first spectrum in a non-Gaussian shape; and modulating a wavelength of the second continuous light within time corresponding to one pulse of the third pulse laser beam and adjusting the spectrum of the fourth pulse laser beam to a second spectrum having a spectral linewidth wider than the first spectrum through generation of a modulation signal for supplying the modulation signal to an optical phase modulator.

An optical phase modulator includes a first layer made of dielectric material with a waveguide and a heater extending therein; at least one upper trench arranged above the heater and side trenches arranged on either side of the waveguide and the heater, and a second layer made of dielectric material extending over the first layer made of dielectric material and covering each first, second and third trench.

The application discloses a Stokes parameter encoder, which comprises a fiber optical circulator and an optical path round trip path; a polarization maintaining fiber Faraday rotator is arranged on the optical path round trip path to rotate the polarization of light by 45 degrees; the fiber optical circulator is a polarization maintaining fiber optical circulator; the fiber optical polarization beam splitter is a polarization maintaining fiber optical polarization beam splitter; the delay fiber is a polarization maintaining delay fiber; and the fiber optical phase modulator is a polarization maintaining fiber optical phase modulator. The application further discloses a parameter encoding method of the encoder. The above technical scheme can perfectly offset the rotation angle deviation problem caused by the device, can guarantee the stability of the rotation angle regardless of the angle deviation of the device, is easy to realize the driving circuit, is easy to integrate and small in size due to the pure fiber structure, and can realize the continuous variable quantum key distribution of the complete GG02 protocol based on the Stokes encoder.

This application relates to a Rayleigh scattering noise suppression method and system for a distributed acoustic wave detection system. The method includes: performing optical phase sinusoidal modulation on a high-coherence continuous laser output from a narrow-linewidth laser in an FBG-based distributed acoustic detection system according to a set modulation scheme using an optical phase modulator; the set modulation scheme is Csin(2πf m t), C is the phase modulation amplitude, f m The phase modulation frequency and satisfying f m τ = k, where τ is the time difference between two adjacent reflected light pulses being detected, t is time, and k is an integer. A highly coherent continuous laser beam with sinusoidal phase modulation is passed through an unbalanced interferometer to generate dual light pulses. These dual light pulses are then injected into an FBG array for distributed acoustic wave detection. This achieves low-noise distributed acoustic wave detection and effectively improves the detection performance of FBG-based distributed acoustic wave detection.

A light source for a frequency-modulated continuous-wave (FMCW) LiDAR device is formed by a photonic integrated circuit and comprises a substrate and a multilayer structure. Formed in the multilayer structure is a semiconductor laser that is received in a recess etched into the multilayer structure. An optical path between the semiconductor laser and a reflector forms an external cavity for the semiconductor laser. The external cavity includes a variable attenuator causing an attenuation of light guided in the cavity optical waveguide. The external cavity may also or alternatively include an optical phase modulator.

A system includes at least one laser configured to produce laser light and an optical element configured to produce shaped light responsive to receiving the laser light. The system also includes an optical phase modulator (OPM) optically coupled to the optical element, the OPM configured to modulate the shaped light to produce modulated light, where the optical element is configured to reduce a point spread function of the modulated light in a far field.

The present disclosure provides an optical waveguide modulation device and an optical phase modulator. The optical waveguide modulation device comprises a substrate, an isolation layer arranged on the substrate, a ridge waveguide structure arranged on a side of the isolation layer away from the substrate, comprising a first slab layer arranged on a side of the isolation layer away from the substrate, and a ridge protrusion layer arranged on a side of the first slab layer away from the isolation layer, and a first metal layer arranged on a side of the isolation layer away from the substrate and located on both sides of the ridge waveguide structure, wherein the first metal layer extends to the side of the first slab layer away from the isolation layer towards the ridge waveguide structure to cover the two side edges of the first slab layer. The technical scheme of the embodiment of the present disclosure can reduce the electromagnetic field leakage on both sides of the first slab layer of the ridge waveguide structure, so that the electric field entering the ridge structure is more concentrated, thereby improving the modulation efficiency of the optical waveguide modulation device.

This invention discloses an ultra-low residual amplitude modulation waveguide-optical phase modulator, comprising a first electrode layer and a second electrode layer parallel to each other. An α-phase waveguide channel and a substrate layer are disposed between the first and second electrode layers. The optical axes of the α-phase waveguide channel and the substrate layer are both perpendicular to the plane of the first electrode layer. The difference between the thermo-optical coefficient of the α-phase waveguide channel and the thermo-optical coefficient of the substrate layer is less than a preset thermo-optical coefficient difference threshold. Part of the side of the α-phase waveguide channel is covered by the substrate layer. The electric field between the first and second electrode layers uniformly covers the entire α-phase waveguide channel and the substrate layer. The two ends of the α-phase waveguide channel serve as the input and output ends of the light beam, respectively. This invention, by changing the electric field application method and thermo-optical coefficient matching, fundamentally maintains the consistency of the interference phase, thereby significantly reducing the sensitivity of RAM signals to voltage and ambient temperature fluctuations.

The present disclosure relates to the field of electro-optical devices. Specifically, the present disclosure provides a monolithically integrated electro-optical phase modulator fabricated using a III-V semiconductor process on silicon. The phase modulator includes a silicon-based n-type substrate base layer and a III-V n-type ridge waveguide for propagating light, wherein the ridge waveguide protrudes from and extends along the n-type substrate base layer. In addition, the phase modulator includes one or more insulating layers provided on the ridge waveguide, and a silicon-based p-type cap layer provided on the one or more insulating layers, at least above the ridge waveguide, wherein the one or more insulating layers have a total thickness of 1-100 nm.

A wavelength-mode hybrid multiplexer based on a cascaded multimode interferometer structure belongs to the field of silica integrated optics technology. From bottom to top, it consists of a silicon substrate, a silica lower cladding, a germanium-doped silica core layer, and a silica upper cladding. The germanium-doped silica core layer and the upper cladding are located together on the lower cladding, and the core layer is coated in the upper cladding. The germanium-doped silica core layer is composed of a 1×2 Y-branch waveguide, an optical phase modulator, a 2×2 multimode interferometer, a first 1×2 multimode interferometer, a second 1×2 multimode interferometer, a first 1×1 multimode interferometer, and a second 1×1 multimode interferometer. This wavelength-mode hybrid multiplexer adopts a passive structure. Through the optical phase modulator on the modulation arm waveguide and the self-imaging principle of the multimode interferometer structure, it can multiplex and demultiplex the four input signals: TE0 and TE1 at a wavelength of 1550nm and TE0 and TE1 at a wavelength of 1620nm.

Quantum key distribution, QKD, transmitter apparatus including a beam splitter configured to receive an initial pulse train of optical pulse pairs, a first photodetector, an optical storage line, a phase modulator, a polarisation rotation mirror, a second photodetector and processing circuitry configured to:determine first arrival times, tlin, of optical pulses detected at the first photodetector;determine second arrival times, tlout, of optical pulses detected at the second photodetector;determine a time delay, t, based on a time difference, Dt, between a second arrival time and a respective first arrival time; andgenerate an electric modulation signal configured to cause the optical phase modulator to phase modulate one of the optical pulses of optical pulse pairs of the second pulse train for modulation periods based on respective first arrival times plus the time delay.

The invention relates to a spatial domain measurement distributed optical fiber acoustic wave sensing system and a measurement method thereof, the system comprises a light source, and an optical phase modulator, an optical amplifier, an optical circulator and an optical fiber for distributed sensing which are sequentially arranged on a light path of incident light of the light source, and the optical circulator is also located on a light path of light returned from the full length range of the optical fiber. The optical circulator is sequentially connected with a photoelectric detector, a data acquisition card and a computer on the light path of the return light; the optical phase modulator comprises a first radio frequency source, a second radio frequency source, a first electronic switch, a second electronic switch, a frequency mixer and an acousto-optic modulator. According to the invention, a double heterodyne pulse modulation injection technology is combined with a spatial domain phase demodulation method, so that continuous distributed synchronous measurement of a vibration field / sound wave field in a full length range of the optical fiber is realized, and the sensing precision and the spatial resolution are remarkably improved; the core requirements of geophysical exploration, energy industry monitoring, large-scale structure health monitoring and other scenes on spatial domain signal analysis can be met.

The invention provides a spectrum testing method for electro-optical modulation signals. The device is composed of a laser, a microwave signal source, a to-be-measured electro-optical modulation signal generation module, an optical frequency shifter, an electro-optical phase modulator, a photoelectric detector and a spectrum analysis module, optical signals output by the laser are divided into two paths, the upper path is in optical connection with the to-be-measured electro-optical modulation signal generation module, and the lower path is in optical connection with the to-be-measured electro-optical modulation signal generation module. The lower path is sequentially and optically connected with the optical frequency shifter and the electro-optic phase modulator and is optically connected with the photoelectric detector after being combined, the microwave signal source is electrically connected with the radio frequency end of the electro-optic phase modulator, and the output end of the photoelectric detector is electrically connected with the spectrum analysis module. Heterodyne mixing signals f1-pf2 (p is a positive integer) of an electro-optical modulation spectrum signal f1 to be detected and an electro-optical phase modulation signal f2 are detected, mixing signal power ratios when output signal voltages of a microwave signal source are V2 and kV2 respectively are analyzed, the p value and the frequency f1 are determined by utilizing the Bessel function relation, meanwhile, the frequency response of a photoelectric detector is calibrated, and the frequency response of the photoelectric detector is calibrated. The relative amplitude of each order of light modulation sideband of the electro-optical modulation spectrum to be tested is obtained, and spectrum testing of the electro-optical modulation signal to be tested is achieved.

This invention provides a method for narrowing the spectral linewidth of a laser beam to a level where chromatic aberration is negligible. [Solution] The adjustment method includes: a first step of adjusting at least one of the timing of a first trigger signal that amplifies a portion of the first pulsed laser light and converts it into a second pulsed laser light, and the timing of a second trigger signal that amplifies a portion of the second continuous light and converts it into a third pulsed laser light, thereby adjusting the spectrum of the fourth pulsed laser light, which is obtained by sum-frequency mixing of the second pulsed laser light and the third pulsed laser light, to a first spectrum with a non-Gaussian shape; and a second step of causing a modulation signal generator to generate a modulation signal of the same pattern synchronized with the emission trigger signal, and providing the modulation signal of the same pattern to an optical phase modulator, thereby modulating the wavelength of the second continuous light within a time corresponding to one pulse of the third pulsed laser light, thereby adjusting the spectrum of the fourth pulsed laser light to a wider spectral linewidth.

This disclosure provides a thermo-optical phase modulation device and an optical phase modulator. The thermo-optical phase modulation device includes: a substrate; an isolation layer disposed on the substrate; an integrated waveguide structure disposed on the side of the isolation layer away from the substrate, including a first waveguide and a second waveguide, the first waveguide being disposed on the side of the isolation layer away from the substrate, the second waveguide being disposed on the side of the first waveguide away from the substrate, and the projection of the second waveguide along a first direction Z being located above the first waveguide; and a cover layer disposed on the side of the first waveguide away from the isolation layer and covering the integrated waveguide structure. The first waveguide has a first refractive index, the second waveguide has a second refractive index, and the first refractive index is different from the second refractive index. The technical solution of the embodiments of this disclosure can achieve optimized configuration of the function of the thermo-optical phase modulation device, especially improving the thermal modulation efficiency of the thermo-optical phase modulation device.

A semiconductor optical phase modulator includes an optical phase modulation element, a first semiconductor optical amplifier to amplify light input to the optical phase modulation element, and a second semiconductor optical amplifier to amplify modulated signal light output from the optical phase modulation element. A light input end of the semiconductor optical phase modulator is a light input end face of the first semiconductor optical amplifier. A light output end of the semiconductor optical phase modulator is a light output end face of the second semiconductor optical amplifier.

This invention provides a method based on MXene Ti 3 C 2 T x All-optical phase modulation device and modulation method for PDMS. This all-optical phase modulation device consists of a fiber interferometer and MXene Ti... 3 C 2 T x Two-dimensional materials, PDMS material composition, MXene Ti 3 C 2 T x Two-dimensional material was deposited onto the surface of coreless fiber II of the fiber interferometer. The surfaces of coreless fibers I and II of the fiber interferometer were also coated with PDMS material to complete the fabrication of an all-optical phase modulator. Based on MXene Ti... 3 C 2 T x The high photothermal conversion efficiency of two-dimensional materials and the high thermo-optical coefficient of PDMS material convert changes in excitation light into changes in the refractive index of PDMS material. The fiber optic interferometer senses the refractive index change of PDMS material, causing wavelength shift and phase change in the output interference spectrum. This invention optimizes the sensitivity of phase modulation, reduces device size, and enhances device reliability and practicality.

The invention relates to the technical field of fiber-optic gyroscopes, in particular to a phase nonlinear error compensation method and system for a gyroscope system and a storage medium, and the method comprises the following steps: constructing a modulator-based hysteresis compensation model in the gyroscope system; constructing a closed-loop control model of the gyro system, and combining the closed-loop control model with the hysteresis compensation model to obtain a voltage control signal and a rotating speed signal for controlling the gyro system; wherein the closed-loop control model calculates a gain coefficient and a phase error, the gain coefficient and the phase error complete closed-loop adjustment optimization of ADC signal replication, and a compensation value of a depth signal after depth truth value calculation is fed back to the hysteresis compensation model. A compensation inverse model obtained after calculation of the hysteresis compensation model becomes a driving signal applied to a modulator for nonlinear suppression and serves as a voltage control signal of a gyro system. The problem that the hysteresis characteristic of the stress optical phase modulator affects the performance of a gyroscope system is solved.

The invention provides an electro-optic phase modulator and system. Specifically, the electro-optic phase modulator comprises incident resonant cavities and an electro-optic crystal, and the incident resonant cavities are symmetrically arranged based on a vertical plane of a light path of the electro-optic crystal; a feed-in connector is arranged on a first wall plate, far away from the emergent resonant cavity, of the incident resonant cavity, is located on the vertical plane and is used for transmitting a radio frequency signal; in addition, at least part of the frequency modulation assembly is located in the incident resonant cavity and is arranged on the vertical plane or symmetrically arranged relative to the vertical plane. According to the technical scheme, light waves can be symmetrically modulated at the same intensity no matter the light waves enter from the front face or the back face of the electro-optical crystal, the problem that application of asymmetric design in the light path transmitting and receiving links is limited is solved, the application range of the modulator is widened, and the application range of the modulator is widened. The method is especially suitable for modulation processing of bidirectional optical signals in an optical communication system and an optical sensing system.

An optical phase modulator includes a rib part extending in an extending direction. The rib part includes an N-type first rib portion and a P-type second rib portion arranged in a width direction to have a PN junction therebetween along the extending direction. An N-type first slab portion is connected to the first rib portion and a P-type second slab portion is connected to the second rib portion to provide a PN structure with the rib part in a cross-section having a normal direction along the extending direction. A P-type third slab portion is connected to the first rib portion and an N-type fourth slab portion is connected to the second rib portion to have a PNPN structure with the rib part in a cross-section having a normal direction along the extending direction. The PN structure and the PNPN structure are alternately disposed in the extending direction.

An optical waveguide modulation device (10) and an optical phase modulator comprising the optical waveguide modulation device (10). The optical waveguide modulation device (10) comprises: a substrate (20); an isolation layer (30) arranged on the substrate (20); a ridge waveguide structure (40) arranged on the side of the isolation layer (30) facing away from the substrate (20); and a first metal layer (50) arranged on the side of the isolation layer (30) facing away from the substrate (20) and located on two sides of the ridge waveguide structure (40). The ridge waveguide structure (40) comprises: a first slab layer (41) arranged on the side of the isolation layer (30) facing away from the substrate (20); and a ridge layer (42) arranged on the side of the first slab layer (41) facing away from the isolation layer (30). The first metal layer (50) extends towards the ridge waveguide structure (40) to the side of the first slab layer (41) facing away from the isolation layer (30), so as to cover the edges of two sides of the first slab layer (41), thereby reducing the electromagnetic field leakage on the two sides of the first slab layer (41) of the ridge waveguide structure (40), making an electric field entering the ridge waveguide structure (40) more concentrated, and thus improving the modulation efficiency of the optical waveguide modulation device (10).

The present disclosure provides a thermo-optic phase modulation apparatus and an optical phase modulator. The thermo-optic phase modulation apparatus comprises: a substrate; an isolation layer disposed on the substrate; an integrated waveguide structure disposed on a side of the isolation layer facing away from the substrate, and comprising a first waveguide and a second waveguide, the first waveguide being disposed on the side of the isolation layer facing away from the substrate, the second waveguide being disposed on a side of the first waveguide facing away from the substrate, and a projection of the second waveguide in a first direction Z being located above the first waveguide; and a cladding layer disposed on a side of the first waveguide facing away from the isolation layer and covering the integrated waveguide structure. The first waveguide has a first refractive index, the second waveguide has a second refractive index, and the first refractive index is different from the second refractive index. The technical solution of the embodiments of the present disclosure enables an optimized configuration of thermo-optic phase modulation apparatus functions, and in particular improves thermal modulation efficiency of thermo-optic phase modulation apparatuses.

A fiber optic gyro device capable of improving the accuracy of the detection results of the fiber optic gyro device is provided. [Solution] This fiber optic gyro device includes a light source module 1, an optical fiber cable 2, an optical fiber coil 4 into which light passing through the optical fiber cable 2 in one direction is branched and enters from both one end and the other end, an optical phase modulator 3 that changes the phase of the light passing through the optical fiber coil 4 using a signal of a drive frequency DF and a feedback signal FS, a light source drive circuit 10 that drives the light source module 1, a power supply circuit 11 that has a switching circuit 111 that performs DC / DC conversion and supplies power to the light source drive circuit 10, a temperature sensor 13 that measures the temperature of the power supply circuit 11, and a control circuit 12 that controls the switching frequency SF of the switching circuit 111 based on the measurement result of the temperature sensor 13 so that the switching frequency SF is different from an integer multiple of the drive frequency DF.

A source for providing electromagnetic radiation within a particular spectral range, including: a ring-shaped optical resonator for circulating a plurality of wavelength bands including: a first optical phase modulator, a first chomatic dispersion device, a second optical phase modulator, a multi-line spectral domain filter, a second chromatic dispersion device, and an optical amplifier; a controller coupled to the first optical phase modulator and the second optical phase modulator which is configured to drive the first optical phase modulator with a first waveform and the second optical phase modulator with a second waveform, the first chromatic dispersion device being configured between the first optical phase modulator and the second optical phase modulator to provide chromatic dispersion so as to subject each of the plurality of wavelength bands to a respective plurality of different time delays, the first and second optical phase modulators being configured to create spectral broadening.

The application relates to a light pulse phase extraction recovery system suitable for the field of laser spectrum and optical measurement. The light pulse phase extraction recovery system comprises a to-be-measured light pulse (1), a first 1*2 optical coupler (121), a second 1*2 optical coupler (122), a first optical spectrum analyzer (21), a second optical spectrum analyzer (22), a first square operator (41), a second square operator (42), a first dispersive optical fiber (31), a second dispersive optical fiber (32), an optical phase modulator (4), a waveform generator (5), an electrical frequency spectrum analyzer (6), a difference operator (7), a convolution operator (8), a division operator (9) and an integral operator (10).

The invention provides a spectral line width adjusting method and an electronic device manufacturing method. The spectral line width adjustment method includes: a first step of adjusting at least one of a timing of a first trigger signal that amplifies a portion of a first pulse laser beam and converts the amplified portion into a second pulse laser beam and a timing of a second trigger signal that amplifies a portion of a second continuous light and converts the amplified portion into a third pulse laser beam; a first spectrum in which the spectrum of a fourth pulse laser beam obtained by sum-frequency mixing the second pulse laser beam and the third pulse laser beam is adjusted to a non-Gaussian shape; and a second step in which a modulation signal generator generates a modulation signal of the same mode synchronized with the light emission trigger signal, and supplies the modulation signal of the same mode to the optical phase modulator, thereby modulating the wavelength of the second continuous light for a time corresponding to one pulse of the third pulse laser light, and outputting the second continuous light. The spectrum of the fourth pulse laser light is adjusted to a second spectrum having a spectral line width wider than the first spectrum.

A spatial optical phase modulator includes microcells each of which is constituted by an optical phase modulator. Each of the microcells includes a magnetization free layer having a first optically effective surface and a second optically effective surface opposite to the first optically effective surface and conductor that controls a direction of magnetization of the magnetization free layer to be parallel or substantially parallel to normal directions of the first optically effective surface and the second optically effective surface.

An optical phase modulator includes a block constituting a magnetic free layer and having a first face, a second face opposite to the first face, an entrance face different from the first face or the second face and through which light enters, and an exit face different from the first face or the second face and through which light exits. The optical phase modulator includes a first electrode disposed to the first face, either directly or not directly on the first face.