26 results about "Optical phase modulator" patented technology

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 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.

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.

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.

An apparatus for modulating optical waves includes: a slot waveguide structure comprising: a first higher refractive index structure doped to include regions having a first conductivity type; a second higher refractive index structure doped to include regions having the first conductivity type; and one or more slot regions between the first and second higher refractive index structures. The one or more slot regions have a lower refractive index than the first and second higher refractive index structures. The apparatus includes a first support structure that allows the first higher refractive index structure to move to change the size of at least one of the one or more slot regions. The first support structure is doped to include regions having a second conductivity type different from the first conductivity type. The apparatus includes a second support structure that allows the second higher refractive index structure to move to change the size of at least one of the one or more slot regions. The second support structure is doped to include regions having a second conductivity type.

The semiconductor optical phase modulator (1) includes: an optical phase modulation element (3); a first semiconductor optical amplifier (40) for amplifying light input to the optical phase modulation element (3); and a second semiconductor optical amplifier (50) for amplifying the modulation signal light output from the optical phase modulation element (3). The optical input terminal of the semiconductor optical phase modulator (1) is the optical input end face (40a) of the first semiconductor optical amplifier (40). The optical output terminal of the semiconductor optical phase modulator (1) is the optical output end face (50a) of the second semiconductor optical amplifier (50).

The invention provides a silicon photon gyroscope with current modulation and intensity noise compensation functions. The silicon photon gyroscope comprises a silicon photon chip and a special integrated circuit, a silicon photon chip integrating a light source, a detector, a coupler and an on-chip ring is adopted, a traditional LN optical phase modulator is not adopted to achieve signal modulation, square wave signal modulation is carried out on a driving current end of a laser, and due to the fact that the laser has a large modulation bandwidth, the requirement for high-rotating-speed application of the silicon photon gyroscope can be met; the design end of the optical chip is smaller in size and lower in cost; an intensity noise compensation function is integrated in the ASIC circuit, intensity noise introduced by current modulation and external factor changes of the single-chip silicon photon gyroscope can be effectively suppressed, the precision of the silicon photon gyroscope is improved, and the ASIC circuit has the technical advantages of small size, low cost and simple production.

Embodiments described herein may be related to optical devices and apparatuses directed to forming waveguides and optical phase modulators that enable high baud rate modulation. In one embodiment, an optical phase modulator includes: photonic optical waveguides having their cladding regions and electrical contacts formed by material with its absolute permittivity near zero (ENZ), and their waveguide core region formed by electro-optical (EO) material or silicon PN junction whose optical refractive index changes with strength of externally applied electrical field. The ENZ material described herein further possesses properties of both optical transparency at operating wavelength and electrical conductivity. The ENZ claddings and electrodes may further have dimensions to enable high externally applied electrical field within waveguide core. The EO material described herein includes but not limited to organic polymers, LiNbO3, liquid crystals. Other embodiments are described and claimed.

A photonic device (10) is proposed for transmitting radio frequency signals (SEn) from at least one RF source. The device comprises: - an optical signal generator (110) for generating N optical signals (S1n), - N optical phase modulators (120-n), each capable of phase-modulating an optical signal (S1n) from an RF signal (SEn), and adapted to deliver a phase-modulated optical signal (S2n), - a demodulator (140) adapted to generate at least one phase-demodulated optical signal (S4, S4n) from at least one optical signal (S2n), and - at least one converter (150) adapted to convert each demodulated optical signal (S4, S4n) into an output signal (S5, S5n) defined in the RF domain, transmitted to at least one receiving unit, and carrying useful information from at least one of the RF signals (SEn). Figure for the abridged version: [Fig.1]