59 results about "Optical interferometer" patented technology

A glass including silica and titania is disclosed. An average hydroxyl concentration of a plurality segments of the glass is in a range from about 20 ppm to about 450 ppm, an average titania concentration of the plurality of segments is in a range from about 6 wt. % to about 12 wt. %, and each segment of the plurality of segments has a length of about 12.7 mm, a width of about 12.7 mm, and a height of about 7.62 mm. The hydroxyl concentration of each segment is measured using a Fourier transform infrared spectroscopy in transmission, the refractive index is measured using an optical interferometer with a 633 nm operating wavelength and a resolution of 270 microns×270 microns pixel size, and the average titania concentration is determined based upon the measured refractive index.

A method and apparatus for the characterization of matter is described. Light from or modulated by the matter is analyzed by means of the spectral correlation. The spectral correlation can report on the composition, static and temporally dynamic characteristics of the matter. The amplitude and temporal characteristics of the spectral correlation are measurement features that report on properties of matter, or changes in local molecular forces, chemical composition, molecular structure, shape, size, charging state, mass, and more. The advantage of spectral correlation of scattered light lies in the increased time-resolution and minimized noise in the spectroscopic characterization of matter, in particular in the characterization of fluctuations. In one embodiment, an apparatus may combine an optical system to illuminate the matter, collect scattered photons, direct these photons into an optical interferometer, and the time-resolved detection of the photons. By performing temporal intensity correlation of the light after the interferometer the spectral correlation is obtained.

The application discloses a vortex light interference device and method for measuring three-dimensional vibration and sound field rotation characteristics, wherein a helium-neon laser emits laser light, the laser light passes through a half-wave plate and a first polarization beam splitter prism, and is divided into object light and reference light; the object light passes through a first spiral phase plate and becomes vortex object light, the vortex object light passes through a second polarization beam splitter prism, a quarter-wave plate, and a beam expander lens, and is irradiated on a test sample surface, reflected light of the sample surface passes through the beam expander lens, the quarter-wave plate, the second polarization beam splitter prism, a beam splitter prism and a focusing lens, and is irradiated on a photodetector; the reference light passes through an acousto-optic modulator to generate frequency modulation, passes through a mirror and a second spiral phase plate to become frequency-modulated vortex light, and the vortex light passes through a beam splitter prism and a focusing lens and is irradiated on the photodetector; a computer calculates and demodulates frequency-modulated signals of the photodetector and modulation signals of the acousto-optic modulator, and finally obtains three-dimensional vibration information and sound field rotation characteristics of the sample.

The application provides a multipoint strain sensor with temperature compensation based on a Bragg grating and an optical FMCW interferometer. The multipoint strain sensor with temperature compensation is characterized in that it is composed of a sweep laser 1, an optical coupler 2, an auxiliary interference device 3, a main interference device 4, a multiplexing device 5, a data acquisition card 6 and a data processing computer 7. The application can be used for real-time monitoring and measurement of multipoint quasi-distributed strain after temperature compensation, and can be widely used in the fields of aviation, ship engineering, bridge measurement and structural health monitoring.

This optical module is provided with: a semiconductor laser (5); and an optical monitor (6) that receives the laser light from the semiconductor laser (5) and outputs a first monitoring value and a second monitoring value for estimating the intensity and wavelength of the laser light from the semiconductor laser (5). The optical monitor (6) constitutes an optical interferometer having: a first optical coupler (61a) that receives laser light from the semiconductor laser (5); a second optical coupler (61b) that receives laser light from the semiconductor laser (5); a first light receiver (65a) that outputs a first monitoring value; and a second light receiver (65b) that outputs a second monitoring value, and a first path from the first optical coupler (61a) to the first light receiver (65a) and a second path from the second optical coupler (61b) to the second light receiver (65b) are asymmetrical.

There is provided a device for phase noise compensation for a frequency modulated continuous wave, FMCW, light detection and ranging, LIDAR, system, said device comprising: an optical interferometer receiving a light signal from a source of the LIDAR system, splitting the light signal into a first and a second light signal into a first and a second path having a preset delay therebetween, and combining the light signals having passed the first and the second path, a detector detecting the combined light signals; a phase noise determination module receiving the detected signal and determining a plurality of phase noise signals corresponding to integer numbers of the preset delay; and a phase noise compensation module receiving and processing a LIDAR response signal in a plurality of branches, and for each branch, compensating phase noise in the LIDAR response signal using one of the phase noise signals, and determining a fast Fourier transform, FFT, of the compensated signal for a specific range of distances to a target, the branches being configured to determine the FFT for mutually unique ranges.

A combinatorial optimization problem processing device 100 comprises: a 1 × 2 Mach-Zehnder optical modulator 10 for receiving and modulating a polarization clock pulse train; an optical interference circuit 20 for receiving the polarization clock pulse train modulated by the 1 × 2 Mach-Zehnder optical modulator 10 and generating a predetermined interaction in an Ising model at a period of N pulses of the polarization clock pulse train; a modulating signal generation unit 40 for generating the modulating signal of the 1 × 2 Mach-Zehnder optical modulator 10 by waveform-shaping an electric signal obtained by photoelectrically converting an optical signal output from the optical interference circuit 20 and outputting a monitor signal representing the solution of an optimization problem to the outside; and an initialization control unit 30 for creating a neutral state for interaction between elements to initialize the optical interference circuit 20, by controlling the optical interference circuit 20 to reduce attenuation of the polarization clock pulse train input to the optical interference circuit 20. The combination optimization problem of the N elements is processed in association with the Ising model.

The present invention provides a phase shifter that can be manufactured using a CMOS process, exhibits low optical propagation loss, can maintain refractive index changes without power supply, and allows for the resetting of those refractive index changes. [Solution] The phase shifter 100 of the present invention comprises an optical waveguide 101 composed of a core 105 and a cladding 106 surrounding the core 105, a substrate 102 on which the optical waveguide 101 is mounted, a heating means 103 for heating the core 105, and an ultraviolet irradiation means 104 for irradiating the core 105 with ultraviolet U, wherein the core 105 mainly contains silicon nitride, and the density of silicon dangling bonds of silicon nitride is 10 in terms of spin density 18 cm -3 The above 10 20 cm -3 The following applies:

The invention relates to a high-precision small-F-number divergent interferometer standard lens and an optical interferometer. The lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from left to right. The whole lens uses a double-Gaussian configuration, incident parallel light is converged and then diverged, the aperture of the lens is gradually reduced from the first lens to the fourth lens and then gradually increased from the fourth lens to the seventh lens, and the first surface of the seventh lens is an aspheric surface. The divergent lens has the characteristics of reasonable design, strong machinability and small F number, can be used for an interferometer to detect lens surfaces with more R numbers, can reduce the working length of the interferometer, and has a relatively ideal wavefront value.

The invention discloses a portable asymmetric optical interferometer for wide-area three-dimensional topography measurement, and relates to the technical field of wide-area three-dimensional topography measurement, and the portable asymmetric optical interferometer comprises a multifunctional storage box, a sealing cover is rotatably installed on the multifunctional storage box, universal wheels are symmetrically installed at one end of the multifunctional storage box, and a pull rod is installed at the other end of the multifunctional storage box. According to the invention, through the design of the multifunctional storage box and the cooperation of universal wheels and a pull rod, easy push-and-pull movement by a single person is realized, the multifunctional storage box can be directly put into a common vehicle for transportation, and the transportation cost and difficulty are greatly reduced; the storage box is made of light and hard materials, the overall size of the device is reduced, the weight is reduced, reliable protection can be provided for the interferometer in the transportation process, and the problem that traditional equipment is difficult to adapt to moving scenes such as workshop multi-station rotation and off-line detection in different places is effectively solved.

The optical interferometer comprises: a broadband light source that outputs a first light in a given frequency domain with suppressed relative intensity noise (RIN); a wavelength divider that divides the first light into a first component and a second component with a center wavelength different from the first component and outputs the second component; a first optical path that propagates the first component output from the wavelength divider; a second optical path that propagates the second component output from the wavelength divider; and a wavelength synthesizer that combines the first component propagating in the first optical path and the second component propagating in the second optical path as a second light output.

According to the scheme, the all-fiber mechanical vibration sensor which is based on the magneto-optical effect and senses vibration motion through the optical technology is provided, the modern optical fiber technology and the optical interferometer principle are utilized, optical fibers are adopted as sensing materials and optical transmission materials, and sensing of mechanical vibration to be detected is achieved through light beams in the optical fibers. Sensing parts do not contain devices which are susceptible to external electromagnetic interference and damage the insulation degree, such as conductive wires, and optical sensing vibration information can be accurately and safely completed in a passive, non-contact and loss-free manner at a high speed. The optical fiber sensing device has the advantages of simple optical fiber sensing structure, small size, high reliability, high response speed, wide signal frequency band, high safety and the like. The all-fiber mechanical vibration sensor can be used for sensing and monitoring vibration states and vibration characteristics of various rotating machines, and can also be used for optically sensing and monitoring vibration states of non-rotating machines, so that the mechanical equipment can realize intelligent and safe operation.

This invention discloses a method for extracting the wavefront tilt of astronomical optical interferometers. The method includes: acquiring an astronomical optical interferogram; preprocessing the interferogram using two-dimensional envelope detection normalization; performing anticosine phase unwrapping on the preprocessed interferogram to obtain the relative phase distribution of the wavefront; obtaining the tilt term coefficients through Zernike polynomial fitting and calculating the relative wavefront tilt. This invention can be applied to the extraction of the wavefront tilt of astronomical optical interferometers.

The application discloses a long-base optical interference system and an optical path collimation method, and comprises an interference terminal and two optical path devices; the optical path device comprises a parallel light tube, a reflecting telescope and a guide star system; parallel light generated by the parallel light tube enters the guide star system after the reflecting telescope; the guide star system comprises a light splitting prism, a first mirror, a first lens, a second mirror and a guide star camera; the parallel light entering the guide star system is split into transmitted light and reflected light by the light splitting prism, wherein the reflected light sequentially passes through a folded axis structure composed of the first mirror, the first lens and the second mirror, and enters the guide star camera; the transmitted light split by the light splitting prism of the guide star system of the two optical path devices is respectively a first light beam and a second light beam; the interference terminal focuses the first light beam and the second light beam after beam combination, and then the first light beam and the second light beam propagate to the interference terminal camera. The system can be applied to outdoor observation, and the method is used for optical path collimation of the long-base optical interference system, so that stable optical interference fringes are obtained.

Described herein are compact, high-power tunable optical sources with precise wavelength control. The tunable optical sources developed by the inventors and described herein use laser arrays that are compatible with wavelength division multiplexing (WDM) schemes, making these sources particularly suitable for use in applications requiring high levels of data throughput. These sources use integrated wavemeters to measure the wavelength of optical emission. These wavemeters are formed monolithically on the same substrate hosting the laser array, resulting in a much smaller footprint than what is possible using conventional, external instrumentation. The wavemeters described herein use optical interferometers as part of a feedback control loop to ensure that the lasers emit light at the desired carrier wavelengths. A wavemeter can map the wavelength of emission of a laser to the wavelengths of emission of a calibrated optical source.

A method includes causing activation, at a first time, of a first set of squeezed light sources from a plurality of squeezed light sources of a Gaussian boson sampling (GBS) circuit. At a second time after the first time, a first photon statistic is detected at a first output port from a plurality of output ports of the GBS circuit. At a third time after the first time, a second set of squeezed light sources from the plurality of squeezed light sources of the GBS circuit is activated, the second set of squeezed light sources being different from the first set of squeezed light sources. At a fourth time after the third time, a second photon statistic is detected at a second output port from the plurality of output ports of the GBS circuit. At least one transformation matrix is estimated that represents a linear optical interferometer of the GBS circuit based on the first photon statistic and the second photon statistic.

The present invention comprises one or a plurality of optical interferometers including a plurality of arm waveguides (216) that guide respective light split at optical splitting units (330a, 331a, and 332a) to optical multiplexing units (332b, 331b, and 219), the light undergoing different phase changes between different arm waveguides. The optical splitting units and the optical multiplexing units are arranged in a direction different from the direction in which the end face of the optical splitting unit (330a, 331a or 332a) from which the light is outputted and the end face of the optical multiplexing unit (332b, 331b or 219) to which the light is inputted face each other. Each of the arm waveguides (216) has a shape along a path that includes a curved portion in accordance with the different direction mentioned above between the output end face of the optical splitting unit and the input end face of the optical multiplexing unit. The optical path length difference between different arm waveguides on the path including the curved portion is less than or equal to the wavelength of the light.

The invention discloses a multimode optical fiber spot homogenizing device for a spherical optical interferometer, which comprises an ultrasonic oscillation cavity, the ultrasonic oscillation cavity is filled with coupling liquid, the temperature of the coupling liquid is adjusted through a temperature control device, a stress adjusting device is fixedly arranged in the ultrasonic oscillation cavity and is soaked in the coupling liquid, and the stress adjusting device is used for adjusting the temperature of the coupling liquid. The stress adjusting device adjusts mechanical stress borne by the multimode optical fiber, and the ultrasonic oscillation cavity is connected with the ultrasonic oscillator. The invention further discloses a multi-mode optical fiber light spot homogenizing method for the spherical optical interferometer, the refractive index of the multi-mode optical fiber is changed through microwave heating, and the output light spots of the multi-mode optical fiber are homogenized by combining the synergistic effect of mechanical stress and ultrasonic vibration. The device is simple in structure and convenient to operate, thermal damage to the multimode optical fiber is reduced, and long-term stable operation of equipment is facilitated.

A dual interferometer fibre optic gyroscope, comprising: a first optical interferometer comprising a first reference optical fibre and a first delay optical fibre wherein light in the first delay fibre experiences an optical delay with respect to the first reference fibre; a second optical interferometer comprising a second reference optical fibre and a second delay optical fibre wherein light in the second delay fibre experiences an optical delay with respect to the second reference fibre; wherein the first and second reference optical fibres are common; wherein the first and second delay optical fibres are common; and wherein the first and second reference optical fibres are not common with the first and second delay optical fibres.

Described herein are compact, high-power tunable optical sources with precise wavelength control. The tunable optical sources developed by the inventors and described herein use laser arrays that are compatible with wavelength division multiplexing (WDM) schemes, making these sources particularly suitable for use in applications requiring high levels of data throughput. These sources use integrated wavemeters to measure the wavelength of optical emission. These wavemeters are formed monolithically on the same substrate hosting the laser array, resulting in a much smaller footprint than what is possible using conventional, external instrumentation. The wavemeters described herein use optical interferometers as part of a feedback control loop to ensure that the lasers emit light at the desired carrier wavelengths. A wavemeter can map the wavelength of emission of a laser to the wavelengths of emission of a calibrated optical source.

The present invention addresses the need to implement a side rearview mirror monitoring system that detects malfunctions caused by temperature changes, vibrations, and impacts. A side rearview mirror monitoring system is provided, comprising fiber optic sensors integrated into the rearview mirror assembly and connected to the Door Control Module (DCU).The DCU unit comprises at least the following elements: a) an optical interferometer that measures the light wave reflected by the fiber optic sensors located inside each side rearview mirror; b) a digital signal processor (DSP), whose main characteristic is the processing of digital signals at the physical level; and c) a reference fiber optic section, which is a segment or section of the fiber optic sensor embedded and sealed with epoxy paste inside the DCU module to prevent movement. Once the temperature, pressure, and vibration data is collected and processed, the system can use this information to correct errors in the position of the side rearview mirrors or detect impacts to them. If these events occur, a signal can be sent to the DCU module's actuator to fold the exterior mirror to prevent damage and / or adjust its position.In addition, the system can also send notifications regarding the operation of the rearview mirrors to the BCM module via a vehicle's CAN bus.

An optimization problem processing device 100, 200 comprises: an optical interference circuit 20 for generating a prescribed interaction in an Ising model at a period of N pulses of a polarization clock pulse train; a multi-stage optical signal processing unit 30 for transitioning the optical power level of each pulse of the polarization clock pulse train in accordance with the power level of each pulse of an optical signal pulse train outputted from the optical interference circuit 20; and an initialization control unit 50 for controlling the multi-stage optical signal processing unit 30 to create a neutral state with respect to interactions between elements and initialize the optical interference circuit 20. The number of stages effectively operated among the multiple connected stages in the optical signal processing unit 30 is controlled in accordance with the scale of the combinatorial optimization problem. At the time of initialization, the initialization control unit 50 sets the number of stages in which the optical signal processing unit 30 transitions the polarization clock pulse train to be smaller than that at the time of a solution search, thereby creating a neutral state with respect to interactions between elements so as to initialize the optical interference circuit 20.

The invention relates to an optical processor (2), in particular to an optical interferometer, comprising: a plurality of processor input ports (5.1 to 5.4) for receiving input optical signals (4.1 to 4.4), a plurality of processor output ports (6.1 to 6.4) for emitting output optical signals (7.1 to 7.4), and an optical network (9) that connects the processor input ports (5.1 to 5.4) to the processor output ports (6.1 to 6.4) and comprises at least one layer (11) with a plurality of optical devices (10a-c) configured to process the input optical signals (4.1 to 4.4) from the processor input ports (5.1 to 5.4). The at least one layer (11) has a plurality of input ports (14.1 to 14.4) and a plurality of output ports (15.1 to 15.4) that are connected to the plurality of input ports (14.1 to 14.4) via optical delay lines (16.1 to 16.4). The invention also relates to an apparatus (1), comprising: an optical processor (2) as indicated above, a plurality of light sources (3.1 to 3.4) for generating the plurality of input optical signals (4.1 to 4.4) for the optical processor (2), and a plurality of optical detectors (8.1 to 8.4) for detecting the output optical signals (7.1 to 7.4) from the optical processor (2).

This disclosure provides transabdominal fetal oximetry (TFO) that uses frequency-modulated continuous-wave (FMCW) time-domain near-infrared spectroscopy to measure time-resolved reflectance values of light signals collected from a maternal-fetal multilayer tissue structure. In various embodiments, the disclosed FMCW time-domain near-infrared spectroscopy is configured to function as an optical interferometer that uses two frequency-swept laser sources of different center wavelengths λ1 and λ2 as probe lights to detect optical property in vascular tissues of the maternal-fetal multilayer tissue structure. The FMCW near-infrared spectroscopy is configured to collect light signals returned from the multilayer structure and generate a time-resolved reflectance curve based on the collected light signals.

This invention provides an adaptive fusion method for attitude jitter error noise in optical interferometers. The specific process is as follows: First, acquire multiple attitude jitter error noise data collected by differential wavefront sensitive angle measurement based on a four-quadrant detector, along with real-time operating status parameters of the DWS; unify the frame rate through adaptive downsampling; filter valid data through a two-layer validity judgment; achieve time synchronization using step calibration and dynamic compensation; construct a dual-objective adaptive weight calculation model based on an improved Adam optimizer, introduce a robust penalty term to suppress abnormal data interference, and calculate dynamic weight parameters in real time; fuse the weight parameter data to ensure stable fusion results and output optimal attitude jitter error noise data. This invention solves the problems of weak anti-interference capability, low fusion accuracy, and insufficient real-time performance of existing fusion methods. Through multi-stage collaborative optimization, it improves the accuracy and stability of attitude jitter error noise fusion, making it suitable for the complex and precise working scenarios of optical interferometers.

A phase shifter (100) according to the present invention is provided with: an optical waveguide (101) formed of a core (105) and a cladding (106) surrounding the core (105); a substrate (102) on which the optical waveguide (101) is mounted; a heating means (103) for heating the core (105); and an ultraviolet irradiation means (104) for irradiating the core (105) with ultraviolet rays U. The core (105) contains silicon nitride as the main component, and the density of silicon dangling bonds of the silicon nitride is 1018-1020 cm-3 as expressed in spin density.<sp / >

Sets of vectors are generated based on respective output signals from at least M+N detectors detecting different respective output modes emitted from one or more linear-optical interferometers (LOIs). A first set of vectors corresponds to an M-mode quantum state emitted from at least one of the LOIs. A second set of vectors corresponds to an N-mode quantum state emitted from at least one of the LOIs. A classifier is trained to classify each of a plurality of pairs of X-dimensional input vectors as a member of one of two or more different classes based on an X-1 dimensional hyperplane determined at least in part by the training, which comprises: receiving training data comprising at least one vector from the first set and at least one vector from the second set, and updating the X-1 dimensional hyperplane based at least in part on the training data (X ≥ M; X ≥N).

The invention provides an optical interferometer, a wavelength division multiplexer and a wavelength division multiplexing optical system.The optical interferometer comprises a first waveguide arm and a second waveguide arm which are oppositely arranged in the first direction; the first waveguide arm comprises a first width compensation part with a first width Wcw1 and a first thickness compensation part with a second width Wch1; the second waveguide arm comprises a second width compensation part with a third width Wcw2 and a second thickness compensation part with a fourth width Wch2; the first waveguide arm and the second waveguide arm meet the following conditions: Wcw1 is greater than Wn, Wch1 is smaller than or equal to Wn, Wcw2 is smaller than or equal to Wn, and Wch2 is greater than Wn; or Wcw1 is smaller than or equal to Wn, Wch1 is larger than Wn, Wcw2 is larger than Wn, Wch2 is smaller than or equal to Wn, and Wn is a preset value. According to the optical interferometer, the wavelength division multiplexer and the wavelength division multiplexing optical system provided by the embodiment of the invention, the compatibility of manufacturing errors can be improved.

A glass including silica and titania is disclosed. An average hydroxyl concentration of a plurality segments of the glass is in a range from about 20 ppm to about 450 ppm, an average titania concentration of the plurality of segments is in a range from about 6 wt. % to about 12 wt. %, and each segment of the plurality of segments has a length of about 12.7 mm, a width of about 12.7 mm, and a height of about 7.62 mm. The hydroxyl concentration of each segment is measured using a Fourier transform infrared spectroscopy in transmission, the refractive index is measured using an optical interferometer with a 633 nm operating wavelength and a resolution of 270 microns×270 microns pixel size, and the average titania concentration is determined based upon the measured refractive index.

A light detection and ranging (LiDAR) device includes a transmission unit configured to project a transmission signal toward an object, an optical element between the transmission unit and the object and configured to partially reflect the transmission signal projected by the transmission unit, a reception unit including at least one optical interferometer configured to generate a first optical signal by mixing a first reception signal reflected from the object with the transmission signal and a second optical signal by mixing a second reception signal reflected from the optical element with the transmission signal, and at least one photodetector (PD) configured to convert the first optical signal and the second optical signal into a first beat signal and a second beat signal, respectively, and a processor configured to generate a clock signal based on the second beat signal and correct the first beat signal based on the clock signal.