37 results about "Optical gyroscope" patented technology

The invention provides a method and a system for realizing a weak measurement enhanced chip-level microcavity gyroscope. The method comprises the following steps of: 1, providing a coherent state input by a system by using a single-frequency laser; 2, the output of the single-frequency laser is switched between a first path and a second path through an optical switch, the laser beam is transmitted to the first path in the first half part of the period, and the laser beam is transmitted to the second path in the second half part of the period; 3, the light transmitted along the first path and the second path respectively passes through an optical resonant cavity to sense the rotation angular speed, and a weak value amplification effect is achieved by setting front and back selection states; and step 4, weak measurement enhanced output results transmitted along the first path and the second path are respectively received by a photoelectric detector, and the value of the rotation angular velocity is demodulated according to the obtained output results. According to the invention, the optical microcavity is used as a sensing unit of the gyroscope, the sensing performance of the integrated optical gyroscope is greatly enhanced through a weak measurement technology, and the whole set of system can realize chip-level integration.

The lithium niobate-silicon nitride waveguide structure comprises a silicon substrate layer, a first silicon oxide isolation layer, a second silicon oxide isolation layer, a lithium niobate thin film layer and a silicon oxide dielectric layer which are stacked in sequence, the second silicon oxide isolation layer is wrapped with a silicon nitride layer; the thickness of the second silicon oxide isolation layer between the silicon nitride layer and the lithium niobate thin film layer is 50 + / -10nm; the thickness of the silicon nitride layer is 400 + / -10nm, and the thickness of the lithium niobate film layer is 600 + / -50nm; the silicon oxide dielectric layer is provided with at least two electrodes which are arranged at intervals. According to the lithium niobate-silicon nitride waveguide structure, the preparation method and the optical gyroscope provided by the invention, on the basis of the advantages of silicon nitride and lithium niobate materials, an ultra-low-loss silicon nitride waveguide, an ultra-high-Q-value micro-ring resonator and a high-modulation-rate lithium niobate modulator are obtained at the same time through a lithium niobate and silicon nitride hybrid integration method; and thus, the overall performance of the resonant integrated optical gyroscope is improved.

An interferometric resonator optical gyroscope includes an optical frequency comb generator configured to generate an optical frequency comb. Optical signals representative of the optical frequency comb pass through an optical resonator in different directions, and a rotation rate is determined based on the extent of interference between the optical signals. Parameters of the optical frequency comb generator can be controlled by a control servo based on an intensity of the optical signals after propagating in the optical resonator. Utilizing an optical frequency comb generator reduces the bias error during gyroscope operation.

The present invention provides an integrated interferometric optical gyroscope, assembly, system, and method for calculating rotational speed, the gyroscope comprising a light source module, a first coupling module, a second coupling module, at least two polarization-separated rotation modules, a photoelectric detection module, and a helical waveguide module, the two polarization-separated rotation modules each connected to the distal and proximal ends of the helical waveguide module, each converting two optical beams in a TE polarization state into two polarization states, TE and TM, transmitting them to both ends of the helical waveguide module, transmitting them in opposite directions within the helical waveguide module, receiving the two optical beams after they have passed through the helical waveguide module, and converting both polarization states back to the same TE mode, the gyroscope does not use a circulator or 50 / 50 coupler, avoids reflected light waves to the light source, and eliminates the influence of system errors, drift or disturbances, changes in ambient temperature, etc. on the performance stability of the gyroscope.

The invention provides an angular velocity detection system and method based on weak measurement, which can be applied to the technical field of quantum sensing and the technical field of optical gyroscopes. The system comprises a laser emitting initial light; the front selection module performs phase adjustment on two parts of light in the initial light; the first optical resonant cavity transmits the first path of light along an anticlockwise path; the second optical resonant cavity transmits the second path of light along a clockwise path; the post-selection module couples the first path light with a first part of light in the second path light to obtain first interference light; the detection module detects the first interference light to obtain first light intensity; the processor obtains a linear coefficient according to the preset phase, the initial light intensity of the initial light and the transmission coefficient; according to the first light intensity, the linear coefficient and the preset phase, the rotation angular velocity is obtained, the optical microcavity serves as a sensing unit of the gyroscope, the sensing performance of the integrated optical gyroscope is enhanced through the weak measurement technology, and the detection precision of the rotation angular velocity is improved.

The invention discloses an all-normal dispersion super-continuum spectrum driven resonant optical gyroscope and a working method thereof, and belongs to the field of optical gyroscopes. The input end of the mode-locked laser ML is connected to a left port of the full-normal dispersion photonic crystal fiber ANDi-PCF, input ports of the full-normal dispersion photonic crystal fiber ANDi-PCF and the photoelectric detector PD are connected to two left ports of the circulator CIR respectively, and a right port of the circulator CIR is connected with a left port of the multifunctional integrated optical chip MIOC. And two ports on the right side of the multifunctional integrated optical chip MIOC are respectively connected with two ports of the waveguide ring resonator WRR. Based on the resonance mode of the full-normal dispersion super-continuum spectrum excitation waveguide ring resonator, the influence of relative intensity noise and shot noise on the gyroscope performance is further reduced by using the broadband and smooth light source spectrum pattern, and finally the angle random walk of the gyroscope is promoted.

The present invention primarily relates to a compound of formula (I) as defined herein and to a mixture comprising or consisting of one or more compound(s) of formula (I) as defined herein and optionally one or more host material(s). Moreover, the present invention relates to the compounds of formula (II) to (VIII) as defined herein and to further specific compounds as defined herein. The present invention also relates to an electro-optic film and an electro-optic modulator-device as defined herein and to a method for manufacturing an electro-optic modulator-device comprising or consisting of the steps as defined herein. Lastly, the present invention relates to the use of a compound of formula (I) or of a mixture as defined herein or of an electro-optic film as defined herein or of an electro-optic modulator-device as defined or as manufactured herein in a field selected from the group consisting of nonlinear optics, Mach-Zehnder modulators, silicon organic hybrid electro-optic modulators, materials for devices or arrangements for the control of the intensity, color, phase, polarization or direction of light arriving from an independent light source, preferably switching, gating, or modulating, photonic communication networks, optical data transmission, preferably in 6G applications, phased array radars, satellite and fiber telecommunications, cable television (CATV), optical gyroscopes for application in aerial and missile guidance, electronic counter measure (ECM) systems, backplane interconnects for high-speed computation, ultra-quick analog-to-digital conversion, land mine detection, radio frequency photonics, programmable photonics, cryo-communications, quantum computing, spatial light modulation, and all-optical (light-switching-light) signal processing.

This invention proposes a resonant micro-optical gyroscope based on a variable fiber beam splitter and its closed-loop control method, belonging to the field of resonant optical gyroscope technology. It includes a laser, a variable fiber beam splitter, phase modulators PMⅠ and PMⅡ, circulator Ⅰ and circulator Ⅱ, a 95% 2×2 coupler, photodetectors PDⅠ and PDⅡ, a whispering-gallery resonator, a digital-to-analog interface, a digital system, and an analog-to-digital interface. This invention achieves a dual-closed-loop structure by designing a Schmitt-type closed-loop switching, a linear region judgment scheme, and an automatic reset operation, thereby improving the linearity and dynamic range of the ROG output.

A technique is provided for reducing angle random walk (ARW) noise in a resonant optical gyroscope (ROG) using a pair of optical frequency combs. The ARW noise is reduced by propagating each optical frequency comb through a dispersive optical component. As a result, at least some of the spectral components, of an optical frequency comb emitted from a dispersive optical component, are no longer phase locked. As a result, ROG rotation rate accuracy is increased.

Embodiments utilize an optical frequency comb generator coupled to an optical resonator of an optical gyroscope. The optical frequency comb generator generates an optical frequency comb having frequency peaks that each correspond to a respective resonance frequency of the optical resonator. A control servo can be coupled to the optical frequency comb generator and controls the optical frequency comb output from the optical frequency comb generator. In doing so, the optical frequency comb remains tuned to the resonance frequencies of the optical resonator during gyroscope operation.

The invention provides a sensitive ring structure applied to an interference type integrated optical gyroscope and a preparation method of the sensitive ring structure. A first waveguide layer, a coupling layer and a second waveguide layer are sequentially formed on a substrate, a plurality of oxide layers are formed, and the first waveguide layer, the coupling layer and the second waveguide layer are all wrapped in the oxide layers; a first interlayer is arranged between the first waveguide layer and the coupling layer, a second interlayer is arranged between the coupling layer and the second waveguide layer, and finally the sensitive ring structure applied to the interference type integrated optical gyroscope is formed. When coupling transmission is carried out between the first waveguide layer and the second waveguide layer, no cross phenomenon exists between the output waveguide and the waveguide coil, so that crosstalk between the waveguides can be reduced, transmission loss between the waveguides can be reduced, and the distance between the first waveguide ring and the second waveguide ring is not too close due to the existence of the coupling layer. And inter-layer coupling crosstalk can be further reduced.

The invention discloses a random polymorphic wave modulation method of an interference type integrated optical gyroscope, which aims at a scene that the integration level of the integrated optical gyroscope is improved by compressing the length of an interference loop, the modulation frequency is obviously increased and crosstalk noise is introduced, and comprises the following steps of: firstly, according to a constraint condition and a preset modulation sequence library; generating a pseudo-random number sequence to construct a multi-state selector, and randomly selecting the sequence output at the current moment; generating another pseudo random number sequence at the same time; and a time-varying composite modulation generation matrix is constructed, and random multi-state wave modulation signals are uniformly represented and output. Then, collecting a digital quantity corresponding to the light intensity signal, and completing the angular velocity calculation of the integrated optical gyroscope through a demodulation sequence; according to the method, modulation voltage randomization is realized through a random polymorphic wave sequence state transition path, so that the crosstalk noise mean value is suppressed to be 0, the crosstalk noise introduced by high modulation frequency in the integrated optical gyroscope is effectively suppressed, and finally the dead zone of the gyroscope is reduced.

The invention provides a modular chip and an optical gyroscope chip. The modular chip comprises a plurality of branch optical paths; each branch optical path comprises a branch optical waveguide, a first evanescent wave coupler, a phase modulator, a second evanescent wave coupler and a first optical port coupler; the first end of the branch optical waveguide is divided into a plurality of waveguide branches, and each waveguide branch is connected with one branch optical path; the first end of the first evanescent wave coupler is connected with the first end of the waveguide branch, and the second end of the first evanescent wave coupler is connected with the first end of the phase modulator; the second end of the phase modulator is connected with the first end of the second evanescent wave coupler, and the second end of the second evanescent wave coupler is connected with the first end of the first optical port coupler; the second end of the branch optical waveguide is configured to be connected with an active or passive device, and the second end of the first optical port coupler is configured to be connected with an external element. According to the invention, a plurality of elements in the chip are integrated in the modular chip and are used for being connected with a plurality of elements, so that the universality of the chip is improved, and the cost is reduced.

A gyroscope comprises a source emitting a broadband beam, and a first waveguide arrangement that splits the beam into CCW and CW beams. First and second phase modulators are coupled to the waveguide arrangement and provide phase modulations or frequency shifts to the CCW and CW beams. An optical resonator is in communication with the phase modulators such that the CCW and CW beams are optically coupled into the resonator. A second waveguide arrangement receives the CCW and CW beams transmitted from the resonator. First and second RIN detectors are coupled to the second waveguide arrangement and respectively receive the CCW and CW beams. A rate detector receives the CCW and CW beams. A rate calculation unit receives intensity noise signals from the RIN detectors, and rate and intensity noise signals from the rate detector. The rate calculation unit performs a RIN subtraction technique to reduce intensity noise limited ARW.

Aspects of the present disclosure are directed to the monolithic integration of an optical gyroscope fabricated on a planar silicon platform as a photonics integrated circuit with a MEMS accelerometer on the same die. The accelerometer can be controlled by the electronic circuitry that controls the optical gyroscope. Gaps may be introduced between adjacent waveguide turns to reduce crosstalk and improve the sensitivity and packing density of the optical gyroscope.

The present application relates to the technical field of optical gyroscopes, and specifically relates to a resonant fiber-optic gyroscope driven by a low-power broadband light source and a working method thereof. The fiber-optic gyroscope comprises an ASE light source, a circulator, a Y waveguide, a fiber resonant cavity, a first coupler, a second coupler, a photoelectric detector, and a signal processing unit. The ASE light source is connected to the circulator, and the circulator is connected to the input port of the Y waveguide and the photoelectric detector. The first coupler and the second coupler each have four ports. The Y waveguide is connected to port 1 of the first coupler and port 1 of the second coupler. The fiber resonant cavity is composed of the first coupler, the second coupler, and a section of fiber coil. Port 2 of the first coupler and port 2 of the second coupler are through-arm ports, and port 2 of the first coupler and port 2 of the second coupler are connected by means of 90° polarization axis rotation fusion splicing polarization maintaining optical fiber. The present application can significantly improve the utilization rate of the light source, effectively improve the stability and sensitivity of the system, and has significant engineering application potential.

The invention belongs to the technical field of inertial sensors, and discloses a resonant optical gyroscope based on a wide-spectrum active cavity, which adopts the collaborative design of a wide-spectrum light source and an active resonant cavity (integrated EDFA or SOA) to realize closed-loop self-oscillation and angular velocity measurement. The system comprises core units such as a broadband light source, a circulator, a multifunctional integrated chip, a coupler, an active resonant cavity, a photoelectric detector and a signal processing module. When the gyro system rotates spatially, the self-excitation frequency of light in the clockwise direction and the self-excitation frequency of light in the anticlockwise direction in the active resonant cavity generate Sagnac frequency shift, and the frequency difference of the clockwise light and the anticlockwise light is detected through light combination interference to solve the angular velocity of spatial rotation. Loss is compensated through light amplification in the resonant cavity, clockwise and anticlockwise resonant amplified light is generated through self-excitation, the signal-to-noise ratio of output signals of the gyroscope can be remarkably increased, chip-level microminiaturization integration is supported, and the gyroscope is suitable for high-precision inertial navigation, automatic driving and aircraft attitude control.

This invention provides an integrated interferometric optical gyroscope, components, system, and method for calculating rotational speed information. The gyroscope includes: a light source module, a first coupling module, a second coupling module, at least two polarization separation and rotation modules, a photoelectric detection module, and a helical waveguide module. The two polarization separation and rotation modules are respectively connected to the distal and proximal ends of the helical waveguide module, used to convert two light waves with the same TE polarization state into TE and TM polarization states, and send them to both ends of the helical waveguide module, so that they are transmitted in opposite directions in the helical waveguide module. Then, the two light beams after passing through the helical waveguide module are received and their polarization states are converted back to the same TE mode. This gyroscope eliminates the use of circulators or 50 / 50 couplers, avoids reflected light waves to the light source, and eliminates the impact of system errors, drift or disturbances, and environmental temperature changes on the stability of the gyroscope performance.

The invention provides a full-on-chip integrated three-axis multiplexing silicon optical gyroscope, which is characterized by comprising an X sensitive axis silicon-based silicon nitride double-layer waveguide ring 1, a Y sensitive axis silicon-based silicon nitride double-layer waveguide ring 2; a multifunctional integrated photon chip 3; a semiconductor chilling plate (TEC) 4; an ASIC circuit (5); an X sensitive axis waveguide ring photon lead 6; the X sensitive axis silicon-based silicon nitride double-layer waveguide ring 1 is connected with the multifunctional integrated photon chip 3 through the photon lead wire 6; the Y-sensitive axis silicon-based silicon nitride double-layer waveguide ring 2 is connected with the multifunctional integrated photon chip 3 through a photon lead 7; and the ASIC circuit 5 and the TEC 4 are connected with the multifunctional integrated photon chip 3 through a photoelectric co-packaging technology.

The invention relates to the technical field of optical devices, and discloses a polarizer, a parameter determination method of the polarizer and an optical gyroscope.The polarizer comprises a first coupling waveguide, a second coupling waveguide, a first bent waveguide, a second bent waveguide, a first transmission waveguide and a second transmission waveguide which are arranged on a silicon-based chip; the first coupling waveguide and the second coupling waveguide are arranged at an interval, and the center line of the first coupling waveguide in the light transmission direction is parallel to the center line of the second coupling waveguide in the light transmission direction; when the first coupling waveguide transmits an optical signal containing target polarized light and non-target polarized light, the non-target polarized light is coupled to the second coupling waveguide, and the non-target polarized light in the second coupling waveguide is output from the silicon-based chip through the first bent waveguide and the first transmission waveguide, or is output through the second bent waveguide and the second transmission waveguide. According to the invention, unnecessary polarized light is filtered through coupling, and a high polarization extinction ratio can be brought to a system with low insertion loss while integration with a silicon optical device is realized.

An interferometric resonator optical gyroscope includes an optical frequency comb generator configured to generate an optical frequency comb. Optical signals representative of the optical frequency comb pass through an optical resonator in different directions, and a rotation rate is determined based on the extent of interference between the optical signals. Parameters of the optical frequency comb generator can be controlled by a control servo based on an intensity of the optical signals after propagating in the optical resonator. Utilizing an optical frequency comb generator reduces the bias error during gyroscope operation.

The invention relates to a multi-frequency rotation modulation optical gyroscope angle measurement system which comprises a base, a rotating mechanism, a micro-motion mechanism, an optical gyroscope and a signal processing unit, and the optical gyroscope is installed on the end face of the rotating mechanism in an inclined mode; the rotating mechanism is used for driving the optical gyroscope to rotate around the Z axis relative to the base, the micro-motion mechanism is used for driving the optical gyroscope to generate high-frequency angular vibration in the rotating direction, and the signal processing unit collects gyroscope output pulses in real time and carries out signal processing to complete angular rate demodulation separation and error correction calculation; by means of the innovative combined installation mode of the single-axis optical gyroscope, the rotating mechanism and the micro-motion mechanism and the processing of the signal processing unit, separation and decoupling of space three-axis angular rate measurement signals are achieved through the single-axis optical gyroscope, the number of optical gyroscope sensors is reduced from three to one, the system cost, the size and the power consumption are all greatly reduced, and the system reliability is improved. And spatial triaxial angular rate calculation and synchronous suppression of two axial drift errors can be realized.

The application provides a kind of optical gyro cold and hot start temperature error compensation model selection and switching method, and the temperature space gradient between different positions of gyro at the moment of starting inertial navigation is obtained by multiple temperature sensors arranged in the gyro instrument area of inertial navigation.The "cold start" and "hot start" of inertial navigation are regarded as two groups, and the "Mahalanobis distance" of the sample set formed by the space gradient to the two groups is calculated.The application can judge the temperature state of the inertial navigation in a very short time after starting, and select the correct error model to compensate the gyro output, and at the same time, it can complete the compensation model transition switching of the gyro from the cold start stage to the hot state long time stable working stage, and is compatible with the different working states of cold start and hot start.The method has small calculation amount, is simple and easy to implement, and is convenient for engineering implementation.

Techniques are provided for diminishing bias error, in a resonator optical gyroscope, due to an undesired, parasitic optical mode which is orthogonal to a desired optical mode. Energy levels of the undesired, parasitic mode can be diminished utilizing polarizing beam splitters each of which suppresses energy of the undesired, parasitic mode of a clockwise or a counterclockwise optical signal more than energy of the desired mode of the CW optical signal. Optionally, one or more components of a travelling wave resonator system are configured to suppress energy of the undesired, parasitic mode of a clockwise and / or a counterclockwise optical signal more than energy of the desired mode of the respective optical signal(s). Optionally, the desired optical mode is either a transverse magnetic (TM) mode or a transverse electric (TE) mode, and the undesired, parasitic optical mode is respectively the TE mode or the TM mode.

Photonic devices and methods for operation thereof are disclosed. A photonic device may include a laser configured to generate light. The photonic device may also include a weak value device having a ring resonator. The weak value device may receive the light from the laser and modify the light using the ring resonator to form return light. The photonic device may further include a stabilizing structure configured to generate a tuning signal based on the return light and control one or both of the laser or the ring resonator using the tuning signal to lock a frequency of the laser to a resonance frequency of the ring resonator.

This application provides an angular velocity detection system and method based on weak measurement, which can be applied to the fields of quantum sensing technology and optical gyroscope technology. The system includes: a laser emitting initial light; a pre-selection module adjusting the phase of two parts of the initial light; a first optical resonant cavity transmitting the first path light along a counterclockwise path; a second optical resonant cavity transmitting the second path light along a clockwise path; a post-selection module coupling the first path light and the first part of the second path light to obtain a first interference light; a detection module detecting the first interference light to obtain a first light intensity; a processor obtaining a linear coefficient based on a predetermined phase, the initial light intensity of the initial light, and a transmission coefficient; and obtaining the rotational angular velocity based on the first light intensity, the linear coefficient, and the predetermined phase. This system uses an optical microcavity as the sensitive unit of the gyroscope, enhancing the sensing performance of the integrated optical gyroscope through weak measurement technology and improving the detection accuracy of the rotational angular velocity.

This invention proposes an integrated modulation closed-loop control system and method for a broadband light source-driven resonant fiber optic gyroscope, belonging to the field of optical gyroscope closed-loop control technology. The system includes an ASE broadband light source, a circulator, a Y-waveguide, a first coupler, a second coupler, a fiber optic ring resonant cavity, a photodetector, a digital signal generation module, a phase-locked demodulation module, a digital servo controller, and a low-pass filter module. Phase modulation and feedback control are simultaneously achieved using a single bipolar sawtooth waveform. Closed-loop compensation for rotation-induced resonant frequency shift is achieved by adjusting the phase steps corresponding to the forward and reverse slopes, eliminating the need for an additional independent feedback modulation channel. The inherent synchronization relationship between modulation and demodulation under a unified architecture reduces short-time noise and improves system stability. This invention simplifies the closed-loop control structure of broadband light source-driven resonant fiber optic gyroscopes, expands the dynamic measurement range, and improves linearity and long-term operational stability.

The invention discloses an integrated optical gyroscope and a preparation method thereof, an optical signal enters a chip through an end face coupler, passes through a beam splitter, enters a lithium niobate modulation area through a vertical adiabatic coupler for optical signal modulation, and enters a waveguide ring through a mode conversion structure after optical modulation; and the mode conversion structures are arranged at the inlet and the outlet of the waveguide ring and are used for converting modes, so that light is transmitted for multiple times in the waveguide ring. By adopting a heterogeneous integrated structure, the modulation speed and loss of the optical gyroscope are reduced, meanwhile, the waveguide ring is utilized for multiple times by adopting mode conversion, the effective length of the waveguide ring on a gyroscope chip is increased through different modes, and the sensitivity of the gyroscope is improved.

The invention provides a noise separation device and method based on a wide-spectrum resonant optical gyroscope, and the device comprises a wide-spectrum light source, an adjustable optical attenuator, a circulator, a Y-branch modulator, a photoelectric detector, an annular resonant cavity, and a data collector. The wide-spectrum light source is used for outputting wide-spectrum light; the adjustable optical attenuator is connected with the broadband light source; the adjustable optical attenuator is used for adjusting the output optical power of the broadband light source; the circulator is respectively connected with the adjustable optical attenuator, the Y-branch modulator and the photoelectric detector; the multi-Y-branch modulator is connected with the annular resonant cavity; after the wide-spectrum light sequentially passes through the adjustable optical attenuator and the circulator, initial wide-spectrum light is obtained; the initial wide-spectrum light is incident to the Y-branch modulator; the Y-branch modulator divides the initial wide-spectrum light into two beams to obtain first split light and second split light.