CN110470292B - Self-injection frequency-locking resonant optical gyroscope and working method thereof - Google Patents
Self-injection frequency-locking resonant optical gyroscope and working method thereof Download PDFInfo
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- CN110470292B CN110470292B CN201910814451.1A CN201910814451A CN110470292B CN 110470292 B CN110470292 B CN 110470292B CN 201910814451 A CN201910814451 A CN 201910814451A CN 110470292 B CN110470292 B CN 110470292B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
- G01C19/721—Details
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention belongs to the technical field of optical gyroscopes, and particularly relates to a self-injection frequency-locking resonant optical gyroscope and a working method thereof. The device consists of a working light source, a resonant light path, a photoelectric detector and a difference frequency signal detection circuit, wherein the resonant light path consists of a circulator, an isolator, a first beam splitting coupler, an incident coupler, a transmission type passive ring resonator, an emergent coupler, a second beam splitting coupler and a beam combining coupler, a second port of the circulator is connected with an input end of the isolator, and an output end of the isolator is connected with an input end of the first beam splitting coupler; the working light source of the invention adopts an FPLD light source, which reduces the volume of the resonant optical gyroscope. The invention does not need a light path feedback system participated by a modulation-demodulation circuit, only needs to lock the frequency of the laser by utilizing the clockwise light wave frequency of the resonant cavity, and simplifies the structure and the measuring method of the resonant optical gyroscope by measuring the rotation angular velocity by measuring the light wave frequency difference in the clockwise and anticlockwise transmission directions.
Description
Technical Field
The invention belongs to the technical field of optical gyroscopes, and particularly relates to a self-injection frequency-locking resonant optical gyroscope and a working method thereof.
Background
The gyroscope is a sensor for measuring the angular velocity of rotation and the angular velocity of attitude of a carrier relative to an inertial space, and belongs to a key device in systems such as inertial guidance and navigation. As an angular motion detection device, the device can be combined with an accelerometer, and can calculate the gesture of a detected object and position and navigate under the condition of no information exchange and reference with the outside, thus having wide application in various fields such as aerospace, navigation guidance and the like.
The resonant optical gyro measures the rotation angular velocity by detecting the resonance frequency difference of the clockwise and anticlockwise loops of the fiber resonant cavity. Compared with an interference type optical fiber gyro, the resonant type optical gyro enables laser to circulate in the resonant cavity, so that physical effects of the resonant type optical gyro are enhanced. According to the materials constituting the resonant cavity, the resonant optical gyro is divided into a resonant fiber optic gyro and a resonant micro-optical gyro. In general, a resonant fiber optic gyroscope uses a fiber ring resonator of several meters to several tens of meters as a core member, where the length can achieve the detection accuracy of an interferometric fiber optic gyroscope with a ring length of 1 km.
The existing resonant optical gyroscope adopts a modulation-demodulation method to realize the frequency locking of a laser and detect the resonant frequency in a ring resonant cavity. In the method, as shown in the figure, the laser is a tunable narrow linewidth laser, light output by the laser is divided into two parts by the coupler, the two parts are respectively transmitted along the clockwise direction and the anticlockwise direction of the resonant cavity after being modulated by the signals, light waves of a clockwise loop are converted into electric signals by the photoelectric detector, the electric signals are demodulated by the phase-locked amplifier to be used as feedback signals, the feedback signals are output by the feedback module to the laser, so that the output frequency of the laser is locked on the resonant frequency of the clockwise loop, and light waves of an anticlockwise loop are converted into electric signals by the photoelectric detector and are demodulated by the phase-locked amplifier to be used as output signals of the resonant gyroscope. Therefore, the structure and the working method of the existing resonant optical gyroscope are complex.
In the prior art, a resonant optical gyroscope which ensures that the output laser frequency of a laser tracks the resonant frequency in a self-injection locking mode is also disclosed in an invention patent named as a self-injection locking resonant optical gyroscope and a working method thereof, such as application number CN 107843248A. The scheme adopts two working light sources to share a passive ring resonant cavity. Light emitted by the two working light sources resonates in the same passive annular resonant cavity along opposite directions, two beams of resonant light emitted from different directions are respectively split by a beam splitting coupler, one end of the resonant light is transmitted back to the laser to stabilize the frequency by a self-injection method, and the other end of the resonant light is coupled and input to the photoelectric detector by using a beam combining coupler, so that the detection of a gyro signal is realized. However, this scheme uses two LD light sources, and frequency locking is achieved using self-injection, and it is difficult to overcome errors caused by different frequency drift of each laser.
Disclosure of Invention
The invention aims to simplify the structure and the working method of a resonant optical gyroscope, reduce the volume of the resonant optical gyroscope and avoid measurement errors caused by different frequency drift amounts of multiple light sources.
The self-injection frequency-locking resonant optical gyroscope consists of a working light source 1, a resonant light path, a photoelectric detector 10 and a difference frequency signal detection circuit 11, wherein the resonant light path consists of a circulator 2, an isolator 3, a first beam splitting coupler 4, an incident coupler 5, a transmission type passive ring resonator 6, an emergent coupler 7, a second beam splitting coupler 8 and a beam combining coupler 9, a second port of the circulator 2 is connected with an input end of the isolator 3, an output end of the isolator 3 is connected with an input end of the first beam splitting coupler 4, two output ends of the first beam splitting coupler 4 are respectively connected with two input ends of the incident coupler 5, two output ends of the incident coupler 5 are respectively connected with two input ends of the transmission type passive ring resonator 6, two output ends of the transmission type passive ring resonator 6 are respectively connected with two input ends of the emergent coupler 7, a first output end of the emergent coupler 7 is connected with a first input end of the beam combining coupler 9, a second output end of the emergent coupler 7 is connected with a second input end of the second beam splitting coupler 8, and a second output end of the second beam splitting coupler 8 is connected with a second input end of the second beam combining coupler 8; the working light source 1 is connected with a first port of the circulator 2 through an optical fiber, the output end of the beam combining coupler 9 is optically connected with the photoelectric detector 10, and the photoelectric detector 10 is electrically connected with the difference frequency signal detection circuit 11.
The circulator 2 is a three-port optical fiber clockwise circulator.
The working light source 1, the circulator 2, the isolator 3, the first beam splitting coupler 4, the incident coupler 5, the transmission type passive ring resonator 6, the emergent coupler 7, the second beam splitting coupler 8 and the beam combining coupler 9 are all elements with polarization maintaining characteristics, and the working light source 1, the circulator 2, the isolator 3, the first beam splitting coupler 4, the incident coupler 5, the transmission type passive ring resonator 6, the emergent coupler 7, the second beam splitting coupler 8, the beam combining coupler 9 and the photoelectric detector 10 have the same working wavelength.
The working light source 1 is in a mode of equally-spaced multi-longitudinal-mode output light waves.
A working method of a self-injection frequency-locking resonant optical gyroscope comprises the following steps:
(1) A frequency-selecting and frequency-locking loop;
(2) The measuring loop is coupled out.
The frequency-selecting and frequency-locking loop comprises:
the working light source is connected to a first port of the circulator through an optical fiber, a second port of the circulator is connected to an input end of a first beam splitting coupler through an isolator for splitting beams, two output ends of the first beam splitting coupler are respectively connected with two input ends of an incident coupler, two output ends of the incident coupler are respectively connected with two input ends of a transmission type passive annular resonant cavity, two output ends of the transmission type passive annular resonant cavity are respectively connected with two input ends of an emergent coupler, a first output end of the emergent coupler is connected with a first input end of a beam combining coupler, a second output end of the emergent coupler is connected with an input end of a second beam splitting coupler, a first output end of the second beam splitting coupler is connected with a second input end of the beam combining coupler, and a second output end of the second beam splitting coupler is connected with a third port of the circulator, so that clockwise transmitted light waves can be returned to an inner cavity of the working light source for self injection, and single-mode longitudinal frequency locking of the laser light source is completed.
The coupling-out measurement loop comprises:
the light emitted by the working light source is input to a first port of the circulator, a second port of the circulator is connected to an input end of a first beam splitting coupler through an isolator for splitting beams, two output ends of the first beam splitting coupler are respectively connected with two input ends of an incident coupler, two output ends of the incident coupler are respectively connected with two input ends of a transmission type passive annular resonant cavity, two light waves are respectively transmitted in the resonant cavity along clockwise and anticlockwise directions, two output ends of the transmission type passive annular resonant cavity are respectively connected with two input ends of an emergent coupler, the first output end of the emergent coupler is connected with the first input end of a beam combining coupler, the second output end of the emergent coupler is connected with the input end of the second beam combining coupler, the first output end of the second beam combining coupler is connected with the second input end of the beam combining coupler, the partial light waves and the other light waves pass through the beam combining coupler to form frequency signals, the output ends of the beam combining coupler are connected to the input ends of the detector, the detector converts the input optical signals of the electric signals into the electric signals, the difference frequency signals are detected to be the rotation angle signals, and the rotation angle frequency difference is calculated according to the rotation angle difference, and the rotation angle difference frequency is detected, and the rotation angle difference frequency is calculated.
The invention has the beneficial effects that:
the working light source of the invention adopts an FPLD light source, which reduces the volume of the resonant optical gyroscope. Compared with the existing resonant optical gyroscope, the resonant optical gyroscope does not need an optical path feedback system participated by a modulation and demodulation circuit, only needs to lock the frequency of the laser by utilizing the clockwise optical wave frequency of the resonant cavity, and the rotation angular velocity is measured by measuring the optical wave frequency difference in the clockwise and anticlockwise transmission directions, so that the structure and the measuring method of the resonant optical gyroscope are simplified.
Drawings
FIG. 1 is a schematic diagram of a self-injection frequency-locked resonant optical gyroscope and a method of operating the same.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
In fig. 1: the device comprises a 1-working light source, a 2-resonant light path, a circulator, a 3-isolator, a 4-first beam splitting coupler, a 5-incident coupler, a 6-transmission type passive ring resonator, a 7-emergent coupler, an 8-second beam splitting coupler, a 9-beam combining coupler, a 10-photoelectric detector and an 11-difference frequency signal detection circuit.
The invention aims to simplify the structure and the working method of a resonant optical gyroscope, reduce the volume of the resonant optical gyroscope and avoid measurement errors caused by different frequency drift amounts of multiple light sources.
The resonant optical gyro measures the rotation angular velocity by detecting the resonance frequency difference of the clockwise and anticlockwise loops of the fiber resonant cavity. The invention discloses a self-injection frequency-locking resonant optical gyroscope and a working method thereof. The optical path part of the invention is composed of conventional circuit elements in the technical field of optical fibers, and comprises a circulator, an isolator, a coupler, a resonant cavity and the like, and the circuit part is composed of a photoelectric detector and a difference frequency detection circuit. The frequency is locked by a self-injection mode, so that the structure, the volume and the working mode of the resonant optical gyroscope are simplified.
1. A self-injection frequency-locked resonant optical gyro, a working light source (FPLD) is connected to one port 1 of a circulator (Cir) by an optical fiber; the circulator (Cir) is a clockwise circulator, the circulator (Cir), the beam splitting coupler (OC 1), the incident coupler (OC 2), the transmission type passive ring resonant cavity (FRR), the emergent coupler (OC 3), the beam splitting coupler (OC 4) and the beam combining coupler (OC 5) are sequentially connected to form a resonant optical path of the resonant optical gyroscope, wherein the next port 2 of the circulator (Cir) is connected with the input port 1 of the beam splitting coupler (OC 2).
The two ports 2 and 3 output by the beam splitting coupler (OC 1) are connected with the two incident ports 1 and 2 on two sides of the incident coupler (OC 2), the two output ports 3 and 4 of the incident coupler are connected with the input port of the ring resonator (FRR), the output port of the ring resonator (FRR) is connected with the input ports 3 and 4 of the emergent coupler (OC 3), the emergent port 1 of the emergent coupler (OC 3) is connected with the input port 2 of the beam splitting coupler (OC 5), the emergent port 2 of the emergent coupler (OC 3) is connected with the input port 1 of the beam splitting coupler (OC 4), the output port 2 of the beam splitting coupler (OC 4) is connected with the input port 3 of the beam splitting coupler (OC 5), and the output port 3 of the beam splitting coupler (OC 4) is connected with the port 3 of the ring; an Isolator (ISO) is added to the resonant optical path of the circulator (Cir) and the split coupler (OC 1). The beam combining coupler (OC 5) is optically connected with a Photoelectric Detector (PD), and the photoelectric detector is electrically connected with a difference frequency signal detection circuit (EC).
The working light source 1, the circulator 2, the isolator 3, the first beam splitting coupler 4, the incident coupler 5, the transmission type passive ring resonator 6, the emergent coupler 7, the second beam splitting coupler 8 and the beam combining coupler 9 are all elements with polarization maintaining characteristics, and the working light source 1, the circulator 2, the isolator 3, the first beam splitting coupler 4, the incident coupler 5, the transmission type passive ring resonator 6, the emergent coupler 7, the second beam splitting coupler 8, the beam combining coupler 9 and the photoelectric detector 10 have the same working wavelength.
The working light source (FPLD) is in a mode of equally-spaced multi-longitudinal-mode output light waves.
The circulator (Cir) is a three-port fiber circulator.
A self-injection frequency-locking resonant optical gyroscope working method comprises the following steps:
first, the frequency-selecting and frequency-locking loop: the working light source (FPLD) is connected to a port 1 of a circulator (Cir) through an optical fiber, the circulator (Cir) is a clockwise circulator, a port 2 of the circulator (Cir) is connected to a port 1 of a beam splitting coupler (OC 1) through an Isolator (ISO), one emergent port 2 of the beam splitting coupler (OC 1) is connected to an input end 1 of an incident coupler (OC 2), the other emergent port 3 is connected to an input end 2 of the incident coupler (OC 2), two output ends 3 and 4 of the incident coupler (OC 2) are connected to a passive resonant cavity (FRR), the input ends 3 and 4 of the emergent coupler (OC 3) are also connected to the passive resonant cavity (FRR), the output end 1 of the emergent coupler (OC 3) is connected to an input end 2 of a beam combining coupler (OC 5), the output end 2 of the emergent coupler (OC 3) is connected to the input end 1 of the beam splitting coupler (OC 4), the output end 2 of the beam splitting coupler (OC 4) is connected to the input end 2 of the beam combining coupler (OC 5), and the laser light wave can be transmitted from the cavity (FPLD) in a single mode, and the working light source (FPLD) can be fed back to the cavity (FPLD) through the cavity.
Secondly, the coupling-out measurement loop: light emitted by the working light source (FPLD) is input to a port 1 of the circulator (Cir), then output to the Isolator (ISO) through a port 2 of the circulator (Cir) and then input to a port 1 of the beam splitting coupler (OC 1), the split light is input to input ports 1 and 2 of the incident coupler (OC 2) through incident ports 2 and 3 of the beam splitting coupler (OC 1), then transmitted to the passive resonant cavity (FRR) through output ends 3 and 4 of the incident coupler (OC 2), and the two light waves are respectively transmitted in the resonant cavity (FRR) in clockwise and anticlockwise directions and then input to input ends 3 and 4 of the emergent coupler (OC 3), and the output end 1 of the emergent coupler (OC 3) is connected to the input end 2 of the beam combining coupler (OC 5). The output end 2 of the emergent coupler (OC 3) is connected to the input end 1 of the beam splitting coupler (OC 4), the light wave input to the beam splitting coupler (OC 4) is input to the input end 3 of the beam combining coupler (OC 5) from the output end 2, the light wave and the light wave of the other beam passing through the beam combining coupler (OC 5) are overlapped to form beat frequency signals, the output end 1 of the beam combining coupler (OC 5) is connected to the input end of the Photoelectric Detector (PD), the Photoelectric Detector (PD) converts the input light signals into electric signals, the electric signals are input to the difference frequency signal detection circuit (EC), the difference frequency signal detection circuit (EC) is used for calculating the frequency difference of the light waves in two directions, and the measurement of the rotation angle speed is completed according to the proportional relation between the frequency difference and the rotation angle speed of the gyroscope.
According to the self-injection frequency-locking resonant optical gyroscope structure disclosed by the invention, as shown in the figure, light waves emitted by a light source FPLD pass through a circulator Cir and an isolator ISO, and are divided into two parts with the same intensity by a beam splitting coupler OC1, and the two light waves output by the beam splitter are respectively transmitted in a resonant cavity FRR along the clockwise direction and the anticlockwise direction from the output end of a resonant cavity incidence coupler OC 2. Due to the Sagnac effect, light waves in the clockwise direction and the anticlockwise direction generate a certain frequency difference and are emitted from two output ends of the emergent coupler OC3, wherein the light waves in the anticlockwise direction directly enter the beam combining coupler OC5, the light waves in the clockwise direction enter the beam splitting coupler OC4 and are divided into two parts, one part of the light waves are transmitted to the circulator Cir, so that the part of the light waves in the clockwise direction are injected into the inner cavity of the return light source FPLD, the other part of the light waves are transmitted to the beam combining coupler OC5, and the light waves in the anticlockwise direction are coupled into a difference frequency signal. The optical path portion outputs a difference frequency signal which is converted into an electric signal by the photodetector PD, and the electric signal is input to the difference frequency signal detection circuit EC.
The working wavelength of the working light source, the circulator, the coupler, the isolator, the resonant cavity, the photoelectric detector and the optical fiber is 1550nm. The spectrum width of the working light source FPLD is 1nm, and the power is more than 10mW. The resonant cavity FRR is a single-mode polarization maintaining fiber ring with the length of 14m and the diameter of 10 cm. The coupling ratio for the split coupler OC1 is 50:50, the intensity through coefficient is 0.5, the intensity bypass coefficient is 0.5, the incident coupler OC2 and the emergent coupler OC3 are all 2X 2 single mode fiber couplers, and the coupling ratio is 4:96, an intensity through coefficient of 0.96, an intensity bypass coupling coefficient of 0.04, and a coupling ratio of the beam combining coupler OC5 of 50:50. an isolator is disposed between the light source and the beam splitting coupler. The isolator is a two-stage optical fiber isolator, and the isolation degree is more than 28dB. The photoelectric detector is a PIN photoelectric detector with an optical fiber tail fiber.
The isolator ISO functions to prevent back-scattered noise from being injected into the light source.
The working method of the self-injection frequency-locking resonant optical gyroscope is shown in the figure.
Claims (3)
1. The utility model provides a self-injection locking frequency resonance type optical gyroscope, comprises working light source (1), resonant light path, photoelectric detector (10), difference frequency signal detection circuit (11), its characterized in that: the resonant optical path consists of a circulator (2), an isolator (3), a first beam splitting coupler (4), an incident coupler (5), a transmission type passive annular resonant cavity (6), an emergent coupler (7), a second beam splitting coupler (8) and a beam combining coupler (9), wherein a second port of the circulator (2) is connected with an input end of the isolator (3), an output end of the isolator (3) is connected with an input end of the first beam splitting coupler (4), two output ends of the first beam splitting coupler (4) are respectively connected with two input ends of the incident coupler (5), two output ends of the incident coupler (5) are respectively connected with two input ends of the transmission type passive annular resonant cavity (6), two output ends of the transmission type passive annular resonant cavity (6) are respectively connected with two input ends of the emergent coupler (7), a first output end of the emergent coupler (7) is connected with a first input end of the beam combining coupler (9), and a second output end of the emergent coupler (7) is connected with a second input end of the second beam splitting coupler (8), and two output ends of the second beam splitting coupler (8) are connected with a second output end of the second beam combining coupler (8); the working light source (1) is connected with a first port of the circulator (2) through an optical fiber, the output end of the beam combining coupler (9) is optically connected with the photoelectric detector (10), and the photoelectric detector (10) is electrically connected with the difference frequency signal detection circuit (11);
the circulator (2) is a three-port optical fiber clockwise circulator;
the working light source (1), the circulator (2), the isolator (3), the first beam splitting coupler (4), the incident coupler (5), the transmission type passive annular resonant cavity (6), the emergent coupler (7), the second beam splitting coupler (8) and the beam combining coupler (9) are elements with polarization maintaining characteristics, and working wavelengths of the working light source (1), the circulator (2), the isolator (3), the first beam splitting coupler (4), the incident coupler (5), the transmission type passive annular resonant cavity (6), the emergent coupler (7), the second beam splitting coupler (8), the beam combining coupler (9) and the photoelectric detector (10) are identical.
2. A self-injection frequency-locked resonant optical gyroscope according to claim 1, characterized in that the mode of the working light source (1) is an equidistant multiple longitudinal mode output light wave.
3. The method of operating a self-injection frequency-locked resonant optical gyroscope according to claim 1 or 2, comprising the steps of:
(1) A frequency-selecting and frequency-locking loop;
(2) Coupling out a measurement loop;
the frequency-selecting and frequency-locking loop comprises:
the working light source is connected to a first port of the circulator through an optical fiber, a second port of the circulator is connected to an input end of a first beam splitting coupler through an isolator for splitting beams, two output ends of the first beam splitting coupler are respectively connected with two input ends of an incident coupler, two output ends of the incident coupler are respectively connected with two input ends of a transmission type passive annular resonant cavity, two output ends of the transmission type passive annular resonant cavity are respectively connected with two input ends of an emergent coupler, a first output end of the emergent coupler is connected with a first input end of a beam combining coupler, a second output end of the emergent coupler is connected with an input end of a second beam splitting coupler, a first output end of the second beam splitting coupler is connected with a second input end of the beam combining coupler, and a second output end of the second beam splitting coupler is connected with a third port of the circulator, so that clockwise transmitted parts can return to an inner cavity of the working light source for self injection, and single-mode longitudinal frequency locking of the laser light source is completed;
the coupling-out measurement loop comprises:
the light emitted by the working light source is input to a first port of the circulator, a second port of the circulator is connected to an input end of a first beam splitting coupler through an isolator for splitting beams, two output ends of the first beam splitting coupler are respectively connected with two input ends of an incident coupler, two output ends of the incident coupler are respectively connected with two input ends of a transmission type passive annular resonant cavity, two light waves are respectively transmitted in the resonant cavity along clockwise and anticlockwise directions, two output ends of the transmission type passive annular resonant cavity are respectively connected with two input ends of an emergent coupler, the first output end of the emergent coupler is connected with the first input end of a beam combining coupler, the second output end of the emergent coupler is connected with the input end of the second beam combining coupler, the first output end of the second beam combining coupler is connected with the second input end of the beam combining coupler, the partial light waves and the other light waves pass through the beam combining coupler to form frequency signals, the output ends of the beam combining coupler are connected to the input ends of the detector, the detector converts the input optical signals of the electric signals into the electric signals, the difference frequency signals are detected to be the rotation angle signals, and the rotation angle frequency difference is calculated according to the rotation angle difference, and the rotation angle difference frequency is detected, and the rotation angle difference frequency is calculated.
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| CN112113556B (en) * | 2020-08-28 | 2022-06-24 | 哈尔滨工程大学 | High-sensitivity resonant micro-optical gyroscope based on self-injection frequency locking and detection method thereof |
| CN112066969B (en) * | 2020-10-15 | 2021-08-13 | 中北大学 | Double-light self-injection locking resonant micro-opto-electro-mechanical gyroscope based on optical phase-locked loop |
| CN113310480B (en) * | 2021-05-19 | 2023-03-21 | 北京航空航天大学 | Optical gyroscope system based on silicon nitride waveguide resonant cavity |
| CN114459458B (en) * | 2022-02-24 | 2023-11-17 | 东南大学 | Optical gyroscope based on double-helix four-port micro-nano optical fiber resonant cavity |
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| CN102519445A (en) * | 2011-12-07 | 2012-06-27 | 浙江大学 | Resonance optic gyro based on digital phase oblique wave frequency shift technology |
| CN105356294A (en) * | 2015-11-10 | 2016-02-24 | 中国科学院上海光学精密机械研究所 | Tunable narrow linewidth semiconductor laser |
| CN107843248A (en) * | 2017-09-01 | 2018-03-27 | 长春理工大学 | Self-injection locking resonance type optical gyroscope and its method of work |
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