CN117029801A - Relative intensity noise suppression device for optical fiber gyroscope and optical fiber gyroscope - Google Patents
Relative intensity noise suppression device for optical fiber gyroscope and optical fiber gyroscope Download PDFInfo
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- CN117029801A CN117029801A CN202311034597.7A CN202311034597A CN117029801A CN 117029801 A CN117029801 A CN 117029801A CN 202311034597 A CN202311034597 A CN 202311034597A CN 117029801 A CN117029801 A CN 117029801A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 109
- 230000001629 suppression Effects 0.000 title claims abstract description 44
- 239000000835 fiber Substances 0.000 claims description 45
- 230000010287 polarization Effects 0.000 claims description 10
- 229910052691 Erbium Inorganic materials 0.000 claims description 7
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 4
- 230000002269 spontaneous effect Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 description 16
- 238000000034 method Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 230000003595 spectral effect Effects 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- DTSCLFDGIVWOGR-UHFFFAOYSA-N 1,3-dimethyl-5h-pyrido[2,3]pyrrolo[2,4-b]pyrimidine-2,4-dione Chemical compound C12=NC=CC=C2NC2=C1N(C)C(=O)N(C)C2=O DTSCLFDGIVWOGR-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
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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
Abstract
Provided are a relative intensity noise suppression device for an optical fiber gyro and an optical fiber gyro. The relative intensity noise suppression device comprises an ASE light source, a first optical fiber collimator, a polarizer, a spectroscope, a Faraday rotator, a second optical fiber collimator and a single detector. The first optical fiber collimator, the polarizer, the spectroscope and the second optical fiber collimator are sequentially arranged at intervals along the first direction. The Faraday rotator, the spectroscope and the detector are sequentially arranged at intervals along a second direction, and the second direction is perpendicular to the first direction. The space light path structure composed of the first optical fiber collimator, the polarizer, the spectroscope, the Faraday rotator, the second optical fiber collimator and the single detector is adopted, and each component in the space light path structure does not need to be connected by optical fibers so as to greatly reduce the wiring space occupied by the optical fibers, thereby being convenient for the size miniaturization of the space light path structure and reducing the production cost.
Description
Technical Field
The present disclosure relates to the field of fiber optic gyroscopes, and more particularly to a relative intensity noise suppression device for a fiber optic gyroscope and a fiber optic gyroscope.
Background
The high-precision fiber optic gyroscope adopts an erbium-doped fiber optic light source based on Amplified Spontaneous Emission (ASE), has the advantages of high output power, good wavelength stability, low coherence, long service life and the like, but the relatively high optical power causes the noise (RIN) of the light source to become a main noise source affecting the accuracy of the gyroscope, which restricts the performance and the application of the high-precision fiber optic gyroscope. The method for increasing the modulation depth is the most common method, the inhibition effect of the method in the high-precision fiber-optic gyroscope is very limited, and the modulation depth is large, so that the dynamic range, the impact and the thermal stability of the fiber-optic gyroscope can be influenced, and the method can only be used as an auxiliary means for inhibiting RIN.
The RIN suppression method adopted for the high-precision fiber-optic gyroscope at present is mainly divided into two methods of noise suppression at a light source and circuit noise subtraction. (1) Since the size of RIN is inversely proportional to the spectral width of the light source, increasing the spectral width of the light source can directly reduce RIN, but too large a spectral width can have an effect on the stability of the light source. An effective method is to add a Semiconductor Optical Amplifier (SOA) after the light source, and to implement RIN suppression by using nonlinear amplification of the SOA. However, when the light wave passes through the SOA, the output wavelength, power stability, spectrum shape and the like are affected, and the SOA is severely affected by temperature, so that the degradation of scale factors is caused, and the reliability and stability of the fiber-optic gyroscope are greatly affected; (2) The circuit noise subtraction is to connect the idle end of the optical path and the coupler to one polarizer to make the reference light of the idle end and the signal light with Sagnac effect have the same polarization state, and the RIN characteristic and distribution of the two light after the light passes through the same optical fiber delay are identical, and to convert the two light into electric signal to subtract, so as to remove the RIN of the light source. However, this method requires that the polarization state, phase, amplitude, etc. parameters of the reference light and the signal light are required to be kept highly consistent, two detectors are required, a new electronic circuit board is built, an appropriate digital filter is required to be developed, and the method is complex and has high cost, and cannot be made small in size.
The invention of China patent application publication No. CN109724583A published in 5 and 7 of 2019 discloses a FRM-based light source relative intensity noise cancellation structure, which is provided with a polarization maintaining coupler, four connecting ends of the polarization maintaining coupler are connected with an ASE light source, a Y waveguide integrated optical device, a Faraday rotating mirror and a detector through optical fibers, so that signal light and reference light are completely transmitted in the optical fibers, and because the manufacturing and installation cost of the optical fibers are high, and more space is required for wiring, the production cost is increased, and the miniaturization of the structural size of the relative intensity noise cancellation structure is difficult to realize.
Disclosure of Invention
In view of the problems in the prior art, an object of the present disclosure is to provide a relative intensity noise suppression device for an optical fiber gyroscope, in which each component in a spatial light path structure does not need to be connected by an optical fiber to greatly reduce the wiring space occupied by the optical fiber, so that the size of the spatial light path structure is convenient to be miniaturized, and the structural size of the relative intensity noise suppression device can be miniaturized, and meanwhile, the production cost is reduced because the optical fiber connection is not needed.
Thus, a relative intensity noise suppression device for a fiber optic gyroscope is provided, the relative intensity noise suppression device comprising an ASE light source, a first fiber optic collimator, a polarizer, a spectroscope, a Faraday rotator, a second fiber optic collimator, and a single detector. The first optical fiber collimator, the polarizer, the spectroscope and the second optical fiber collimator are sequentially arranged at intervals along the first direction. The Faraday rotator, the spectroscope and the detector are sequentially arranged at intervals along a second direction, and the second direction is perpendicular to the first direction. The ASE light source is used to emit an amplified light beam of spontaneous emission. The first optical fiber collimator is used for receiving light emitted by the ASE light source and converting the received light from the ASE light source into parallel light. The polarizer is used for receiving the parallel light transmitted by the first optical fiber collimator and converting the received parallel light into linearly polarized light. The light splitter is used for receiving the linearly polarized light of the polarizer at an angle of 45 degrees to split the linearly polarized light into two reflected light beams with equal power in the second direction and transmitted light beams with equal power in the first direction. The Faraday rotator is used for receiving the reflected light of the spectroscope, rotating the polarization direction of the received reflected light by 90 degrees, and reflecting the reflected light of the spectroscope rotated by 90 degrees back into the spectroscope along the second direction as reference light. The second optical fiber collimator is used for connecting an external Y waveguide and an optical fiber sensitive ring, the Y waveguide is used for receiving the transmitted light of the second optical fiber collimator, dividing the transmitted light into two branches and supplying the two branches to the optical fiber sensitive ring and modulating and demodulating signals from the optical fiber sensitive ring, the optical fiber sensitive ring is used for at least containing sensing information for detecting angular velocity and returning signal light containing the sensing information to the Y waveguide, and the second optical fiber collimator is used for receiving the transmitted light of the spectroscope, transmitting the received transmitted light to the optical fiber sensitive ring through the Y waveguide and receiving the signal light containing the sensing information returned by the optical fiber sensitive ring through the Y waveguide. The beam splitter is also configured to transmit the reference light from the faraday rotator and reflect the signal light from the second fiber collimator toward the detector. The detector is used for receiving the reference light transmitted from the spectroscope and the signal light reflected by the spectroscope.
A fiber optic gyroscope is provided, the fiber optic gyroscope including a relative intensity noise suppression device, and a Y-waveguide and a fiber optic sensing ring. The Y waveguide is used for modulating and demodulating signals from an optical fiber sensitive ring, and the optical fiber sensitive ring is used for at least containing sensing information of the detection angular speed.
The beneficial effects of the present disclosure are as follows: compared with a light source relative intensity noise cancellation structure in the background art, an ASE light source, a Y waveguide integrated optical device, a Faraday rotating mirror and a detector are connected with a polarization maintaining coupler by adopting optical fibers, the relative intensity noise suppression device for the optical fiber gyroscope disclosed by the disclosure adopts a space optical path structure formed by a first optical fiber collimator, a polarizer, a spectroscope, the Faraday rotating mirror, a second optical fiber collimator and a single detector, wiring space occupied by the optical fibers is not required to be greatly reduced by each component in the space optical path structure by means of optical fiber connection, the size of the space optical path structure is convenient to be miniaturized, and the structural size of the relative intensity noise suppression device is further miniaturized.
Drawings
Fig. 1 is a schematic diagram of a fiber optic gyroscope according to the present disclosure.
Fig. 2 is an assembly view of a relative intensity noise suppression device according to the present disclosure.
Fig. 3 is an exploded view according to fig. 2.
Fig. 4 is a partially exploded view according to fig. 2.
Figure 5 is an assembly drawing of a first embodiment of a faraday rotator according to the present disclosure, comprising a faraday rotator and a mirror.
Figure 6 is an assembly drawing of a second embodiment of a faraday rotator according to the present disclosure, comprising a faraday rotator and a reflective film.
Wherein reference numerals are as follows:
100 relative intensity noise suppression device 6 second fiber collimator
1ASE light source 7 detector
11 first housing of pump source 8
12 erbium doped optical fiber 9 base
13 first Integrated hybrid 91 annular frame
14 second integrated hybrid 92 support plate
2 first optical fiber collimator 93 cover plate
3 polarizer 10 second housing
4 spectroscope 200 optical fiber gyro
5 Faraday rotator mirror 21Y waveguide
51 Faraday rotator 22 optical fiber sensing ring
52 mirror D1 first direction
53 reflective film D2 second direction
Detailed Description
The drawings illustrate embodiments of the present disclosure, and it is to be understood that the disclosed embodiments are merely examples of the disclosure that may be embodied in various forms and that, therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously practice the disclosure.
It is noted that in the present invention, the use of the terms "first" and "second" are merely used to denote components, and are not intended to represent interdependencies or relative importance between the components.
[ relative intensity noise suppression device for fiber-optic gyroscope ]
Referring to fig. 1 to 4, a relative intensity noise suppression device 100 for a fiber optic gyro according to the present disclosure, the relative intensity noise suppression device 100 includes an ASE light source 1, a first fiber collimator 2, a polarizer 3, a beam splitter 4, a faraday rotator 5, a second fiber collimator 6, and a single detector 7. The first fiber collimator 2, the polarizer 3, the spectroscope 4, and the second fiber collimator 6 are sequentially arranged at intervals along the first direction D1. The faraday rotator 5, the beam splitter 4 and the detector 7 are sequentially arranged at intervals along a second direction D2, and the second direction D2 is perpendicular to the first direction D1. The ASE light source 1 is used to emit an amplified light beam of spontaneous emission. The first fiber collimator 2 is for receiving light emitted from the ASE light source 1 and converting the received light from the ASE light source 1 into parallel light. The polarizer 3 is used for receiving the parallel light transmitted by the first optical fiber collimator 2 and converting the received parallel light into linearly polarized light. The beam splitter 4 has a transmittance and a reflectance of 50%, and the beam splitter 4 is configured to receive the linearly polarized light of the polarizer 3 at an angle of 45 ° to split the linearly polarized light into two reflected light beams in the second direction D2 and transmitted light beams in the first direction D1, which have equal power. The faraday rotator 5 is configured to receive the reflected light of the beam splitter 4, rotate the polarization direction of the received reflected light by 90 degrees, and reflect the reflected light of the beam splitter 4 rotated by 90 degrees back into the beam splitter 4 along the second direction D2 as reference light. The second optical fiber collimator 6 is used for connecting an external Y waveguide 21 and an optical fiber sensing ring 22, the Y waveguide 21 is used for receiving the transmitted light of the second optical fiber collimator 6, dividing the transmitted light into two branches and supplying the two branches to the optical fiber sensing ring 22 and modulating and demodulating a signal from the optical fiber sensing ring 22, the optical fiber sensing ring 22 is used for at least detecting the sensing information of the angular velocity and returning the signal light containing the sensing information to the Y waveguide 21, and the second optical fiber collimator 6 is used for receiving the transmitted light of the spectroscope 4, transmitting the received transmitted light to the optical fiber sensing ring 22 through the Y waveguide 21 and receiving the signal light containing the sensing information returned by the optical fiber sensing ring 22 through the Y waveguide 21. The beam splitter 4 is also used to transmit the reference light from the faraday rotator 5 and reflect the signal light from the second fiber collimator 6 towards the detector 7. The detector 7 is for receiving the reference light transmitted from the spectroscope 4 and the signal light reflected from the spectroscope 4.
Compared with a light source relative intensity noise cancellation structure in the background art, an ASE light source, a Y waveguide integrated optical device, a Faraday rotating mirror and a detector are connected with a polarization maintaining coupler by adopting optical fibers, and the relative intensity noise suppression device for the optical fiber gyroscope disclosed by the disclosure adopts a space optical path structure formed by a first optical fiber collimator 2, a polarizer 3, a spectroscope 4, a Faraday rotating mirror 5, a second optical fiber collimator 6 and a single detector 7, and wiring space occupied by the optical fibers is greatly reduced by each component in the space optical path structure without optical fiber connection, so that the size of the space optical path structure is convenient to miniaturize, and the structural size of the relative intensity noise suppression device is further miniaturized.
The detector 7 is used to convert the optical signal into an electrical signal.
In one example, the ASE light source 1 comprises a pump source 11, a faraday reflector, a wavelength division multiplexer, an erbium doped fiber 12, an isolator and a filter, which are connected in sequence by an optical fiber. The erbium doped fiber 12 is used to provide gain, i.e. to increase the intensity of the optical signal emitted by the ASE light source 1. The isolator is used for maintaining unidirectional transmission of light and optimizing the spectrum shape, and avoids the generation of spectrum burrs.
In an example, the first fiber collimator 2 is connected to the filter by optical fibers in the first fiber collimator 2.
In one example, referring to fig. 1, 3 and 4, the faraday reflector and the wavelength division multiplexer are integrated together to form a first integrated hybrid 13, facilitating miniaturization of the relative intensity noise suppression apparatus 100.
In one example, the isolator and filter are integrated together to form the second integrated hybrid device 14, facilitating the miniaturization of the relative intensity noise suppression apparatus 100.
In one example, pump source 11 is a 980nm pump laser. The 980nm pump laser can be a 980nm semiconductor fiber coupled output laser.
In one example, referring to fig. 1, a faraday reflector is used to totally reflect pump light back from the erbium doped fiber 12. Specifically, the faraday reflector returns the backward ASE light to the erbium-doped fiber 12 to be amplified again, thereby increasing the output power of the ASE light source 1 and reducing the coherence of the ASE light source 1.
In one example, the filter is a gaussian filter. In particular, a broadband gaussian filter, for improving the spectral shape.
In an example, referring to fig. 1, ase light source 1 adopts a co-pumping structure. Specifically, the ASE light source 1 adopts a forward pumping double-pass structure.
In the first embodiment, referring to fig. 5, the faraday rotator 5 includes a faraday rotator 51 and a mirror 52. Referring to fig. 4, in the second direction D2, a faraday rotator 51 is located between the mirror 52 and the beam splitter 4.
The reflectivity of the reflecting mirror 52 is 2%, so as to control the power of the reference light reflected back to the beam splitter, so that the power of the reference light reflected back to the beam splitter is equal to the power of the signal light reflected back to the beam splitter, and further improve the suppression effect of the relative intensity noise.
In the second embodiment, referring to fig. 6, the faraday rotator 5 includes a faraday rotator 51 and a reflective film 53. The reflective film 53 is coated on a surface of the faraday rotator 51 facing away from the beam splitter 4 in the second direction D2. The reflectivity of the reflective film 53 is 2%, so as to control the power of the reference light reflected back to the beam splitter, so that the power of the reference light reflected back to the beam splitter is equal to the power of the signal light reflected back to the beam splitter, thereby improving the suppression effect of the relative intensity noise.
In an example, referring to fig. 1, the second fiber collimator 6 is connected to an external Y waveguide 21 through an optical fiber of the second fiber collimator 6.
In an example, referring to fig. 4, the relative intensity noise suppression device 100 further includes a first housing 8 and a base 9. The first optical fiber collimator 2, the polarizer 3, the spectroscope 4, the Faraday rotator 5, the second optical fiber collimator 6, the single detector 7 and the base 9 are arranged in the first shell 8. The first fiber collimator 2 is mounted on one side of the housing 9 along the first direction D1. The polarizer 3 is mounted inside the housing 9. The beam splitter 4 is mounted inside the housing 9. The second fiber collimator 6 is mounted on the opposite side of the housing 9 from the first fiber collimator 2 in the first direction D1. The detector 7 is mounted on the opposite side of the outside of the housing 9 to the faraday rotator 5 in the second direction D2.
In an example, referring to fig. 4, the base 9 includes an annular frame 91 and a support plate 92, the support plate 92 being located inside the annular frame 91 and connected to the annular frame 91. The first fiber collimator 2, the polarizer 3, the second fiber collimator 6 and the detector 7 are mounted to the annular frame 91. The faraday rotator 5 and the beam splitter 4 are mounted on a support plate 92. The housing 9 further comprises a cover plate 93 for sealing the support plate 92 within the annular frame 91, which serves to limit and protect the first fiber collimator 2, the polarizer 3, the second fiber collimator 6 and the detector 7 of the housing 9 from external impacts or other devices of the first housing 8 from light beam signal propagation or noise interference in the spatial light path.
In an example, referring to fig. 2 and 3, the relative intensity noise suppression device 100 further includes a second housing 10. The second housing 10 and the first housing 8 can be detachably assembled together. The pump source 11 of the ASE light source 1 is provided in the second housing 10. The faraday reflector, wavelength division multiplexer, erbium doped fiber 12, isolator and filter are wound around the annular frame 91, facilitating downsizing of the relative intensity noise suppression device 100.
During debugging, referring to fig. 2 and 3, the first optical fiber collimator 2, the polarizer 3, the spectroscope 4, the faraday rotator 5 and the second optical fiber collimator 6 are installed inside the base 9, the detector 7 is installed outside the base 9, 1550nm optical signals are introduced into the first optical fiber collimator 2, and the positions and angles of the first optical fiber collimator 2, the polarizer 3, the spectroscope 4, the faraday rotator 5, the second optical fiber collimator 6 and the detector 7 are adjusted so that the optical power received by the detector 7 is maximum. A 980nm pump laser, a faraday reflector and a wavelength division multiplexer, an erbium doped fiber 12, an isolator and a filter were connected in this order. The wavelength division multiplexer is used for coupling 980nm pump light and 1550nm signals together, and the Faraday reflector is used for returning backward ASE light into the erbium-doped optical fiber 12 for re-amplification, so that the power is improved and the polarization cancellation effect is achieved.
[ fiber-optic gyroscope ]
Referring to fig. 1, according to the optical fiber gyro 200 of the present disclosure, the optical fiber gyro 200 includes a relative intensity noise suppression device 100, and a Y waveguide 21 and an optical fiber sensing ring 22. The Y waveguide 21 is used for modulating and demodulating signals from the optical fiber sensing ring 22, and the optical fiber sensing ring 22 is used for at least containing sensing information for detecting angular velocity.
All advantages and effects of the optical fiber gyro 200 according to the present disclosure are the same as those of the aforementioned relative intensity noise suppression device 100 for an optical fiber gyro, and thus, the description of all advantages and effects of the optical fiber gyro according to the present disclosure is omitted herein.
The various exemplary embodiments are described using the above detailed description, but are not intended to be limited to the combinations explicitly disclosed herein. Thus, unless otherwise indicated, the various features disclosed herein may be combined together to form a number of additional combinations that are not shown for the sake of brevity.
Claims (10)
1. A relative intensity noise suppression device for an optical fiber gyroscope is characterized in that,
the relative intensity noise suppression device (100) comprises an ASE light source (1), a first optical fiber collimator (2), a polarizer (3), a spectroscope (4), a Faraday rotator (5), a second optical fiber collimator (6) and a single detector (7),
the first optical fiber collimator (2), the polarizer (3), the spectroscope (4) and the second optical fiber collimator (6) are sequentially arranged at intervals along the first direction (D1),
the Faraday rotator (5), the spectroscope (4) and the detector (7) are sequentially arranged at intervals along a second direction (D2), and the second direction (D2) is perpendicular to the first direction (D1);
the ASE light source (1) is used for emitting a light beam amplified by spontaneous emission;
the first optical fiber collimator (2) is used for receiving light emitted by the ASE light source (1) and converting the received light from the ASE light source (1) into parallel light;
the polarizer (3) is used for receiving the parallel light transmitted by the first optical fiber collimator (2) and converting the received parallel light into linearly polarized light;
the light splitter (4) is used for receiving the linearly polarized light of the polarizer (3) at an angle of 45 degrees so as to divide the linearly polarized light into two reflected light beams with equal power along a second direction (D2) and transmitted light beams with equal power along a first direction (D1);
the Faraday rotator (5) is used for reflecting the reflected light of the receiving spectroscope (4), rotating the polarization direction of the received reflected light by 90 degrees, and reflecting the reflected light of the spectroscope (4) rotated by 90 degrees back into the spectroscope (4) along a second direction (D2) as reference light;
the second optical fiber collimator (6) is used for connecting an external Y waveguide (21) and an optical fiber sensitive ring (22), the Y waveguide (21) is used for receiving the transmitted light of the second optical fiber collimator (6) and dividing the transmitted light into two branches to be supplied to the optical fiber sensitive ring (22) and modulating and demodulating signals from the optical fiber sensitive ring (22), the optical fiber sensitive ring (22) is used for at least containing sensing information for detecting angular velocity and returning signal light containing the sensing information to the Y waveguide (21), and the second optical fiber collimator (6) is used for transmitting the transmitted light of the receiving spectroscope (4) to the optical fiber sensitive ring (22) through the Y waveguide (21) and receiving the signal light containing the sensing information returned by the optical fiber sensitive ring (22) through the Y waveguide (21);
the spectroscope (4) is also used for transmitting the reference light from the Faraday rotator (5) and reflecting the signal light from the second optical fiber collimator (6) to the detector (7);
the detector (7) is used for receiving the reference light transmitted from the spectroscope (4) and the signal light reflected by the spectroscope (4).
2. The relative intensity noise suppression device of claim 1, wherein,
the ASE light source (1) comprises a pumping source (11), a Faraday reflector, a wavelength division multiplexer, an erbium-doped fiber (12), an isolator and a filter which are sequentially connected by optical fibers.
3. The relative intensity noise suppression device of claim 2, wherein,
the faraday reflector and the wavelength division multiplexer are integrated together to form a first integrated hybrid (13).
4. The relative intensity noise suppression device of claim 2, wherein,
the isolator and the filter are integrated together to form a second integrated hybrid device (14).
5. The relative intensity noise suppression device of claim 1, wherein,
the Faraday rotator (5) comprises a Faraday rotator (51) and a reflector (52),
in a second direction (D2), a Faraday rotator (51) is located between the mirror (52) and the beam splitter (4).
6. The relative intensity noise suppression device of claim 1, wherein,
the Faraday rotator (5) comprises a Faraday rotator (51) and a reflective film (53),
the reflective film (53) is coated on the surface of the Faraday rotator (51) facing away from the spectroscope (4) along the second direction (D2).
7. The relative intensity noise suppression device of claim 1, wherein,
the relative intensity noise suppression device (100) further comprises a first shell (8) and a seat body (9);
the first optical fiber collimator (2), the polarizer (3), the spectroscope (4), the Faraday rotator (5), the second optical fiber collimator (6), the single detector (7) and the base (9) are arranged on the first shell (8);
the first optical fiber collimator (2) is arranged on one side surface of the seat body (9) along a first direction (D1);
the polarizer (3) is arranged in the seat body (9);
the spectroscope (4) is arranged in the seat body (9);
the second optical fiber collimator (6) is arranged on the side surface of the seat body (9) opposite to the first optical fiber collimator (2) along the first direction (D1);
the detector (7) is mounted on the opposite side of the outside of the housing (9) from the Faraday rotator (5) along the second direction (D2).
8. The apparatus of claim 7, wherein the relative intensity noise suppression means,
the seat body (9) comprises an annular frame (91) and a supporting plate (92), and the supporting plate (92) is positioned inside the annular frame (91) and connected with the annular frame (91);
the first optical fiber collimator (2), the polarizer (3), the second optical fiber collimator (6) and the detector (7) are arranged on the annular frame (91);
the Faraday rotator (5) and the spectroscope (4) are mounted on a support plate (92).
9. The apparatus of claim 8, wherein the relative intensity noise suppression means,
the relative intensity noise suppression device (100) further comprises a second housing (10),
the second shell (10) and the first shell (8) can be detachably assembled together;
the pumping source (11) of the ASE light source (1) is arranged on the second shell (10);
the Faraday reflector, wavelength division multiplexer, erbium doped fiber (12), isolator and filter are wound around an annular frame (91).
10. A fiber optic gyroscope is characterized in that,
the fiber optic gyroscope (200) comprising the relative intensity noise suppression device (100) of any one of claims 1-9, and a Y-waveguide (21) and a fiber optic sensitive ring (22);
the Y waveguide (21) is used for modulating and demodulating signals from the optical fiber sensitive ring (22), and the optical fiber sensitive ring (22) is used for at least containing sensing information for detecting the angular velocity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311034597.7A CN117029801A (en) | 2023-08-15 | 2023-08-15 | Relative intensity noise suppression device for optical fiber gyroscope and optical fiber gyroscope |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311034597.7A CN117029801A (en) | 2023-08-15 | 2023-08-15 | Relative intensity noise suppression device for optical fiber gyroscope and optical fiber gyroscope |
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| CN117029801A true CN117029801A (en) | 2023-11-10 |
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| CN202311034597.7A Pending CN117029801A (en) | 2023-08-15 | 2023-08-15 | Relative intensity noise suppression device for optical fiber gyroscope and optical fiber gyroscope |
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