CN115014318A - Hollow microstructure optical fiber gyroscope - Google Patents
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- 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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Abstract
The invention relates to the technical field of fiber optic gyroscopes, in particular to a hollow-core microstructure fiber optic gyroscope which comprises a light source, a circulator, a Y waveguide, two adjustable depolarization units and a hollow-core microstructure fiber loop, wherein each adjustable depolarization unit comprises an 1/4 wave plate, a reflector, a polarization beam splitter, an adjustable fiber delay line and a Faraday reflector, the 1/4 wave plate and the reflector are sequentially fixed at the reflection end of the polarization beam splitter, the optical axis of the 1/4 wave plate forms an included angle of 45 degrees with the reflection optical axis of the polarization beam splitter, one end of the adjustable fiber delay line is in collimation coupling with the transmission end of the polarization beam splitter, the other end of the adjustable fiber delay line is in collimation coupling with the Faraday reflector, the light source, the circulator and the Y waveguide are sequentially connected, two tail fibers of the Y waveguide are in collimation coupling with the input end of the polarization beam splitter, and the output end of the polarization beam splitter is respectively coupled with two tail fibers of the fiber loop. The gyroscope provided by the invention ensures the stable output signal-to-noise ratio of the hollow-core microstructure fiber optic gyroscope, and can be suitable for large fiber length application of the gyroscope.
Description
Technical Field
The invention relates to the technical field of fiber optic gyroscopes, in particular to a hollow-core microstructure fiber optic gyroscope.
Background
The fiber optic gyroscope is an angular rate optical sensor which adopts optical fibers as a sensing medium and is based on the Sagnac effect, is widely applied to inertial autonomous navigation systems in the fields of sea, land, air, sky and the like, and becomes one of mainstream inertial instruments. The new application requirements under severe environments such as rapid temperature change, large magnetic field, high irradiation and the like provide new challenges for improving the environmental adaptability of the fiber optic gyroscope. Under the technical framework of the traditional optical fiber gyroscope, the environmental sensitivity of the solid core optical fiber used by the optical fiber ring becomes the material limitation for improving the environmental adaptability of the optical fiber gyroscope, so that the active improvement means of the environmental adaptability of the optical fiber gyroscope is deficient, and only at the cost of volume, weight and power consumption, passive technical measures such as temperature control and compensation, multiple shielding and sealing and the like are adopted at a system level for inhibiting, thereby weakening the advantage of engineering application of the optical fiber gyroscope in extreme environments.
The hollow-core microstructure optical fiber enables light waves to be efficiently bound in the air fiber core for transmission through the cladding microstructure, the air is used as a transmission medium, the light waves are not sensitive to influences of heat, magnetism, irradiation and the like in the environment, ideal high-stability light transmission can be realized, and the technical problem of actively improving the environmental adaptability of the optical fiber gyroscope is expected to be fundamentally solved. However, the application of the hollow-core micro-structured fiber to the fiber-optic gyroscope faces several engineering application problems, and one of them is how to effectively suppress polarization-dependent noise. The fiber-optic gyroscope generally adopts a full polarization maintaining optical path scheme to realize efficient suppression of polarization-related noise so as to meet the high-precision application requirement of an inertial system, so that the traditional solid-core polarization maintaining optical fiber is the first choice of sensing materials, such as a widely-used panda-type polarization maintaining optical fiber. Polarization-maintaining capability in conventional solid core optical fibers can be achieved by stress birefringence and structural birefringence, with typical phase birefringence (Δ n) up to 10 -4 Magnitude. However, the design of birefringence in hollow-core microstructured optical fibers is very difficult. Firstly, the hollow-core micro-structure optical fiber is characterized in that air holes arranged in an end face periodic structure penetrate through the whole optical fiber along the axial direction on a single dielectric material (usually, a pure silicon dioxide material is selected), and a brand-new light guide mechanism is formed by utilizing a cladding micro-structure, so that light waves are efficiently bound in an air fiber core for transmission. The hollow-core microstructure optical fiber adopts air as a transmission medium, and cannot generate stress birefringence by virtue of photoelastic effect. In addition, most hollow-core microstructured optical fibers work in a weak conduction state, and structural birefringence cannot be effectively formed in the weak conduction state. At present, the excitation mode of the thickness difference of the microstructure glass wall with nanometer magnitude in two orthogonal directions is utilized to be reversedWhen the cross-coupling effect realizes high birefringence, on one hand, the preparation difficulty of the optical fiber is improved, the thicknesses of the glass walls around the hollow core in two vertical directions need to be different and have proper values, and the thickness difference needs to be controlled in a nanometer level generally. The extremely high control requirement of the structural dimension difference of the optical fiber is difficult to stably realize in the drawing of the long-distance hollow-core micro-structural optical fiber. On the other hand, the transmission loss is increased, and the length of the optical fiber used in the optical fiber gyroscope directly determines the accuracy level of the gyroscope. The hollow-core microstructure optical fiber is difficult to realize birefringence so as to have good polarization maintaining capability, so that polarization-related noise in the gyroscope cannot be effectively inhibited, and the hollow-core microstructure optical fiber is a technical obstacle in application to an optical fiber gyroscope, and the polarization maintaining capability of the hollow-core microstructure optical fiber cannot support large fiber length application of the gyroscope.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a hollow-core micro-structural fiber optic gyroscope, which can dynamically adjust the parameters of a depolarization unit according to the decoherence length of a light source used by the gyroscope, so that high polarized light transmitted in a hollow-core micro-structural fiber loop is converted into ideal unpolarized light (the polarization degree is 0), the problem of gyroscope interference signal fading caused by light polarization state change caused by the environment such as temperature, stress, magnetic field and the like of the unpolarized hollow-core micro-structural fiber is solved, 50% of light can be returned to pass through a Y wave conduction optical axis, the output signal-to-noise ratio of the hollow-core micro-structural fiber optic gyroscope is ensured to be stable, and the gyroscope can be suitable for the application of large fiber length of the gyroscope.
The invention is realized by the following technical scheme:
a hollow-core microstructure fiber-optic gyroscope comprises a light source, a circulator, a Y waveguide, two adjustable depolarization units and a hollow-core microstructure fiber-optic ring, wherein each adjustable depolarization unit comprises 1/4 wave plates, a reflector, a polarization beam splitter, an adjustable fiber delay line and a Faraday reflector, the 1/4 wave plates and the reflector are sequentially fixed at the reflection end of the polarization beam splitter, the optical axis of the 1/4 wave plate forms an included angle of 45 degrees with the reflection optical axis of the polarization beam splitter, one end of the adjustable fiber delay line is in collimation coupling with the transmission end of the polarization beam splitter through a transmission end fiber collimation sealing joint, the other end of the adjustable fiber delay line is in collimation coupling with the Faraday reflector, the light source is connected with the input end of the circulator, the output end of the circulator is connected with the input end of the Y waveguide, two tail fibers of the Y waveguide are respectively in collimation coupling with the input end of the polarization beam splitter of the corresponding adjustable depolarization unit through an input end fiber collimation sealing joint, and the slow axis of the input end optical fiber collimation sealing joint and the transmission optical axis of the polarization beam splitter form an included angle of 45 degrees, and the output ends of the polarization beam splitters of the two adjustable depolarization units are respectively coupled with two tail fibers of the hollow microstructure optical fiber ring through the output end optical fiber collimation sealing joint.
Furthermore, the hollow-core microstructure fiber-optic gyroscope also comprises a detector and a processing circuit board, wherein an input port of the detector is connected with a detection port of the circulator, an output port of the detector is connected with an input port of the processing circuit board, and an output port of the processing circuit board is connected with a Y waveguide modulation port.
Preferably, the 1/4 wave plate and the reflector are sequentially bonded and fixed to the reflection end of the polarization beam splitter.
Furthermore, the input end optical fiber collimation sealing joint, the output end optical fiber collimation sealing joint and the perspective end optical fiber collimation sealing joint respectively comprise a tail fiber, a ceramic ferrule, a lens, a metal sheath and a sealing rubber ring, the ceramic ferrule is arranged in the metal sheath, two ends of the ceramic ferrule are sealed and fixed with the metal sheath through the sealing rubber ring, the front end face of the ceramic ferrule is an inclined plane, the lens is fixedly arranged at the front end of the metal sheath, the rear end face of the lens is an inclined plane matched with the front end face of the ceramic ferrule, the tail fiber is fixedly inserted in the ceramic ferrule, and the front end of the tail fiber extends out of the ceramic ferrule.
Preferably, the angle of inclination of the ramp is 8 °.
Preferably, the tail fiber of the input end fiber alignment sealing joint is a traditional panda type polarization maintaining fiber.
Preferably, the tail fiber of the output end fiber alignment sealing joint is a hollow microstructure fiber.
Preferably, the light source is a narrow linewidth laser.
Advantageous effects of the invention
The hollow-core microstructure fiber-optic gyroscope provided by the invention has the following advantages:
1. by arranging the two adjustable depolarization units, polarized light of the hollow-core microstructure fiber optic gyroscope and a transmission optical axis of a polarization beam splitter of the adjustable depolarization unit form an included angle of 45 degrees and enter the polarization beam splitter, the polarized light and the transmission optical axis are decomposed into horizontal polarized light and vertical polarized light with equal quantity, and finally, the two paths of light are output and combined at a common output port to form light waves with equal amplitude values on two orthogonal polarization axes.
2. Due to the arrangement of the adjustable depolarization unit, the problem of gyro interference signal fading caused by light polarization state change of the non-polarization-maintaining hollow-core microstructure optical fiber under the environment of temperature, stress, magnetic field and the like is solved, so that the optical fiber gyro can be suitable for the application of large fiber length of the gyro.
3. Because the output ports of the first adjustable depolarization unit and the second adjustable depolarization unit are respectively connected with two tail fibers of a hollow-core microstructure optical fiber ring, the light waves after being subjected to non-polarized light treatment by the first adjustable depolarization unit are oppositely transmitted in the hollow-core microstructure optical fiber ring, two light waves return to respectively pass through the second adjustable depolarization unit and the first adjustable depolarization unit in a reverse direction, a polarization beam splitter in the first adjustable depolarization unit decomposes each light wave into two orthogonal polarized light again, the optical path difference between the two orthogonal polarized light becomes larger again, and the depolarization effect is more favorably improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a fiber alignment sealing joint configuration;
FIG. 3 is a schematic diagram of a hollow-core microstructured optical fiber;
in the figure: 1. the optical fiber polarization splitter comprises a light source, 2 a circulator, 3 a Y waveguide, 4 an input end optical fiber collimation sealing joint, 5 a reflector, 6 an adjustable depolarization unit I, 7 a Faraday reflector, 8 a hollow-core microstructure optical fiber ring, 9 an adjustable optical fiber delay line, 10 a transmission end optical fiber collimation sealing joint, 11 an output end optical fiber collimation sealing joint, 12 an adjustable depolarization unit II, 13 a processing circuit board, 14 a detector, 15 a polarization beam splitter, 16.1/4 wave plates, 17 ceramic ferrules, 18 lenses, 19 sealing rubber rings, 20 metal sheaths, 21 bonding rubber and 22 pigtails.
Detailed Description
A hollow-core microstructured fiber optic gyroscope, as shown in fig. 1: the device comprises a light source 1, a circulator 2, a Y waveguide 3, two adjustable depolarization units and a hollow-core microstructure optical fiber ring 8.
Each adjustable depolarization unit comprises 1/4 wave plates 16, a reflector 5, a polarization beam splitter 15, an adjustable optical fiber delay line 9 and a Faraday reflector 7, wherein the 1/4 wave plate and the reflector are sequentially fixed at the reflection end of the polarization beam splitter, the optical axis of the 1/4 wave plate forms an included angle of 45 degrees with the reflection optical axis of the polarization beam splitter, vertical polarized light is reflected by the reflector after passing through the 1/4 wave plate and then reflected to the 1/4 wave plate to form parallel polarized light, and the parallel polarized light is transmitted and output from the output end of the polarization beam splitter.
One end of the adjustable optical fiber delay line is coupled with the transmission end of the polarization beam splitter in a collimating way through the transmission end optical fiber collimating and sealing joint 10, and the other end of the adjustable optical fiber delay line is coupled with the Faraday reflector in a collimating way. The adjustable optical fiber delay line can provide the delay amount of light transmission by changing the optical path, so that the optical path difference between two light waves is larger than the decoherence length of the light source, and the unpolarized light effect is presented overall.
The light source is connected with the input end of the circulator, the output end of the circulator is connected with the input end of the Y waveguide, two tail fibers of the Y waveguide are respectively coupled with the input end of the polarization beam splitter of the corresponding adjustable depolarization unit in an aligned mode through the input end optical fiber alignment sealing joint 4, the slow axis of the input end optical fiber alignment sealing joint forms an included angle of 45 degrees with the transmission optical axis of the polarization beam splitter, and incident light can be split into horizontal polarized light and vertical polarized light in the same amount after reaching the polarization beam splitter. Light emitted by the light source enters the input port of the circulator, is output to the Y waveguide from the output port of the circulator to form two beams of light after polarization and beam splitting, and the two beams of light respectively enter the corresponding polarization beam splitters and are decomposed into horizontal polarized light and vertical polarized light which are equal in quantity.
The output ends of the polarization beam splitters of the two adjustable depolarization units are respectively coupled with two tail fibers of the hollow-core microstructure fiber ring through an output end fiber collimation sealing joint 11. The light waves after being processed by the non-polarized light by the adjustable depolarization unit are transmitted in the hollow microstructure optical fiber ring in opposite directions, two light waves return to respectively pass through the corresponding adjustable depolarization unit in opposite directions, the polarization beam splitter in the adjustable depolarization unit decomposes each light wave into two orthogonal polarized lights again, the optical path difference between the two orthogonal polarized lights becomes larger again, and the depolarization effect is more favorably improved.
The input end optical fiber collimation sealing joint, the output end optical fiber collimation sealing joint and the transmission end optical fiber collimation sealing joint can play a role in collecting and transmitting light beams.
The depolarization principle of the hollow-core microstructure fiber optic gyroscope is as follows: light emitted by a light source enters an input port of a circulator, is output to a Y waveguide from an output port of the circulator to form two beams of light which enter a polarization beam splitter from input ports of polarization beam splitters of an adjustable depolarization unit I6 and an adjustable depolarization unit II 12 respectively and are decomposed into horizontal polarized light and vertical polarized light with equal quantity, the horizontal polarized light outputs transmission light from a transmission end of the polarization beam splitter to an adjustable optical fiber delay line and then is output to a Faraday reflector, the Faraday reflector rotates the polarization state of the received transmission light by 90 degrees and then reflects the transmission light to the adjustable optical fiber delay line and then outputs the transmission light to the polarization beam splitter, and the polarization beam splitter converts the vertical light into vertical polarized light and reflects the vertical polarized light from the output port of the polarization beam splitter to be output; the vertically polarized light passes through 1/4 wave plate, is reflected by the reflector, is converted into parallel polarized light by 1/4 wave plate, and is transmitted and output from the output port of the polarization beam splitter. The two beams of light are output and combined at a common output port to form light waves with equal amplitude on two orthogonal polarization axes, the polarization directions of the transmitted return light and the reflected return light are orthogonal, the amplitudes of the transmitted return light and the reflected return light are equal, and meanwhile, the optical path difference between the transmitted return light and the reflected return light is larger than the decoherence length of a light source, so that the light at the output port of the adjustable depolarization unit is converted into unpolarized light. The delay amount of the optical fiber delay line can be adjusted according to the decoherence length of the light source for the gyroscope, so that the complete unpolarization treatment of high polarized light after various light sources (broadband ASE light sources, narrow-linewidth lasers and the like) are polarized by Y waveguide is realized, particularly the combination of the narrow-linewidth lasers and the hollow micro-structure optical fibers in the interference type gyroscope can be supported, the short board of the scale factor stability improvement technology of the optical fiber gyroscope is broken through, the problem of gyroscope interference signal fading caused by the light polarization state change of the non-polarization-maintaining hollow micro-structure optical fibers under the environment of temperature, stress, magnetic field and the like is avoided, 50% of light can be ensured to return to pass through the light passing axis of the Y waveguide, the stability of the output signal-to-noise ratio of the hollow micro-structure optical fiber gyroscope is ensured, and the optical fiber gyroscope is not limited by the polarization maintaining capability of the long-distance hollow micro-structure optical fibers any more.
Meanwhile, due to the arrangement of the adjustable depolarization unit, the problem of gyro interference signal fading caused by light polarization state change of the non-polarization-maintaining hollow-core microstructure optical fiber under the environments of temperature, stress, magnetic field and the like is solved, so that the optical fiber gyro can be suitable for the application of large fiber length of the gyro.
And because the output ports of the first adjustable depolarization unit and the second adjustable depolarization unit are respectively connected with two tail fibers of the hollow-core microstructure optical fiber ring, the light waves after being subjected to non-polarized light treatment by the first adjustable depolarization unit are oppositely transmitted in the hollow-core microstructure optical fiber ring, two light waves return to respectively pass through the second adjustable depolarization unit and the first adjustable depolarization unit in a reverse direction, when the light waves pass through the first adjustable depolarization unit in the reverse direction, the polarization beam splitter in the first adjustable depolarization unit decomposes each light wave into two orthogonal polarized light beams again, and the optical path difference between the two orthogonal polarized light beams is enlarged again, thereby being more beneficial to improving the depolarization effect.
Further, the hollow-core microstructure fiber-optic gyroscope also comprises a detector 14 and a processing circuit board 13, wherein an input port of the detector is connected with a detection port of the circulator, an output port of the detector is connected with an input port of the processing circuit board, and an output port of the processing circuit board is connected with a Y waveguide modulation port.
The light wave processed by the unpolarized light returns along the adjustable depolarization unit, when the light wave is output from the original input port of the adjustable depolarization unit, because the slow axis of the polarization-maintaining tail fiber forms an included angle of 45 degrees with the transmission optical axis of the polarization beam splitter, the light wave is equally divided into the slow axis and the fast axis of the Y waveguide polarization-maintaining tail fiber, two beams of light waves transmitted in opposite directions finally reach the Y waveguide to be converged, 50% of the light waves can be reserved and interfered when passing through the polarizer in the Y waveguide, and the phase difference between the two beams of light is in direct proportion to the rotation angular velocity. Two bunches of light interference light intensity transmit to circulator output port, can detect the port by the circulator and transmit for the detector and carry out photoelectric conversion again, and the signal of telecommunication can obtain the angular velocity information of rotation of top after being handled by processing circuit board.
Preferably, the 1/4 wave plate and the reflector are sequentially stuck and fixed with the reflection end of the polarization beam splitter, so that the adjustable aperture, the 1/4 wave plate and the reflector are conveniently and fixedly installed with the polarization beam splitter.
Further, the input end optical fiber collimation seal joint, the output end optical fiber collimation seal joint and the perspective end optical fiber collimation seal joint respectively comprise a tail fiber 22, a ceramic ferrule 17, a lens 18, a metal sheath 20 and a seal rubber ring 19, specifically, as shown in fig. 2, the ceramic ferrule is installed in the metal sheath, two ends of the ceramic ferrule are sealed and fixed with the metal sheath through the seal rubber ring, the front end face of the ceramic ferrule is an inclined plane, the lens is fixedly installed at the front end of the metal sheath, the rear end face of the lens is an inclined plane matched with the front end face of the ceramic ferrule, the front end face of the ceramic ferrule is an inclined plane, and the rear end face of the lens is an inclined plane matched with the front end face of the ceramic ferrule, so that the reflection of the end faces can be inhibited to form return light. The tail fiber is fixedly inserted into the ceramic ferrule, the front end of the tail fiber extends out of the ceramic ferrule, and the outer surface of the tail fiber and the inner hole of the ceramic ferrule can be coated with adhesive glue 21 for reinforcing connection.
Preferably, the inclined plane is inclined at an angle of 8 °, so that the end surface reflection can be better inhibited to form return light.
Preferably, the tail fiber of the input end fiber alignment sealing joint is a traditional panda type polarization maintaining fiber, and is conveniently matched with a Y waveguide tail fiber type.
Preferably, the tail fiber of the output end fiber collimation sealing joint is a hollow micro-structure fiber which is convenient to match with the type of the gyroscope ring fiber, the hollow micro-structure fiber can be a hollow anti-resonance fiber, a hollow photonic crystal fiber or other types of hollow micro-structure fibers, and the specific structure can be shown in figure 3.
Preferably, the light source is a narrow linewidth laser.
In summary, the hollow-core microstructure fiber optic gyroscope provided by the invention does not depend on the polarization maintaining capability of the hollow-core microstructure fiber, the corresponding polarization-adjustable units are respectively arranged between the hollow-core microstructure fiber loop and the two tail fiber ports of the Y waveguide, so that high-polarization light transmitted in the hollow-core fiber loop is completely converted into ideal non-polarization light, 50% of light can be always ensured to return to a detector through a light-transmitting axis of the Y waveguide and finally reach a gyroscope for signal demodulation, and the problems that two paths of interference light signals transmitted by the gyroscope in opposite directions fluctuate, fade and even cancel due to polarization state change of light waves in the non-polarization-maintaining hollow-core microstructure fiber caused by environmental influence are solved. The hollow-core microstructure fiber optic gyroscope is suitable for any type of hollow-core microstructure fiber, such as a hollow-core antiresonant fiber, a hollow-core photonic band gap fiber and the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A hollow-core microstructure fiber-optic gyroscope is characterized by comprising a light source, a circulator, a Y waveguide, two adjustable depolarization units and a hollow-core microstructure fiber-optic ring, wherein each adjustable depolarization unit comprises 1/4 wave plates, a reflector, a polarization beam splitter, an adjustable fiber delay line and a Faraday reflector, the 1/4 wave plates and the reflectors are sequentially fixed at the reflection end of the polarization beam splitter, the optical axis of the 1/4 wave plate forms an included angle of 45 degrees with the reflection optical axis of the polarization beam splitter, one end of the adjustable fiber delay line is in collimation coupling with the transmission end of the polarization beam splitter through a transmission end fiber collimation sealing joint, the other end of the adjustable fiber delay line is in collimation coupling with the Faraday reflector, the light source is connected with the input end of the circulator, the output end of the circulator is connected with the input end of the Y waveguide, two tail fibers of the Y waveguide are respectively in collimation coupling with the input end of the polarization beam splitter of the corresponding adjustable depolarization unit through an input end fiber collimation sealing joint, and the slow axis of the input end optical fiber collimation sealing joint and the transmission optical axis of the polarization beam splitter form an included angle of 45 degrees, and the output ends of the polarization beam splitters of the two adjustable depolarization units are respectively coupled with two tail fibers of the hollow microstructure optical fiber ring through the output end optical fiber collimation sealing joint.
2. The hollow-core microstructure fiber-optic gyroscope of claim 1, wherein the fiber-optic gyroscope further comprises a detector and a processing circuit board, an input port of the detector is connected with the detection port of the circulator, an output port of the detector is connected with an input port of the processing circuit board, and an output port of the processing circuit board is connected with the Y-waveguide modulation port.
3. The hollow-core microstructure fiber optic gyroscope of claim 1 or 2, wherein the 1/4 wave plate and the mirror are sequentially affixed to a reflective end of the polarization beam splitter.
4. The hollow-core microstructure fiber optic gyroscope according to claim 1 or 2, wherein the input end fiber alignment sealing joint, the output end fiber alignment sealing joint and the perspective end fiber alignment sealing joint each include a pigtail, a ferrule, a lens, a metal sheath and a sealing rubber ring, the ferrule is mounted in the metal sheath, two ends of the ferrule are sealed and fixed with the metal sheath through the sealing rubber ring, a front end face of the ferrule is an inclined face, the lens is fixedly mounted at a front end of the metal sheath, a rear end face of the lens is an inclined face matched with the front end face of the ferrule, the pigtail is fixedly inserted in the ferrule, and a front end of the pigtail extends out of the ferrule.
5. A hollow-core micro-structured fiber optic gyroscope according to claim 4, wherein the slope is inclined at an angle of 8 °.
6. The hollow-core microstructure fiber-optic gyroscope of claim 1 or 2, wherein the pigtail of the input-end fiber-alignment sealing joint is a traditional panda-type polarization-maintaining fiber.
7. A hollow-core micro-structured fiber optic gyroscope according to claim 1 or claim 2, wherein the pigtail of the output end fiber alignment hermetic connector is a hollow-core micro-structured fiber.
8. A hollow-core micro-structured fiber optic gyroscope according to claim 1 or claim 2, wherein the light source is a narrow linewidth laser.
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Cited By (5)
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| CN115963602A (en) * | 2022-12-26 | 2023-04-14 | 武汉灵途传感科技有限公司 | Polarization-maintaining optical fiber circulator |
| CN116045956A (en) * | 2023-03-31 | 2023-05-02 | 中国船舶集团有限公司第七〇七研究所 | Optical fiber gyroscope and optical polarization state sensing rotation-based method thereof |
| CN116429080A (en) * | 2023-06-13 | 2023-07-14 | 中国船舶集团有限公司第七〇七研究所 | Gyroscope based on high-stability hollow microstructure optical fiber ring |
| CN117394123A (en) * | 2023-12-12 | 2024-01-12 | 华南师范大学 | Ytterbium-doped fiber laser |
| CN118583150A (en) * | 2024-08-07 | 2024-09-03 | 中国船舶集团有限公司第七〇七研究所 | High-precision polarization-preserving hollow-core photonic crystal fiber gyroscope based on polarization measurement |
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