CN114166201B - Integrated polarization suppression optical fiber resonant cavity - Google Patents
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- CN114166201B CN114166201B CN202111428245.0A CN202111428245A CN114166201B CN 114166201 B CN114166201 B CN 114166201B CN 202111428245 A CN202111428245 A CN 202111428245A CN 114166201 B CN114166201 B CN 114166201B
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/2766—Manipulating the plane of polarisation from one input polarisation to another output polarisation, e.g. polarisation rotators, linear to circular polarisation converters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
Abstract
The invention provides an integrated polarization suppression fiber resonant cavity based on spatial coupling, which comprises a base (30), and a first input optical channel, a second input optical channel, a circulating optical channel, a first output optical channel and a second output optical channel which are integrated on the base (30). The invention integrates all optical parts to effectively reduce the volume of the optical fiber resonant cavity, can well inhibit the polarization fluctuation noise in the resonant cavity by the special arrangement mode of the optical fiber, the polarizer and other components, and is suitable for novel optical fibers, especially hollow optical fibers.
Description
Technical Field
The invention belongs to the field of optical fiber resonant cavities, and particularly relates to an integrated polarization suppression optical fiber resonant cavity.
Background
A Resonant Fiber Optic Gyro (RFOG) is an angular rate sensor that obtains angular velocity information based on the Sagnac effect through detection of clockwise and counterclockwise beam frequencies within a Fiber Optic resonant cavity. The resonant fiber-optic gyroscope combines the advantages of the resonant detection of the laser gyroscope and the multi-turn optical path of the interference fiber-optic gyroscope, is expected to realize high-precision measurement under the condition of shorter fiber-optic length, has the potential of becoming the next generation of small-volume navigation-level gyroscope, and is an important direction for the development of the optical gyroscope.
The main sensitive component in the resonant fiber-optic gyroscope is a fiber-optic resonant cavity, and the performance of the resonant fiber-optic gyroscope directly influences the precision of the gyroscope. Two orthogonal eigen polarizations (ESOP) exist in the fiber cavity when the gyroscope is in operation. However, under the influence of the external environment, the two polarization states have fluctuation and crosstalk, so that superposition and interference effects are generated, and the resonance signals are asymmetric and fluctuate. This noise generated in the gyro output by the polarization fluctuation is polarization fluctuation noise. The polarization fluctuation noise is one of important noise sources in the resonant fiber optic gyro system.
At present, the optical fiber resonant cavity is mostly formed by adopting a high-temperature fusion mode of a solid-core polarization-maintaining optical fiber coupler, and the fiber core of the polarization-maintaining optical fiber is made of quartz glass, so that the fiber core is easily influenced by the ambient temperature, the optical noise is high, and the further development of the optical fiber resonant cavity is restricted. The hollow-core photonic crystal fiber is a novel fiber, has better temperature sensitivity and multiple optical properties than the conventional fiber, and has smaller bending radius, which is favorable for miniaturization of a fiber resonant cavity. Air holes are formed in the fibers of the hollow-core optical fibers, so that the air holes are easy to collapse due to high-temperature welding to cause large loss, and the hollow-core optical fibers are not suitable for a traditional welding mode. The lack of a correspondingly ideal coupler limits the use of photonic crystal fibers in fiber resonators.
In order to suppress the influence of polarization fluctuation noise on the gyro, a method of controlling an axial error at the time of welding or adding an on-line polarizer in a resonator is generally adopted. The former needs high precision to strictly control the alignment angle, and the latter is not suitable for miniaturization due to welding of optical fiber devices and is not suitable for hollow-core photonic crystal fibers. Meanwhile, because the optical fiber at the welding point is fragile, the miniaturization of the optical fiber resonant cavity is limited due to the larger minimum bending radius of the optical fiber, and therefore, the existing optical fiber resonant cavity cannot better meet the requirements of miniaturization and single polarization performance.
Disclosure of Invention
The purpose of the invention is as follows: the utility model provides a polarization restraines fiber resonator integrates based on space coupling, when effectively reducing fiber resonator volume with the integration of all optical parts, through components and parts special setting mode such as optic fibre, polarizer can be fine restrain the undulant noise of polarization in the resonator, and this scheme is applicable to novel optic fibre, especially hollow optic fibre.
The technical scheme of the invention is as follows: providing an integrated polarization-suppressing fiber resonator, which comprises a base 30, and a first input optical channel, a second input optical channel, a circulating optical channel, a first output optical channel and a second output optical channel which are arranged on the base 30;
the first input optical channel comprises a first emission optical fiber 1, a first coupling lens 5 and a first polarizer 13; the second input optical channel comprises a second input optical fiber 2, an eighth coupling lens 12 and a first polarizer 13;
the circulating light channel comprises a first beam splitter 15, a second coupling lens 6, a first optical fiber upper end 21 and a first optical fiber lower end 22 of a first optical fiber 19, a third coupling lens 7, a second beam splitter 16, a fourth polarizer 26, a third beam splitter 17, a sixth coupling lens 10, a second optical fiber lower end 23 and a second optical fiber upper end 24 of a second optical fiber 20, a seventh coupling lens 11, a fourth beam splitter 18 and a third polarizer 25 which are sequentially arranged;
the first output optical channel comprises a second polarizer 14, a fourth coupling lens 8 and a first receiving optical fiber 3 which are arranged in sequence; the second output optical channel comprises a second polarizer 14, a fifth coupling lens 9 and a second receiving optical fiber 4 which are arranged in sequence;
the first light b1 passes through the first input optical channel, is reflected into the circulating optical channel by the first beam splitter 15, forms first circulating light b10 after being recycled for multiple times, and the first circulating light b10 is reflected into the first output optical channel by the second beam splitter 16 and is output;
the second light b2 passes through the second input optical channel, is reflected into the circulating optical channel by the fourth beam splitter 18, forms second circulating light b20 after multiple cycles, and the second circulating light b20 is reflected into the second output optical channel by the third beam splitter 17 to be output.
Optionally, the polarization directions of the first polarizer 13 and the third polarizer 25 are the same, and both are the first polarization direction Z1; the polarization directions of the second polarizer 14 and the fourth polarizer 26 are the same, and are both the second polarization direction Z2; the first polarization direction Z1 is orthogonal to the second polarization direction Z2.
Optionally, the first fiber 19 and the second fiber 20 each comprise a first polarization axis P1 and a second polarization axis P2;
the first polarization axis P1 of the first fiber upper end 21 is the same as the first polarization direction Z1, and the first polarization axis P1 of the first fiber lower end 22 is the same as the second polarization direction Z2;
the second polarization axis P2 of the second fiber upper end 24 is the same as the first polarization direction Z1, and the second polarization axis P2 of the second fiber lower end 23 is the same as the second polarization direction Z2;
the first polarization axis P1 of the first fiber upper end 21 is aligned with the second polarization axis P2 of the second fiber upper end 24;
the first polarization axis P1 of the first fiber lower end 22 is aligned with the second polarization axis P2 of the second fiber lower end 23.
Optionally, the first polarizer 13 is a polarizing plate, and the third polarizer 25 is a polarizing plate or a polarization splitting prism.
Optionally, the first polarizer 13, the second polarizer 14, the third polarizer 25 and the fourth polarizer 26 are all inclined at 8 ° to the optical path to reduce the backscattered light.
Optionally, the difference in length between the first optical fiber 19 and the second optical fiber 20 is less than three thousandths of the length of the first optical fiber 19 or the second optical fiber 20.
Alternatively, the first optical fiber 19 and the second optical fiber 20 are wound clockwise or counterclockwise in a plurality of turns into a loop.
Optionally, the first beam splitter 15 and the second beam splitter 16 are tilted at 45 ° with respect to the first light ray b 1; the fourth beam splitter 18 and the third beam splitter 17 are tilted at 45 ° with respect to the second light ray b 2.
Alternatively, the susceptor 30 is a silicon-based semiconductor wafer.
The invention has the advantages that: the invention adopts the space optical principle to realize the function of the optical fiber resonant cavity, avoids the traditional welding mode and is suitable for novel optical fibers, particularly hollow optical fibers; the invention adopts the specially arranged component parameters and the light path structure form, realizes a reciprocal light path for polarization fluctuation suppression, is beneficial to reducing the polarization fluctuation noise of the gyroscope and suppressing the common mode error of the gyroscope; the invention integrates the discrete components of the traditional resonant cavity on the substrate, thus being beneficial to packaging and miniaturization; the method has important significance for reducing the volume of the optical fiber resonant cavity, inhibiting the noise of the optical fiber resonant cavity and improving the signal to noise ratio of the gyroscope.
The optical fiber resonant cavity has a polarization fluctuation suppression characteristic, a secondary resonance peak (dotted line) corresponding to a secondary polarization state in a frequency spectrum curve is far away from a main resonance peak (solid line) corresponding to a main polarization state, and fluctuation between frequencies of the main resonance peak and the secondary resonance peak and amplitude of the secondary polarization peak are suppressed, so that polarization fluctuation noise caused by the secondary resonance peak can be reduced.
Description of the drawings:
FIG. 1 is a schematic diagram of an integrated polarization-suppressing fiber resonator according to the present invention;
FIG. 2 is a schematic diagram of the structure of a first fiber upper port (left view) and a second fiber upper port (right view) according to the present invention;
FIG. 3 is a schematic diagram of the structure of a first polarizer (top view) and a second polarizer (bottom view);
fig. 4 is a graph showing the spectral distribution of the first light ray b1 and the second light ray b2 received by the first receiving fiber 3 and the second receiving fiber 4 at different input optical frequencies.
The optical fiber comprises 1-a first transmitting optical fiber, 2-a second transmitting optical fiber, 3-a first receiving optical fiber, 4-a second receiving optical fiber, 5-a first coupling lens, 6-a second coupling lens, 7-a third coupling lens, 8-a fourth coupling lens, 9-a fifth coupling lens, 10-a sixth coupling lens, 11-a seventh coupling lens, 12-an eighth coupling lens, 13-a first polarizer, 14-a second polarizer, 15-a first beam splitter, 16-a second beam splitter, 17-a third beam splitter, 18-a fourth beam splitter, 19-a first optical fiber, 20-a second optical fiber, 21-a first optical fiber upper end, 22-a first optical fiber lower end, 23-a second optical fiber upper end, 24-a second optical fiber lower end, 25-a third polarizer, 26-a fourth beam splitter, 30-a base, b 1-a first light ray, b 2-a second light, b 10-a first circulating light, b 20-a second circulating light.
The specific implementation mode is as follows:
the invention is further illustrated by the following figures:
example 1
Referring to fig. 1, the present embodiment provides a miniaturized single-polarization fiber resonator. The invention discloses an integrated polarization suppression fiber resonant cavity, which comprises: the optical fiber coupler comprises a first optical fiber 19, a second optical fiber 20, a base 30, and a first emitting optical fiber 1, a second emitting optical fiber 2, a first receiving optical fiber 3, a second receiving optical fiber 4, a first coupling lens 5, a second coupling lens 6, a third coupling lens 7, a fourth coupling lens 8, a fifth coupling lens 9, a sixth coupling lens 10, a seventh coupling lens 11, an eighth coupling lens 12, a first polarizer 13, a second polarizer 14, a first beam splitter 15, a second beam splitter 16, a third beam splitter 17, a fourth beam splitter 18, a first optical fiber upper end 21, a first optical fiber lower end 22, a second optical fiber lower end 23, a second optical fiber upper end 24, a third polarizer 25, a fourth polarizer 26, a first optical fiber b1, a second optical fiber b2, a first circulating light b10, and a second circulating light b20 which are arranged on the base.
The first optical fiber 19 and the second optical fiber 20 are wound clockwise or counterclockwise for a plurality of turns to form a ring, and both ends are fixed on the base 30, which are respectively a first optical fiber upper end 21, a first optical fiber lower end 22, a second optical fiber upper end 23, and a second optical fiber lower end 24.
The first light b1 passes through the first input optical channel, is reflected into the circulating optical channel by the first beam splitter 15, forms first circulating light b10 after being recycled for multiple times, and the first circulating light b10 is reflected into the first output optical channel by the second beam splitter 16 and is output.
In this embodiment, the specific optical path transmission path of the first light ray b1 is as follows: the first input optical fiber 1 emits first light b1 which sequentially passes through the first coupling lens 5, the first polarizer 6 reaches the first beam splitter 15, the first light b is coupled into the upper end 21 of the first optical fiber by the second coupling lens 6 after being reflected, the first light b is transmitted by the first optical fiber 19 and then is emitted from the lower end 22 of the first optical fiber, the first light b sequentially passes through the third coupling lens 7, the second beam splitter 16, the fourth beam splitter 26 and the third beam splitter 17, the first light b is coupled into the lower end 23 of the second optical fiber by the sixth coupling lens 10, the second light b is transmitted by the second optical fiber 20 and then is emitted from the upper end 24 of the second optical fiber, the first light b sequentially passes through the seventh coupling lens 11, the fourth beam splitter 18 and the third polarizer 25 to reach the first beam splitter 15, and the second light b is coupled into the upper end 21 of the first optical fiber by the second coupling lens 6, so that first circulating light b10 is formed after multiple cycles. Part of the circulating light is reflected by the second beam splitter 16, passes through the second polarizer 14, and is combined into the first receiving optical fiber 3 by the fourth coupling lens 8.
And a second light ray b2 passes through the second input optical channel and is reflected into the circulating optical channel through the fourth beam splitter (18), a second circulating light b20 is formed after multiple cycles, and the second circulating light b20 is reflected into the second output optical channel through the third beam splitter (17) and is output.
In this embodiment, the specific optical path transmission path of the second light ray b2 is as follows: the second input optical fiber 2 emits second light b2 which sequentially passes through the eighth coupling lens 12, the first polarizer 6 reaches the fourth beam splitter 18, is coupled into the upper end 24 of the second optical fiber by the seventh coupling lens 11 after being reflected, is transmitted by the second optical fiber 20 and then exits from the lower end 23 of the second optical fiber, sequentially passes through the sixth coupling lens 10, the third beam splitter 17, the fourth beam splitter 26 and the second beam splitter 16, is coupled into the lower end 22 of the first optical fiber by the third coupling lens 7, and exits from the upper end 21 of the first optical fiber after being transmitted by the first optical fiber 19, sequentially passes through the second coupling lens 6, the first beam splitter 15 and the second polarizer 25 to reach the fourth beam splitter 18, and is coupled into the upper end 24 of the second optical fiber by the seventh coupling lens 11 again, so that second circulating light b20 is formed after multiple cycles. Part of the recycled light is reflected by the third beam splitter 17, passes through the second polarizer 14, and is coupled into the second receiving fiber 4 by the fifth coupler 9.
The polarization directions of the first polarizer 13 and the third polarizer 25 are the same and are both a first polarization direction Z1, the polarization directions of the second polarizer 14 and the fourth polarizer 26 are the same and are a second polarization direction Z2, and the first polarization direction Z1 is orthogonal to the second polarization direction Z2. The first polarizer 13 is arranged between the first coupling lens 5, the eighth coupling lens 12 and the first beam splitter 15, the fourth beam splitter 18; the second polarizer 14 is arranged among the fourth coupling lens 8, the fifth coupling lens 9, the second beam splitter 16 and the third beam splitter 17; the third polarizer 25 is placed between the first beam splitter 15 and the fourth beam splitter 18; the fourth polarizer is placed between the second beam splitter 16 and the third beam splitter 17; the first polarizer 13, the second polarizer 14, the third polarizer 25 and the fourth polarizer 26 are obliquely arranged at an angle of 8 degrees with respect to the light path to reduce the back scattering light.
The first polarizer 13 is used for inhibiting light components in the second polarization direction Z2 in the first light ray b1 and the second light ray b2 emitted by the first emitting optical fiber 1 and the second emitting optical fiber 2 from entering the second coupling lens 6 and the seventh coupling lens 11, so as to reduce the sub-polarization state in the first circulating light b10 and the second circulating light b 20; the second polarizer 14 is configured to suppress light components of the first polarization direction Z1 in the first light ray b1 and the second light ray b2 received by the first receiving fiber 8 and the second receiving fiber 9 from entering the second coupling lens 6 and the seventh coupling lens 11, so as to suppress an influence of a sub-polarization state in the first circulating light b10 and the second circulating light b20 on the detection signal.
The third polarizer is used for suppressing the light component in the second polarization direction Z2 between the first beam splitter 15 and the fourth beam splitter 18; the fourth polarizer is used for suppressing the light component in the first polarization direction Z1 between the second beam splitter 16 and the third beam splitter 17; and finally, the secondary polarization state in the first recycled light b10 and the second recycled light b20 is suppressed, so that the influence of the secondary polarization state on the detection signal is reduced.
The first optical fiber 19 and the second optical fiber 20 have a function of maintaining a polarization state due to anisotropy, and two polarization axes, i.e., a first polarization axis P1 and a second polarization axis P2, exist in a cross section. Wherein the first polarization axis P1 of the first fiber upper end 21 is the same as the first polarization direction Z1, and the first polarization axis P1 of the first fiber lower end 22 is the same as the second polarization direction Z2; the second polarization axis P2 of the second fiber upper end 24 is the same as the first polarization direction Z1, and the second polarization axis P2 of the second fiber lower end 23 is the same as the second polarization direction Z2. At this time, the first polarization axis P1 of the first fiber upper end 21 is aligned with the second polarization axis P2 of the second fiber upper end 24, and the first polarization axis P1 of the first fiber lower end 22 is aligned with the second polarization axis P2 of the second fiber upper end 24. The lengths of the first optical fiber 19 and the second optical fiber 20 should be kept as the same as possible, and taking a 10m optical fiber as an example, the length difference is less than 3cm, so that the resonance peak corresponding to the sub-polarization state in the first circulating light b10 and the second circulating light b20 is far away from the resonance peak corresponding to the main polarization state, and polarization fluctuation noise caused by drift between the resonance peaks corresponding to the main and sub-polarization states due to external environment fluctuation is suppressed.
The first beam splitter 15 and the second beam splitter 16 are arranged at an angle of 45 degrees relative to the first light ray b1, reflect the first light ray b1 into the second coupling lens 6, and partially reflect the first circulating light b10 into the fourth coupling lens 8; the fourth beam splitter 18 and the third beam splitter 17 are inclined at 45 degrees relative to the second light ray b2, reflect the second light ray b2 into the seventh coupling lens 11, and partially reflect the second circulating light b20 into the fifth coupling lens 9; the coupling of the first light ray b1 and the second light ray b2 into and out of the resonant cavity is achieved.
The base 30 is formed by processing a silicon-based semiconductor process, has the characteristic of integration and miniaturization, and is suitable for mass production in the future. In this embodiment, the reflector and the polarizer may be etched or directly grown on the silicon-based substrate, and then the function is realized by coating, so as to realize integration of the resonant cavity and enhance the stability of the resonant cavity.
Further, the first beam splitter 15 and the second beam splitter 16 include a partially reflective coated surface and a high transmittance coated surface. The partial reflection coating surfaces of the first beam splitter 15 and the second beam splitter 16 are positioned at two sides which deviate from each other; the high-transmissivity film coating surfaces of the first beam splitter 15 and the second beam splitter 16 are positioned at two opposite sides. The reflectivity of the reflection coating surface is 1% -10%. The fourth beam splitter 18 and the third beam splitter 17 are coated similarly to the first beam splitter 15 and the second beam splitter 16.
As shown in fig. 2, a schematic diagram of the structure of the first optical fiber upper port and the second optical fiber upper port is provided. Since the first optical fiber 19 and the second optical fiber 20 have anisotropy, two polarization axes are respectively the first polarization axis Z1 and the second polarization axis Z2, and light is transmitted along the axial direction with the characteristic of keeping the polarization unchanged.
As shown in fig. 3, a schematic of the structures of the first polarizer 13 and the second polarizer 14 is given. The polarization direction of the first polarizer is a first polarization direction P1, and the polarization direction of the second polarizer is a second polarization direction P2. When the light beam passes through the first polarizer, the light component in the second polarization direction is filtered out, so that the amplitude of the secondary polarization state component in the circulating light is reduced; when the light beam passes through the second polarizer, the light component in the first polarization direction is filtered out, so that the influence of the secondary polarization state component in the circulating light on the main polarization state during detection is reduced.
As shown in fig. 4, spectral distributions of the first light ray b1 and the second light ray b2 received by the first receiving fiber 3 and the second receiving fiber 4 at different input optical frequencies are given. The optical fiber resonant cavity has a polarization fluctuation suppression characteristic, a secondary resonance peak (dotted line) corresponding to a secondary polarization state in a frequency spectrum curve is far away from a main resonance peak (solid line) corresponding to a main polarization state, and fluctuation between frequencies of the main resonance peak and the secondary resonance peak and amplitude of the secondary polarization peak are suppressed, so that polarization fluctuation noise caused by the secondary resonance peak can be reduced.
In conclusion, the invention adopts the space optical principle to realize the function of the optical fiber resonant cavity, avoids the traditional welding mode and is suitable for novel optical fibers, especially hollow optical fibers; the invention adopts specially set component parameters and a light path structure form, realizes a reciprocity light path for polarization fluctuation suppression, is beneficial to reducing the polarization fluctuation noise of the gyroscope and suppressing the common mode error of the gyroscope; the invention integrates the discrete components of the traditional resonant cavity on the substrate, thus being beneficial to packaging and miniaturization; the method has important significance for reducing the volume of the optical fiber resonant cavity, inhibiting the noise of the optical fiber resonant cavity and improving the signal to noise ratio of the gyroscope.
Claims (8)
1. An integrated polarization-suppressing fiber resonator is characterized by comprising a base (30), and a first input optical channel, a second input optical channel, a circulating optical channel, a first output optical channel and a second output optical channel which are integrated on the base (30);
the first input optical channel comprises a first emission optical fiber (1), a first coupling lens (5) and a first polarizer (13); the second input optical channel comprises a second input optical fiber (2), an eighth coupling lens (12) and a first polarizer (13);
the circulating light channel comprises a first beam splitter (15), a second coupling lens (6), a first optical fiber upper end (21) and a first optical fiber lower end (22) of a first optical fiber (19), a third coupling lens (7), a second beam splitter (16), a fourth polarizer (26), a third beam splitter (17), a sixth coupling lens (10), a second optical fiber lower end (23) and a second optical fiber upper end (24) of a second optical fiber (20), a seventh coupling lens (11), a fourth beam splitter (18) and a third polarizer (25) which are arranged in sequence;
the first output optical channel comprises a second polarizer (14), a fourth coupling lens (8) and a first receiving optical fiber (3) which are arranged in sequence; the second output optical channel comprises a second polarizer (14), a fifth coupling lens (9) and a second receiving optical fiber (4) which are arranged in sequence;
the first light b1 passes through a first input light channel, is reflected into a circulating light channel through a first beam splitter (15), forms first circulating light b10 after multiple cycles, and the first circulating light b10 is reflected into a first output light channel through a second beam splitter (16) and is output;
a second light ray b2 passes through a second input light channel, is reflected into the circulating light channel through a fourth beam splitter (18), forms second circulating light b20 after multiple cycles, and the second circulating light b20 is reflected into a second output light channel through a third beam splitter (17) and is output;
the polarizing directions of the first polarizer (13) and the third polarizer (25) are the same and are both a first polarization direction Z1; the polarization directions of the second polarizer 14 and the fourth polarizer 26 are the same, and are both the second polarization direction Z2; the first polarization direction Z1 is orthogonal to the second polarization direction Z2.
2. The integrated polarization-suppressing fiber resonator of claim 1, wherein the first fiber (19) and the second fiber (20) each comprise a first polarization axis P1 and a second polarization axis P2;
the first polarization axis P1 of the upper end (21) of the first optical fiber is the same as the first polarization direction Z1, and the first polarization axis P1 of the lower end (22) of the first optical fiber is the same as the second polarization direction Z2;
a second polarization axis P2 of the upper end (24) of the second optical fiber is the same as the first polarization direction Z1, and a second polarization axis P2 of the lower end (23) of the second optical fiber is the same as the second polarization direction Z2;
the first polarization axis P1 of the first fiber upper end (21) is aligned with the second polarization axis P2 of the second fiber upper end (24);
the first polarization axis P1 of the first fiber lower end (22) is aligned with the second polarization axis P2 of the second fiber lower end (23).
3. The resonator according to claim 1, wherein the first polarizer (13) is a polarizing plate, and the third polarizer (25) is a polarizing plate or a polarization splitting prism.
4. The resonator according to claim 1, wherein the first polarizer (13), the second polarizer (14), the third polarizer (25) and the fourth polarizer (26) are inclined at an angle of 8 ° to the optical path to reduce back-scattered light.
5. The integrated polarization-suppressing fiber resonator of claim 1, wherein the difference in length between the first fiber (19) and the second fiber (20) is less than three thousandths of the length of the first fiber (19) or the second fiber (20).
6. The integrated polarization suppressing fiber resonator of claim 1, wherein the first fiber (19) and the second fiber (20) are wound in a plurality of turns in a ring clockwise or counterclockwise.
7. The resonator according to claim 1, wherein the first beam splitter (15) and the second beam splitter (16) are tilted at 45 ° with respect to the first light ray b 1; the fourth beam splitter (18) and the third beam splitter (17) are inclined at 45 DEG with respect to the second light beam b 2.
8. An integrated polarization suppressing fiber resonator as claimed in claim 1, wherein the base (30) is formed of a silicon-based semiconductor wafer.
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| CN107037539A (en) * | 2017-05-12 | 2017-08-11 | 北京航空航天大学 | Single polarization transmission formula photonic crystal fiber resonator |
| CN110554464A (en) * | 2019-08-16 | 2019-12-10 | 中国航空工业集团公司西安飞行自动控制研究所 | Miniaturized single polarization fiber resonant cavity |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20130070252A1 (en) * | 2011-09-21 | 2013-03-21 | Honeywell International Inc. | Systems and methods for a hollow core resonant filter |
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| US4964131A (en) * | 1988-12-16 | 1990-10-16 | The Board Of Trustees Of The Leland Standford Junior University | Broadband optical fiber laser |
| CN101387519A (en) * | 2008-10-29 | 2009-03-18 | 北京航空航天大学 | Hollow photonic crystal fiber gyroscope |
| CN107037539A (en) * | 2017-05-12 | 2017-08-11 | 北京航空航天大学 | Single polarization transmission formula photonic crystal fiber resonator |
| CN110554464A (en) * | 2019-08-16 | 2019-12-10 | 中国航空工业集团公司西安飞行自动控制研究所 | Miniaturized single polarization fiber resonant cavity |
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