CN101706280A - Optical path structure for stimulated Brillouin optical fiber gyroscope - Google Patents
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Abstract
The invention discloses an optical path structure for a stimulated Brillouin optical fiber gyroscope. A light source emitted by an Erbium-doped narrow-linewidth optical fiber laser is split into two beams to transmit in different paths after passing through a coupler A. One beam of light enters a photonic crystal optical fiber resonant cavity after passing through an all-optical fiber acousto-optic frequency shifter, an optical fiber circulator A, a polarization controller A and a coupler B; and the other beam of light enters the photonic crystal optical fiber resonant cavity after passing through a variable attenuator, an optical fiber circulator B, a polarization controller B and the coupler B. The two beams of light are pump light transmitting anticlockwise and pump light transmitting clockwise respectively. As the wave field of the pump light in a photonic crystal optical fiber and an elastic sound wave field interact to generate stimulated Brillouin scattering, the stimulated Brillouin scattering can be described as periodical modulation of the refractive index of a medium which is caused by the nonlinear interaction performed between pump light waves and Stokes light waves through sound waves that are generated by the electrostriction of the pump light waves.
Description
Technical field
The present invention relates to a kind of fibre optic gyroscope, more particularly say, be meant a kind of light channel structure that is applicable to as fibre optic gyroscope.
Background technology
Fibre optic gyroscope is a kind of all solid state, real quiet gyro, can be divided into light channel structure and circuit structure according to the difference to process information, adopts a photodetector to realize being connected between light channel structure and the circuit structure.Fibre optic gyroscope is a kind ofly to have reliability height, life-span length, wide dynamic range, anti shock and vibration, volume is little, in light weight and is suitable for characteristics such as production in enormous quantities, can reach very high precision, has become the inertia type instrument of all kinds of inertia system first-selections.
Patent application publication number is CN 101067556A, open day is to disclose a kind of four-frequency differential Brillouin optical fiber gyroscope in 7 days November in 2007, this optical fibre gyro utilizes the offset frequency technology of pump light to solve the decision problem of frequency lock and sense of rotation, and utilizes the four-frequency differential detection technique to eliminate the error of being brought to system by the offset frequency instability.
Recently, because the development of optical fiber communication and Fibre Optical Sensor related-art technology, the breakthrough in succession of technology such as narrow-band light source, special optical fiber and device has brought opportunity for the breakthrough of novel stimulated Brillouin optical fiber gyroscope technology.Aspect the laser of narrowband light source of stimulated Brillouin optical fiber gyroscope.The He-Ne laser instrument of stimulated Brillouin optical fiber gyroscope original adoption wavelength 0.633 μ m is as light source.But He-Ne laser gain medium is a gas, and shock resistance and vibration ability are relatively poor.Nd:YAG (neodymium-doped yttrium-aluminum garnet) laser instrument that adopts wavelength 1.32 μ m is then also arranged as light source, but Nd:YAG laser instrument volume is bigger, not too is suitable for the practical application request of miniaturization gyro.
Summary of the invention
The objective of the invention is to propose a kind of light channel structure of excited Brillouin photonic crystal fiber gyro, this light channel structure utilizes the mechanism of the stimulated Brillouin scattering of narrow-linewidth laser signal in photonic crystal fiber, has realized the Sagnac effect of positive and negative two-way stimulated Brillouin scattering signal in the photonic crystal fiber annular resonant cavity; Adopt full optical fiber acousto-optic frequency shifters to obtain fixedly frequency deviation, thereby eliminated the frequency lock in the stimulated Brillouin optical fiber gyroscope, and can differentiate sense of rotation.
The present invention is a kind of light channel structure of excited Brillouin photonic crystal fiber gyro, and this light channel structure includes narrow linewidth erbium doped fiber laser, A coupling mechanism, acousto-optic frequency shifters, A fiber optical circulator, A Polarization Controller, B coupling mechanism, variable attenuator, B fiber optical circulator, B Polarization Controller, C coupling mechanism and photonic crystal fiber resonator cavity.
The tail optical fiber of narrow linewidth erbium doped fiber laser is connected with a port of A coupling mechanism;
The a port of A coupling mechanism is connected with the tail optical fiber of narrow linewidth erbium doped fiber laser, and the b port of A coupling mechanism is connected with going into of acousto-optic frequency shifters is fine, and the c port of A coupling mechanism is connected with going into of variable attenuator is fine;
The tail optical fiber of acousto-optic frequency shifters is connected with a port of A fiber optical circulator;
The a port of A fiber optical circulator is connected with the tail optical fiber of acousto-optic frequency shifters, and the b port of A fiber optical circulator is connected with an end of A Polarization Controller, and the c port of A fiber optical circulator is connected with a port of C coupling mechanism;
One end of A Polarization Controller is connected with the b port of A fiber optical circulator, and the other end of A Polarization Controller is connected with a port of B coupling mechanism;
The a port of B coupling mechanism is connected with the other end of A Polarization Controller, and the b port of B coupling mechanism is connected with the other end of B Polarization Controller, and the c port of B coupling mechanism and d port are connected on the two ends of high non-linear photon crystal optical fiber of photonic crystal fiber resonator cavity;
The fibre of going into of variable attenuator is connected with the c port of A coupling mechanism, and the tail optical fiber of variable attenuator is connected with a port of B fiber optical circulator;
The a port of B fiber optical circulator is connected with the tail optical fiber of variable attenuator, and the b port of B fiber optical circulator is connected with an end of B Polarization Controller, and the c port of B fiber optical circulator is connected with the b port of C coupling mechanism;
One end of B Polarization Controller is connected with the b port of B fiber optical circulator, and the other end of B Polarization Controller is connected with the b port of B coupling mechanism;
The a port of C coupling mechanism is connected with the c port of A fiber optical circulator, and the b port of C coupling mechanism is connected with the c port of B fiber optical circulator, and the c port of C coupling mechanism is connected with the signal input part of photodetector.
The light channel structure advantage of a kind of excited Brillouin photonic crystal fiber gyro of the present invention is:
This scheme is compared with stimulated Brillouin optical fiber gyroscope scheme before, has following technical advantage:
1) adopt high non-linear photon crystal optical fiber to constitute the fiber optic loop resonator cavity.Strengthen the stimulated Brillouin scattering effect on the one hand, made the sensitivity of optical fibre gyro improve; The minimizing of fiber optic loop length has reduced the influence to the fiber optic loop polarization state of extraneous heat and mechanical stress on the one hand, has improved the stability of optical fibre gyro.
2) adopt the narrow-linewidth single frequency single polarization optical fiber laser as light source, its live width is far smaller than the bandwidth 10MHz of brillouin gain less than 1kHz, therefore can obtain very high brillouin gain.In addition the narrow-linewidth single frequency single polarization optical fiber laser have also that output power is big, frequency stabilization, characteristics that degree of polarization is high, help obtaining stable excited Brillouin beat signal
3) adopt full optical fiber acousto-optic frequency shifters to obtain bigger fixedly frequency deviation, thereby eliminate the frequency lock in the stimulated Brillouin optical fiber gyroscope, and can differentiate sense of rotation.
4) on the signal Processing acousto-optic frequency shifters source driving signal is introduced in the signal processing as the reference signal.Can reduce the influence of the frequency jitter of acousto-optic frequency shifters on the one hand to the stimulated Brillouin optical fiber gyroscope precision; Also can carry out suitable modulation on the other hand, adopt advanced signal processing method to improve the measuring accuracy of stimulated Brillouin optical fiber gyroscope the acousto-optic frequency shifters drive signal.
5) in light path, introduced variable attenuator and Polarization Controller, can be simultaneously in experiment in the research fiber optic loop resonator cavity because Kerr effect that the pumping light power difference causes and pumping light polarization state change the influence to stimulated Brillouin optical fiber gyroscope.
6) coupling mechanism that constitutes the fiber optic loop resonator cavity adopts the splitting ratio variable coupler, the splitting ratio that can further study coupling mechanism in experiment is to excited Brillouin photonic crystal fiber gyro Effect on Performance, and the theoretical model of stimulated Brillouin optical fiber gyroscope is verified.
Description of drawings
Fig. 1 is the light channel structure figure of excited Brillouin photonic crystal fiber gyro of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Referring to shown in Figure 1, the present invention is a kind of light channel structure of excited Brillouin photonic crystal fiber gyro, and this light channel structure includes narrow linewidth erbium doped fiber laser 1, A coupling mechanism 11, acousto-optic frequency shifters 2, A fiber optical circulator 4A, A Polarization Controller 5A, B coupling mechanism 12, variable attenuator 3, B fiber optical circulator 4B, B Polarization Controller 5B, C coupling mechanism 13 and photonic crystal fiber resonator cavity 6.
The tail optical fiber of narrow linewidth erbium doped fiber laser 1 is connected with a port of A coupling mechanism 11; In the present invention, narrow linewidth erbium doped fiber laser 1 is as light source, and the centre wavelength of its output is 1549nm～1551nm, and live width is less than 1kHz.
The a port of A coupling mechanism 11 is connected with the tail optical fiber of narrow linewidth erbium doped fiber laser 1, and the b port of A coupling mechanism 11 is connected with going into of acousto-optic frequency shifters 2 is fine, and the c port of A coupling mechanism 11 is connected with going into of variable attenuator 3 is fine; In the present invention, the splitting ratio of A coupling mechanism 11 is 50: 50.
The fibre of going into of acousto-optic frequency shifters 2 (operation wavelength is that 1550nm ± 10nm, insertion loss are 2.0dB～2.5dB, and the shift frequency amount is 55MHz) is connected with the b port of A coupling mechanism 11, and the tail optical fiber of acousto-optic frequency shifters 2 is connected with a port of A fiber optical circulator 4A;
The a port of A fiber optical circulator 4A is connected with the tail optical fiber of acousto-optic frequency shifters 2, and the b port of A fiber optical circulator 4A is connected with the end of A Polarization Controller 5A, and the c port of A fiber optical circulator 4A is connected with a port of C coupling mechanism 13; In the present invention, the a port of A fiber optical circulator 4A to the insertion loss of b port is 0.3dB～0.8dB, b port to the insertion loss of c port is 0.3dB～0.8dB, b port to the isolation of a port is＞40dB, the c port is＞40dB that the cross-talk of a port and c port is＞45dB to the isolation of b port.
The end of A Polarization Controller 5A is connected with the b port of A fiber optical circulator 4A, and the other end of A Polarization Controller 5A is connected with a port of B coupling mechanism 12; In the present invention, the insertion loss of A Polarization Controller 5A is 0.1dB～0.3dB.
Being connected of the other end of a port of B coupling mechanism 12 and A Polarization Controller 5A, the b port of B coupling mechanism 12 is connected with the other end of B Polarization Controller 5B, and the c port of B coupling mechanism 12 and d port are connected on the two ends of high non-linear photon crystal optical fiber of photonic crystal fiber resonator cavity 6; Photonic crystal fiber resonator cavity 6 is that (the excited Brillouin gain coefficient is 5 * 10 with high non-linear photon crystal optical fiber
-10M/W～5 * 10
-9M/W) be wrapped on the skeleton of a cylinder or other shapes and form.In the present invention, the splitting ratio of B coupling mechanism 12 is 90: 10.So 10% of excited Brillouin laser is still stayed in the resonator cavity, 90% outputs to B coupling mechanism 12.After after a while, 10% excited Brillouin laser that remains in the resonator cavity arrives B coupling mechanism 12, so it 10% be limited in the resonator cavity, 90% outputs to B coupling mechanism 12.The excited Brillouin laser that is restricted like this forms in resonator cavity clockwise and the excited Brillouin laser that transmits counterclockwise.
The fibre of going into of variable attenuator 3 is connected with the c port of A coupling mechanism 11, and the tail optical fiber of variable attenuator 3 is connected with a port of B fiber optical circulator 4B; In the present invention, the variable attenuation scope of variable attenuator 3 is 0.1dB～6dB, and operation wavelength is 1550nm ± 10nm.
The a port of B fiber optical circulator 4B is connected with the tail optical fiber of variable attenuator 3, and the b port of B fiber optical circulator 4B is connected with the end of B Polarization Controller 5B, and the c port of B fiber optical circulator 4B is connected with the b port of C coupling mechanism 13; In the present invention, the a port of B fiber optical circulator 4B to the insertion loss of b port is 0.3dB～0.8dB, b port to the insertion loss of c port is 0.3dB～0.8dB, b port to the isolation of a port is＞40dB, the c port is＞40dB that the cross-talk of a port and c port is＞45dB to the isolation of b port.
The end of B Polarization Controller 5B is connected with the b port of B fiber optical circulator 4B, and the other end of B Polarization Controller 5B is connected with the b port of B coupling mechanism 12; In the present invention, the insertion loss of A Polarization Controller 5A is 0.1dB～0.3dB.
The a port of C coupling mechanism 13 is connected with the c port of A fiber optical circulator 4A, and the b port of C coupling mechanism 13 is connected with the c port of B fiber optical circulator 4B, and the c port of C coupling mechanism 13 is connected with the signal input part of photodetector; In the present invention, the splitting ratio of C coupling mechanism 13 is 50: 50.
Photodetector output electric signal is given circuit structure.In the present invention, circuit structure can be made up of pre-amplification circuit, filtering circuit, A/D converter, phase-modulator driving circuit, D/A converter and main control chip.
The optic path of the light channel structure of excited Brillouin photonic crystal fiber gyro of the present invention is:
Narrow linewidth erbium doped fiber laser 1 emitting laser is divided into two bundle laser behind A coupling mechanism 11, wherein beam of laser enters acousto-optic frequency shifters 2, and another Shu Jiguang enters variable attenuator 3;
The shift frequency laser of acousto-optic frequency shifters 2 outgoing in turn through a port of A fiber optical circulator 4A, A Polarization Controller 5A and B coupling mechanism 12 go into, the d port goes out, enter and form A pumping light 5A-1 in the photonic crystal fiber resonator cavity 6;
Go in turn, the c port goes out by the b port behind B fiber optical circulator 4B, B Polarization Controller 5B and B coupling mechanism 12 for laser after the decay of variable attenuator 3 outgoing, enters and form B pumping light 5B-1 in the photonic crystal fiber resonator cavity 6;
A pumping light 5A-1 produces reverse excited Brillouin gain in photonic crystal fiber resonator cavity 6, this gain has amplification to the A excited Brillouin laser 61 of clockwise transmission; In the present invention, the gain of the A excited Brillouin laser 61 after being exaggerated is up to 20dB～60dB.
90% of outgoing A excited Brillouin laser 61 enters in the C coupling mechanism 13 behind the b port of the d of B coupling mechanism 12 port, a port, A Polarization Controller 5A, A fiber optical circulator 4A, c port in turn from photonic crystal fiber resonator cavity 6;
90% of outgoing B excited Brillouin laser 62 enters in the C coupling mechanism 13 behind the b port of the c of B coupling mechanism 12 port, b port, B Polarization Controller 5B, B fiber optical circulator 4B, c port in turn from photonic crystal fiber resonator cavity 6;
10% of outgoing A excited Brillouin laser 61 continues circulation in photonic crystal fiber resonator cavity 6 from photonic crystal fiber resonator cavity 6, the excited Brillouin gain that is produced by A pumping light 5A-1 in cyclic process is amplified, and 90% A excited Brillouin laser is output once more then;
10% of outgoing B excited Brillouin laser 62 continues circulation in photonic crystal fiber resonator cavity 6 from photonic crystal fiber resonator cavity 6, the excited Brillouin gain that is produced by B pumping light 5B-1 in cyclic process is amplified, and 90% B excited Brillouin laser is output once more then.
In the present invention, in order to reduce the threshold power of stimulated Brillouin scattering in the photonic crystal fiber resonator cavity 6, adopted high non-linear photon crystal optical fiber to constitute the fiber optic loop resonator cavity.Because die face is long-pending very little, its brillouin gain is than high 1～2 order of magnitude of general single mode fiber, and this fiber optic loop resonator cavity can strengthen the stimulated Brillouin scattering effect on the one hand, makes the sensitivity of optical fibre gyro improve; Can reduce fiber optic loop length on the other hand, reduce the influence of extraneous heat and mechanical stress, improve the stability of optical fibre gyro the fiber optic loop polarization state.
Under the A pumping light 5A-1 situation identical with the frequency of B pumping light 5B-1, when photonic crystal fiber annular resonant cavity 6 is static, A excited Brillouin laser 61 is identical with the frequency of B excited Brillouin laser 62, when resonator cavity rotates with angular velocity Ω, because the Sagnac effect has produced frequency difference Δ f=f between them
Bcw-f
Bccw, f
HcwThe centre frequency of expression A excited Brillouin laser 61, f
BccwThe centre frequency of expression B excited Brillouin laser 62.When frequency difference Δ f is proportional to angular velocity Ω, satisfy
In the formula, S is the area that photonic crystal fiber annular resonant cavity 6 is surrounded, λ
0Be the centre wavelength of narrow linewidth erbium doped fiber laser 1, n is the refractive index of high non-linear photon crystal optical fiber, and L is the length of optical fiber in the photonic crystal fiber annular resonant cavity 6.
In order to eliminate hour at angular velocity Ω, the beat frequency lockout issue of stimulated Brillouin optical fiber gyroscope, the centre frequency that enters the two-beam (A pumping light 5A-1 and B pumping light 5B-1) in the photonic crystal fiber annular resonant cavity 6 is different, play the effect of offset frequency, not only solved lockout issue, and can judge the sense of rotation of gyro, enlarged the dynamic range of stimulated Brillouin optical fiber gyroscope.Because the employing of full optical fiber acousto-optic frequency shifters 2 finally through the A excited Brillouin laser 61 in the C coupling mechanism 13 back arrival photodetectors and the difference on the frequency of B excited Brillouin laser 62 is
ω is the shift frequency amount of acousto-optic frequency shifters 2.
A kind of light channel structure that is used for stimulated Brillouin optical fiber gyroscope of the present invention from the light source of narrow linewidth erbium doped fiber laser outgoing, is divided into the light of two bundles along the transmission of different paths behind the A coupling mechanism.Wherein a branch of light is gone in the photonic crystal fiber resonator cavity through full optical fiber acousto-optic frequency shifters, A fiber optical circulator, A Polarization Controller and B coupling mechanism are laggard; Another Shu Guang goes into the photonic crystal fiber resonator cavity through variable attenuator, B fiber optical circulator, B Polarization Controller and B coupling mechanism are laggard.Two-beam becomes the counterclockwise pumping light of transmission clockwise respectively, owing to pumping light wave field in the photonic crystal fiber and elasticity acoustic wavefield interaction generation stimulated Brillouin scattering.Elasticity acoustic wavefield in this stimulated Brillouin scattering process is under the effect of pumping light (narrow-linewidth laser), the photonic crystal fiber medium produces by electrostrictive effect, this is a kind of relevant acoustic wavefield, it and pumping light coupling produce relevant stimulated Brillouin scattering, and obtain the stokes light opposite with the pumping light direction.The stimulated Brillouin scattering process of this generation stokes light can be regarded as and bury in oblivion an incident photon, produces a back scattered photon and a phonon in the same way simultaneously.Therefore but the stimulated Brillouin scattering classical description is the non-linear interactions that pumping light wave, Stokes light wave are undertaken by sound wave, and the pumping light wave produces sound wave by electrostriction, causes the periodic modulation of medium refraction index then.
Claims (10)
1. the light channel structure of an excited Brillouin photonic crystal fiber gyro, described optical fibre gyro includes light channel structure, circuit structure and photodetector, photodetector is connected between light channel structure and the circuit structure, it is characterized in that: this light channel structure includes narrow linewidth erbium doped fiber laser (1), A coupling mechanism (11), acousto-optic frequency shifters (2), A fiber optical circulator (4A), A Polarization Controller (5A), B coupling mechanism (12), variable attenuator (3), B fiber optical circulator (4B), B Polarization Controller (5B), C coupling mechanism (13) and photonic crystal fiber resonator cavity (6);
Photonic crystal fiber resonator cavity (6) is to be 5 * 10 with the excited Brillouin gain coefficient
-10M/W～5 * 10
-9The high non-linear photon crystal optical fiber of m/W is wrapped on the skeleton of a cylinder or other shapes and forms;
The tail optical fiber of narrow linewidth erbium doped fiber laser (1) is connected with a port of A coupling mechanism (11); The b port of A coupling mechanism (11) is connected with going into of acousto-optic frequency shifters (2) is fine, and the c port of A coupling mechanism (11) is connected with going into of variable attenuator (3) is fine; The tail optical fiber of acousto-optic frequency shifters (2) is connected with a port of A fiber optical circulator (4A); The b port of A fiber optical circulator (4A) is connected with an end of A Polarization Controller (5A), and the c port of A fiber optical circulator (4A) is connected with a port of C coupling mechanism (13); The other end of A Polarization Controller (5A) is connected with a port of B coupling mechanism (12); The b port of B coupling mechanism (12) is connected with the other end of B Polarization Controller (5B), and the excited Brillouin gain coefficient that the c port of B coupling mechanism (12) and d port are connected photonic crystal fiber resonator cavity (6) is 5 * 10
-10M/W～5 * 10
-9On the two ends of the high non-linear photon crystal optical fiber of m/W; The fibre of going into of variable attenuator (3) is connected with the c port of A coupling mechanism (11), and the tail optical fiber of variable attenuator (3) is connected with a port of B fiber optical circulator (4B); The b port of B fiber optical circulator (4B) is connected with an end of B Polarization Controller (5B), and the c port of B fiber optical circulator (4B) is connected with the b port of C coupling mechanism (13); The other end of B Polarization Controller (5B) is connected with the b port of B coupling mechanism (12); The a port of C coupling mechanism (13) is connected with the c port of A fiber optical circulator (4A), and the b port of C coupling mechanism (13) is connected with the c port of B fiber optical circulator (4B), and the c port of C coupling mechanism (13) is connected with the signal input part of photodetector.
2. the light channel structure of excited Brillouin photonic crystal fiber gyro according to claim 1 is characterized in that the optic path of the light channel structure of excited Brillouin photonic crystal fiber gyro is:
Narrow linewidth erbium doped fiber laser (1) emitting laser is divided into two bundle laser behind A coupling mechanism (11), wherein beam of laser enters acousto-optic frequency shifters (2), and another Shu Jiguang enters variable attenuator (3);
The shift frequency laser of acousto-optic frequency shifters (2) outgoing in turn through a port of A fiber optical circulator (4A), A Polarization Controller (5A) and B coupling mechanism (12) go into, the d port goes out, enter and form A pumping light (5A-1) in the photonic crystal fiber resonator cavity (6);
Go in turn, the c port goes out by the b port behind B fiber optical circulator (4B), B Polarization Controller (5B) and B coupling mechanism (12) for laser after the decay of variable attenuator (3) outgoing, enters and form B pumping light (5B-1) in the photonic crystal fiber resonator cavity (6);
A pumping light (5A-1) produces reverse excited Brillouin gain in photonic crystal fiber resonator cavity (6), this gain has the effect that 20dB～60dB is amplified in gain to the A excited Brillouin laser (61) of clockwise transmission;
B pumping light (5B-1) produces reverse excited Brillouin gain in photonic crystal fiber resonator cavity (6), this gain has the effect that 20dB～60dB is amplified in gain to the B excited Brillouin laser 62 of counterclockwise transmission;
90% of outgoing A excited Brillouin laser (61) enters in the C coupling mechanism (13) behind the b port of the d port of B coupling mechanism (12), a port, A Polarization Controller (5A), A fiber optical circulator (4A), c port in turn from photonic crystal fiber resonator cavity (6);
90% of outgoing B excited Brillouin laser (62) enters in the C coupling mechanism (13) behind the b port of the c port of B coupling mechanism (12), b port, B Polarization Controller (5B), B fiber optical circulator (4B), c port in turn from photonic crystal fiber resonator cavity (6);
10% of outgoing A excited Brillouin laser (61) continues circulation in photonic crystal fiber resonator cavity (6) from photonic crystal fiber resonator cavity (6), the excited Brillouin gain that is produced by A pumping light (5A-1) in cyclic process is amplified, and 90% A excited Brillouin laser is output once more then;
10% of outgoing B excited Brillouin laser (62) continues circulation in photonic crystal fiber resonator cavity (6) from photonic crystal fiber resonator cavity (6), the excited Brillouin gain that is produced by B pumping light (5B-1) in cyclic process is amplified, and 90% B excited Brillouin laser is output once more then.
3. the light channel structure of excited Brillouin photonic crystal fiber gyro according to claim 2, it is characterized in that: under A pumping light (5A-1) situation identical with the frequency of B pumping light (5B-1), when photonic crystal fiber annular resonant cavity (6) is static, A excited Brillouin laser (61) is identical with the frequency of B excited Brillouin laser (62), when resonator cavity rotates with angular velocity Ω, because the Sagnac effect has produced frequency difference Δ f=f between them
Bcw-f
Bccw, f
BcwThe centre frequency of expression A excited Brillouin laser (61), f
BccwThe centre frequency of expression B excited Brillouin laser (62); When frequency difference Δ f is proportional to angular velocity Ω, satisfy
In the formula, S is the area that photonic crystal fiber annular resonant cavity (6) is surrounded, λ
0Be the centre wavelength of narrow linewidth erbium doped fiber laser (1), n is the refractive index of high non-linear photon crystal optical fiber, and L is the length of optical fiber in the photonic crystal fiber annular resonant cavity (6).
4. the light channel structure of excited Brillouin photonic crystal fiber gyro according to claim 1 and 2 is characterized in that: the difference on the frequency that exists between A excited Brillouin laser (61) in the photonic crystal fiber resonator cavity (6) and the B excited Brillouin laser (62) is
ω is the shift frequency amount of acousto-optic frequency shifters (2), and S is the area that photonic crystal fiber annular resonant cavity (6) is surrounded, λ
0Be the centre wavelength of narrow linewidth erbium doped fiber laser (1), n is the refractive index of high non-linear photon crystal optical fiber, and L is the length of optical fiber in the photonic crystal fiber annular resonant cavity (6).
5. the light channel structure of excited Brillouin photonic crystal fiber gyro according to claim 1 and 2 is characterized in that: the centre wavelength of narrow linewidth erbium doped fiber laser (1) output is 1549nm～1551nm, and live width is less than 1kHz.
6. the light channel structure of excited Brillouin photonic crystal fiber gyro according to claim 1 and 2 is characterized in that: the splitting ratio of A coupling mechanism (11) is 50: 50; The splitting ratio of B coupling mechanism (12) is 90: 10; The splitting ratio of C coupling mechanism (13) is 50: 50.
7. the light channel structure of excited Brillouin photonic crystal fiber gyro according to claim 1 and 2 is characterized in that: the operation wavelength of acousto-optic frequency shifters (2) is that 1550nm ± 10nm, insertion loss are 2.0dB～2.5dB, and the shift frequency amount is 55MHz.
8. the light channel structure of excited Brillouin photonic crystal fiber gyro according to claim 1 and 2, it is characterized in that: a port of A fiber optical circulator (4A) and B fiber optical circulator (4B) to the insertion loss of b port is 0.3dB～0.8dB, b port to the insertion loss of c port is 0.3dB～0.8dB, b port to the isolation of a port is＞40dB, the c port is＞40dB that the cross-talk of a port and c port is＞45dB to the isolation of b port.
9. the light channel structure of excited Brillouin photonic crystal fiber gyro according to claim 1 and 2 is characterized in that: the insertion loss of A Polarization Controller (5A) and B Polarization Controller (5B) is 0.1dB～0.3dB.
10. the light channel structure of excited Brillouin photonic crystal fiber gyro according to claim 1 and 2 is characterized in that: the variable attenuation scope of variable attenuator (3) is 0.1dB～6dB, and operation wavelength is 1550nm ± 10nm.
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| CN102636187A (en) * | 2012-04-19 | 2012-08-15 | 浙江大学 | Highly reciprocal resonant mode fiber-optic gyroscope detection device and method |
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