CN105953817B - A kind of assemble method of optical fibre gyro core sensitivity light path - Google Patents
A kind of assemble method of optical fibre gyro core sensitivity light path Download PDFInfo
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- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
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Abstract
The present invention is to provide a kind of assemble methods of optical fibre gyro core sensitivity light path.When Y waveguide chip and 2 × 2 polarization-maintaining couplers, Y waveguide chip and fiber optic loop assemble, the characteristics of using white light interference distributed measurement, the alignment case of polarization maintaining optical fibre at Y waveguide input, output is measured, assembling angle is determined using the amplitude size of characteristic peak, optical fibre gyro is merged with the manufacturing process of Y waveguide, device is screened, is aligned and solid state is adjusted, the connection of no-welding-spot, improves the integrated horizontal of optical fibre gyro between 2 × 2 polarization-maintaining couplers of realization, Y waveguide and fiber optic loop.The present invention has the advantages that optical fibre gyro core sensitivity light path solder joint is few, integrated degree is high, monitoring device builds simple, Y waveguide input is low with delivery outlet crosstalk etc., is widely used in the assembling of optical fibre gyro core sensitivity light path.
Description
Technical field
The present invention relates to a kind of assemble methods of fiber optic measuring device, and in particular to quick to a kind of optical fibre gyro core
The assemble method on photosensitive road.
Background technology
Gyro is the basal core component for constituting inertial navigation system, and development level influences and restricts the hair of inertial navigation system
Exhibition.Optical fibre gyro has the characteristics that solid-state design, shock resistance, low in energy consumption, the mean free error time is long, in inertial navigation system
It is more protruded using the advantage of inertial navigation is made.Since optical fibre gyro is made of multiple waveguide devices, connected between each waveguide device
Compactness and continuity be influence optical fiber gyroscope precision and reliability the most important thing.
Optical coherence domain polarimetry technology (OCDP) is a kind of high-precision distributed polarization coupling measurement technology, it is based on
Wide spectrum optical principle of interference carries out optical path compensation by scan-type optical interdferometer, realizes the interference between different polarization pattern, can be right
The spatial position of polarization interference, polarization coupled signal strength carry out high-precision measurement and analysis, and then obtain optical polarizator
The extinction ratio of part claps the important parameters such as long.OCDP technologies are as a kind of inspection of very promising distributed optical polarization performance
Survey method is widely used in polarization maintaining optical fibre manufacture, polarization maintaining optical fibre accurately to fields such as axis, the tests of device extinction ratio.When with polarization
Relevant domain reflection technology (OCDR) the distributed detection method of domain reflection technology (POTDR), optical frequency domain reflection technology (OFDR), light
Compared with technology, there is OCDP technologies simple in structure, high spatial resolution (5~10cm), wide-measuring range (to measure several public affairs of length
In), superelevation measurement sensitivity (coupling energy -80~-100dB), super big dynamic range (108~1010) the advantages that.Most due to it
For directly and truly describe transport behavior of the signal light in optic fibre light path, so particularly suitable for optical fibre device, group
The high-precision such as part and optical fibre gyro, superhigh precision interference-type optical fiber sensing light path are tested and are assessed.
Since optical fibre gyro invention, numerous studies are made to its performance boost by various research departments and mechanism in the world.
The research of optical fibre gyro starts from 1976, and the Vali and R.W.Shorthill of the Utah universities in the U.S. are put forward for the first time optical fiber top
The concept of spiral shell utilizes optical fiber Sagnac interference effects, the mainly research to interference type optical fiber gyroscope (I-FOG), this stage
Focus on improve its sensitivity and reduce error component influence.Start to grind the performance of scale factor the eighties
Study carefully, is constituted optical fibre gyro system in the form of closed-loop system for the first time.1987, the Nichola J in the U.S. et al. proposed one kind
Promote the method (US4776700) of optical fiber gyroscope dynamic range and stability；2002, Bogdan Szafraniec et al. were carried
Go out and the first optical fiber and the second optical fiber align angle set and using the method (US6801319B2) of depolariser；2005,
Chung-Jen Chen etc. propose a kind of alignment methods of fibre optic gyroscope (US2007/0121117A1), by using two
The method of light source calibrates fibre optic gyroscope using phase change.
From precision optical fiber gyro since last century, the nineties began to use, technical research has than inertial navigation company earlier
Honeywell, Northrop, Ixspace etc., product have covered the different accuracies requirement models such as Tactics-level, inert stage, strategic grade
It encloses, is widely used in the fields such as Aeronautics and Astronautics.
For optical fibre gyro, the efficiency of white light interference test system how is played in an assembling process, makes it to each
A assembling process carries out effective quantization guidance, has great influence for the fiber optic gyroscope performance quality finally assembled.Rationally
The solder joint between waveguide is reduced, a kind of assemble method of optical fibre gyro core sensitivity light path is developed, for improving the whole of optical fibre gyro
Body performance is of great significance.
Invention content
The purpose of the present invention is to provide one kind having the characteristics that connection is compact, integrated degree is high, can be used for optical fiber top
The assemble method of the optical fibre gyro core sensitivity light path of spiral shell core sensitivity light path assembling.
The object of the present invention is achieved like this：
(1) fiber optic loop is tested and is screened：Wide spectrum light source is connect with the first end c1 of 2 × 2 polarization-maintaining couplers, light
The first end s1 of fine ring is directed at connection, the second end s2 of fiber optic loop and white light monitoring with the third end c3 of 2 × 2 polarization-maintaining couplers and fills
Alignment connection is set,
Wide spectrum light source is opened, the polarization beat length device of white light monitoring device is adjusted, is obtained by scanning movable mirror
Fiber optic loop interference illustration, if the fiber optic loop overall crosstalk shown in fiber optic loop interference illustration is smaller to be higher than 55dB and without spuious peak
Presence, then fiber optic loop by screening, otherwise replace fiber optic loop retest screening；
(2) under non-occluded state, the third end c3 of 2 × 2 polarization-maintaining couplers is aligned with the first port J1 of Y waveguide, Y waves
The second port J2 led is aligned with the first end s1 of fiber optic loop, the second end s2 connection white light monitoring devices of fiber optic loop,
It adjusts the polarization beat length device of white light monitoring device, obtain fiber optic loop interference pattern by scanning movable mirror
Spectrum, using the third end c3 of 2 × 2 polarization-maintaining couplers and the length of fiber optic loop find respectively Y waveguide characteristic peak and Y waveguide the
The crosstalk peak of the second port J2 of Single port J1 and Y waveguide；
Change the alignment angle of the third end c3 of 2 × 2 polarization-maintaining couplers and the first port J1 of Y waveguide, and duplicate measurements
Fiber optic loop interference illustration, the crosstalk minimum at the first port J1 points of Y waveguide is higher than 50dB, to the first port J1 of Y waveguide
Point carries out dispensing solidification；Change the alignment angle of the first end s1 of fiber optic loop and the second port J2 of Y waveguide, and duplicate measurements light
Fine ring interference illustration makes the crosstalk minimum at the second port J2 points of Y waveguide be higher than 50dB, to the second port J2 points of waveguide
Carry out an adhesive curing；
(3) in closed state, the first end s1 of fiber optic loop is aligned with the third port J3 of Y waveguide, the coupling of 2 × 2 polarization-maintainings
The second end c2 connection white light monitoring devices of device,
The polarization beat length device for adjusting white light monitoring device obtains fiber optic loop interference pattern by scanning movable mirror
Spectrum, the crosstalk peak of the third port J3 of Y waveguide is found using the third end c3 of 2 × 2 polarization-maintaining couplers and the length of fiber optic loop,
Change the alignment angle of the second end s2 of fiber optic loop and the third port J3 of Y waveguide, the interference of duplicate measurements fiber optic loop
Collection of illustrative plates makes the crosstalk minimum at the third port J3 points of Y waveguide be higher than 50dB, is carried out a little to the third port J3 points of Y waveguide
Assembling process is completed in adhesive curing.
White light monitoring device is made of light path relevant apparatus and signal detection with processing unit, the light path relevant apparatus packet
1 × 2 coupler, 1 × 2 coupler is included to connect with the first port of one end of polarization beat length device and three port circulators respectively,
The third port of three port circulators connects collimating mirror, and collimating mirror connects movable mirror, the other end of polarization beat length device
Two ports of 2 × 2 couplers, other two port of 2 × 2 couplers are separately connected with the second port of three port circulators
Respectively one detector of connection, second end s2 connection of 1 × 2 coupler through the polarizer and fiber optic loop.
The scanning range S for the optical delay line being made of collimator and movable mirror, the of 2 × 2 polarization-maintaining couplers
The length of three end c3 is l1, optical fiber ring length L, the polarizer tail optical fiber p1 length l2Between meet：
S>L+l1+l2
Also, the midpoint of light path scanning range is selected as the position of the peak-peak of polarization crosstalk measurement data.
The present invention provides a kind of assemble methods of optical fibre gyro core sensitivity light path, have and connect compact, integrated journey
The features such as high is spent, the assembling of optical fibre gyro core sensitivity light path is can be used for.
The assemble method of optical fibre gyro core sensitivity light path proposed by the present invention, including the coupling of wide spectrum light source, 2 × 2 polarization-maintainings
Device uses wide spectrum light source point with Y waveguide chip, the assemble method of Y waveguide chip and fiber optic loop using white light interferometric principle
It is other that fiber optic loop is screened, realizes the real-time monitoring being connect with 2 × 2 polarization-maintaining couplers and fiber optic loop to Y waveguide input and output
With solidification, the polarization laser light source of optical fibre gyro is finally connected, reaches the close-connected purpose of each connecting component of optical fibre gyro, greatly
The number of solder joint between big reduction connecting component.Detailed process includes mainly：
(1) fiber optic loop is tested and is screened.It is sequentially connected wide spectrum light source, 2 × 2 polarization-maintaining couplers, fiber optic loop, white light
Monitoring device.Wide spectrum light source is connect with the ends c1 of 2 × 2 polarization-maintaining couplers, the c3 at the ends s1 and 2 × 2 polarization-maintaining couplers of fiber optic loop
End alignment connection, connection is directed at by the ends s2 of fiber optic loop with white light monitoring device.
Wide spectrum light source is opened, polarization beat length device is adjusted, by scanning movable mirror, obtains fiber optic loop interference pattern
Spectrum.If the fiber optic loop overall crosstalk shown in fiber optic loop interference illustration smaller (be higher than 55dB) and without the presence at spuious peak, light
Fine ring passes through screening；If being unsatisfactory for conditions above, needs to change fiber optic loop and retest screening.Suitable fiber optic loop is selected, into
Row assembles in next step.
(2) under non-occluded state, 2 × 2 polarization-maintaining couplers of connection, Y waveguide, fiber optic loop.It is sequentially connected wide spectrum light source, 2
× 2 polarization-maintaining couplers, Y waveguide, fiber optic loop, white light monitoring device, wherein the output ends c3 of 2 × 2 polarization-maintaining couplers and Y waveguide
The ports J1 are aligned, and the ports J2 of Y waveguide are aligned with the ports s1 of fiber optic loop, and the ports s2 of fiber optic loop connect white light monitoring device.
Polarization beat length device is adjusted, by scanning movable mirror, obtains fiber optic loop interference illustration.Utilize 2 × 2 polarization-maintainings
The output ends c3 of coupler and the length of fiber optic loop find the characteristic peak of Y waveguide and the crosstalk peak of J1 and J2 respectively.
It is screened by Y waveguide characteristic peak, selection uses the low Y waveguide of crosstalk；Change 2 × 2 polarization-maintaining couplers
The output ends c3 and Y waveguide input terminal J1 alignment angle, and duplicate measurements interference illustration makes the minimum (height of the crosstalk at J1 points
In 50dB), dispensing solidification is carried out to J1 points at this time；The alignment angle for changing the ends s1 and Y waveguide output end J2 of fiber optic loop, lays equal stress on
Repetition measurement amount interference illustration keeps the crosstalk at J2 points minimum (being higher than 50dB), at this point, carrying out dispensing solidification to J2 points.
(3) in closed state, 2 × 2 polarization-maintaining couplers, Y waveguide, fiber optic loop are connected.It is sequentially connected wide spectrum light source, 2 × 2
Polarization-maintaining coupler, Y waveguide, fiber optic loop, white light monitoring device, the wherein ports s1 of fiber optic loop and the ports J3 of Y waveguide be aligned,
The ends c2 of 2 × 2 polarization-maintaining couplers connect white light monitoring device.
Polarization beat length device is adjusted, by scanning movable mirror, obtains fiber optic loop interference illustration.Utilize 2 × 2 polarization-maintainings
The length at the output ends c3 and fiber optic loop of coupler finds the crosstalk peak of J3 on the basis of step (3) measure.Change optical fiber
The alignment angle at the ends s2 and Y waveguide output end J3 of ring, duplicate measurements interference illustration make the crosstalk at J3 points is minimum (to be higher than
50dB), at this point, carrying out dispensing solidification to J3 points, assembling process is completed.
Scanning range S for the optical delay line being made of collimator and movable mirror, 2 × 2 polarization-maintaining couplers
The ends c3 length be l1, optical fiber ring length is L, and the length of the tail optical fiber of the polarizer is l2, scanning range S is needed to meet：
S>L+l1+l2 (1)
Also, the midpoint of light path scanning range is selected as the position of the peak-peak of polarization crosstalk measurement data as possible.
White light monitoring device is made of light path relevant apparatus and signal detection with processing unit.Light path relevant apparatus, by 1 ×
2 couplers, polarization beat length device, circulator, collimating mirror, movable mirror, 2 × 2 couplers, detector composition.
The present invention is the measuring device to the optical coherence domain polarization test system (OCDP) based on white light interference theory.
For the operation principle of ODCP as shown in Figure 1, by taking the performance test of polarization maintaining optical fibre as an example, the high stable wide range sent out by wide spectrum light source is inclined
The light 301 that shakes is injected into the slow axis of the polarization maintaining optical fibre 321 of certain length (when fast axle, principle is identical).Due in polarizer simultaneously
Not all light is transmitted in strict accordance with polarization-maintaining axis, can there is nonideal defect point or connection.Signal light is along slow axis
When transmission, when signal light is transferred to defect point 311, a part of light energy in slow axis will be coupled in orthogonal fast axle,
Coupling light beam 303 is formed, remaining transmitting beam 302 is still transmitted along slow axis.Optical fiber there are linear birefrigence Δ n (such as：
5×10-4), so that the refractive index of slow axis is more than fast axle refractive index, (transmission range l), then pass when the output of the other end of optical fiber
There will be an optical path difference Δ nl between the coupling light 303 of fast axle for defeated transmission light 302 and transmission in slow axis.Above-mentioned light beam is logical
Pad or rotary connecting joint 312 are crossed, into light path correlator 330.In light path correlator 330, polarizing beam splitter mirror
332, stationary mirror 334, mobile mirror 338 form a Michelson optical interdferometer.Light beam 302 and 303 is by inclined
It shakes and divides for two parts in fixed arm and scan arm in light path correlator 330 after beam splitter 332.The light transmitted in fixed arm passes through
Detector 339 is reached after the reflection of stationary mirror 334；The light transmitted in scan arm is after the reflection of mobile mirror 338
Also detector 339 is reached, two parts light converges on detector 339 formation white light interference signal, is received and by optical signal
Be converted to electric signal.This signal is sent into after the processing of signal demodulating circuit 341 in metering computer 342；Metering computer
In addition 342 will also be responsible for controlling the realization light path scanning of mobile mirror 338.
Under the control of metering computer 342, the mobile mirror 338 of Michelson interferometers makes interferometer two-arm
Optical path difference is from Δ nl through zero passage, and scanning is to-Δ nl, as shown in Figure 2：
(1) when optical path difference is equal to Δ nl, light 204 is matched with light in fixed arm 201 in scan arm, then generates white light
Interference signal, peak amplitude areThe coupling amplitude factor and the intensity of light source of it and defect point are at just
Than.
(2) when optical path difference is equal to 0, in scan arm and fixed arm, light 205 and light 201, light 206 and the generation of light 202
Match, then generates white light interference signal, peak amplitude Icoupling∝I0, it is with the intensity of light source and direct ratio.
(3) when optical path difference is equal to Δ nl, light 207 is matched with light in fixed arm 202 in scan arm, then generates white light
Interference signal, peak amplitude areThe coupling amplitude factor and the intensity of light source of it and defect point are at just
Than.
Interference signal is handled, dB values is converted into after normalization, by interference peaks with this amplitude and distance
Detection, you can obtain the important informations such as position and the extinction ratio of polarization maintaining optical fibre disadvantage.
In optical fibre gyro assembling process, by the distributed measurement to crosstalk everywhere in light path, the string of junction is obtained
It disturbs situation and is adjusted solidification to it, obtain integrated fibre optic gyroscope.
Compared with the prior art, the advantages of the present invention are as follows：
(1) assemble method of optical fibre gyro core sensitivity light path proposed by the present invention is distributed to fiber optic loop, Y waveguide, polarization-maintaining
Coupler is screened and is assembled the integration connection, it can be achieved that optical fibre gyro, greatly reduces the solder joint number in light path.
(2) method monitored by white light interferometric light path makes the crosstalk at tie point reach minimum, optical fibre gyro
Assemble method reduces interference of the crosstalk to the sensitive light path of core, improves the sensitivity of optical fibre gyro.
Description of the drawings
Fig. 1 is the optical principle schematic diagram that the single defect point of distributed polarization interference of optical device measures；
Fig. 2 is the correspondence schematic diagram at interference signal peak and transmission optical attenuation multiple that single polarization interference is formed；
Fig. 3 is optical fiber ring test and screening plant schematic diagram；
Fig. 4 is the measurement and assembling of 2 × 2 polarization-maintaining couplers and Y waveguide input port, a certain delivery outlet of Y waveguide and fiber optic loop
Schematic diagram；
Fig. 5 is measurement and the assembling schematic diagram of another delivery outlet of Y waveguide and fiber optic loop；
Fig. 6 is the assembling result schematic diagram of optical fibre gyro core sensitivity light path；
Fig. 7 is the assembling flow path figure of optical fibre gyro core sensitivity light path.
Specific implementation mode
To clearly demonstrate the assemble method of optical fibre gyro core sensitivity light path of the present invention, with reference to embodiment and attached drawing
The invention will be further described, but should not be limited the scope of the invention with this.
The assembling process of optical fibre gyro core sensitivity light path, as shown in Figure 4,5, 6.The selection of main photoelectric device and its ginseng
Number is as follows：
(1) the centre wavelength 1550nm of wide spectrum light source 101, half spectral width are more than 45nm, and fiber 0~2mW of power bracket disappears
Light ratio is more than 6dB；
The operation wavelength of (2) 2 × 2 polarization-maintaining couplers 102 is 1550nm, and insertion loss is less than 0.5dB；
(3) operation wavelength of fiber optic loop 104 is 1550nm, and fiber type is polarization maintaining optical fibre, and ring decaying is less than 1dB/km；
The operation wavelength of (4) 45 analyzers 105 is 1550nm, and extinction ratio 30dB, insertion loss is less than 1dB；
111 operation wavelength of (5) 1 × 2 coupler is 1550nm, and insertion loss is less than 0.5dB, splitting ratio 50/50；
(6) operation wavelength of polarization beat length device 112 is 1550nm, insertion loss 0.5dB；
The operation wavelength of (7) three port circulators 113 is 1550nm, and insertion loss 0.8dB, isolation is more than 50dB；
(8) operation wavelength of self-focusing collimation lens 114 is 1550nm, it is with 115 (reflectivity of removable optical mirror
Be 92% or more) between light path scanning distance about change between 0~400mm, average insertion loss 3.0dB；
The operation wavelength of (9) 2 × 2 couplers 124 is 1550nm, and insertion loss is less than 0.5dB；
(10) light-sensitive material of detector 117,118 is InGaAs, optical detection ranging from 1100~1700nm, is such as used
The Nirvana of New Focus companiesTMSerial 2017 type balanced detectors.
The specific assembling process of optical fibre gyro core sensitivity light path is as follows：
(1) fiber optic loop is tested and is screened.It is sequentially connected wide spectrum light source 101,2 × 2 polarization-maintaining couplers 102, optical fiber
Ring 104, white light monitoring device 130.Wide spectrum light source 101 is connect with the ends c1 of 2 × 2 polarization-maintaining couplers 102, the s1 of fiber optic loop 104
End is directed at connection with the ends c3 of 2 × 2 polarization-maintaining couplers 102, by the ends s2 of fiber optic loop 104 and 130 company of alignment of white light monitoring device
It connects.
Wide spectrum light source 101 is opened, polarization beat length device 112 is adjusted, by scanning movable mirror 115, obtains optical fiber
Ring interference illustration.If the fiber optic loop overall crosstalk shown in fiber optic loop interference illustration smaller (being higher than 55dB) and depositing without spuious peak
Then fiber optic loop passes through screening；If being unsatisfactory for conditions above, needs to change fiber optic loop and retest screening.Select suitable light
Fine ring carries out next step assembling.
(2) under non-occluded state, 2 × 2 polarization-maintaining couplers 102 of connection, Y waveguide 103, fiber optic loop 104.It is sequentially connected width
Light source 101,2 × 2 polarization-maintaining couplers 102, Y waveguide 103, fiber optic loop 104, white light monitoring device 130 are composed, wherein 2 × 2 polarization-maintaining couplings
The output ends c3 of clutch 102 are aligned with the ports J1 of Y waveguide 103, and the ports J2 of Y waveguide 103 are aligned with the ports s1 of fiber optic loop,
The ports the s2 connection white light monitoring device 130 of fiber optic loop.
Polarization beat length device 112 is adjusted, by scanning movable mirror 115, obtains fiber optic loop interference illustration.Utilize 2
The output ends c3 of × 2 polarization-maintaining couplers 102 and the length of fiber optic loop 104 find the characteristic peak of Y waveguide 103 with J1's and J2 respectively
Crosstalk peak.
It is screened by 103 characteristic peak of Y waveguide, selection uses the low Y waveguide 103 of crosstalk；Change 2 × 2 polarization-maintainings
The alignment angle at the output ends c3 and 103 input terminal J1 of Y waveguide of coupler 102, and duplicate measurements interference illustration, make at J1 points
Crosstalk is minimum (being higher than 50dB), carries out dispensing solidification to J1 points at this time；Change the ends s1 and 103 output end of Y waveguide of fiber optic loop 104
The alignment angle of J2, and duplicate measurements interference illustration keep the crosstalk at J2 points minimum (being higher than 50dB), at this point, being carried out to J2 points
Point adhesive curing.
(3) in closed state, 2 × 2 polarization-maintaining couplers 102, Y waveguide 103, fiber optic loop 104 are connected.It is sequentially connected wide range
Light source 101,2 × 2 polarization-maintaining couplers 102, Y waveguide 103, fiber optic loop 104, white light monitoring device 130, the wherein ends s1 of fiber optic loop
Mouthful with the ports J3 of Y waveguide 103 be aligned, the ends c2 of 2 × 2 polarization-maintaining couplers 102 connect white light monitoring device 130.
Polarization beat length device 112 is adjusted, by scanning movable mirror 115, obtains fiber optic loop interference illustration.Utilize 2
The length at the output ends c3 and fiber optic loop 104 of × 2 polarization-maintaining couplers 102 finds the crosstalk of J3 on the basis of step 3 measures
Peak.Change the alignment angle at the ends s2 and 103 output end J3 of Y waveguide of fiber optic loop 104, duplicate measurements interference illustration makes at J3 points
Crosstalk minimum (being higher than 50dB) complete assembling process at this point, carrying out dispensing solidification to J3 points.
By the scanning range S for the optical delay line that collimator 114 and movable mirror 115 form, the coupling of 2 × 2 polarization-maintainings
The length at the ends c3 of device 102 is l1, optical fiber ring length is L, and the length of the tail optical fiber p1 of the polarizer 105 is l2, for scanning range S
It needs to meet：
S>L+l1+l2
Also, the midpoint of light path scanning range is selected as the position of the peak-peak of polarization crosstalk measurement data as possible.
White light monitoring device 130 is made of light path relevant apparatus 110 and signal detection with processing unit 120.Light path is related
Device 110 is by 1 × 2 coupler 111, polarization beat length device 112, circulator 113, collimating mirror 114, movable mirror 115,2
× 2 couplers 116, detector 117 and 118 form.
Claims (2)
1. a kind of assemble method of optical fibre gyro core sensitivity light path, it is characterized in that：
(1) fiber optic loop is tested and is screened：Wide spectrum light source is connect with the first end (c1) of 2 × 2 polarization-maintaining couplers, optical fiber
The first end (s1) of ring be aligned with the third end (c3) of 2 × 2 polarization-maintaining couplers connection, fiber optic loop second end (s2) through the polarizer
Connection is directed at white light monitoring device, the white light monitoring device is by light path relevant apparatus and signal detection and processing unit group
At light path relevant apparatus is by 1 × 2 coupler, polarization beat length device, circulator, collimating mirror, movable mirror, 2 × 2 couplings
Device and detector composition, 1 × 2 coupler connect with the first port of one end of polarization beat length device and three port circulators respectively
Connect, the third ports of three port circulators connects collimating mirror, and collimating mirror connects movable mirror, polarization beat length device it is another
The second port of end and three port circulators is separately connected two ports of 2 × 2 couplers, other two end of 2 × 2 couplers
Mouth respectively connects a detector；
Wide spectrum light source is opened, the polarization beat length device of white light monitoring device is adjusted, obtains optical fiber by scanning movable mirror
Ring interference illustration, if the fiber optic loop overall crosstalk shown in fiber optic loop interference illustration is smaller to be higher than 55dB and depositing without spuious peak
, then fiber optic loop by screening, otherwise replace fiber optic loop retest screening；
(2) under non-occluded state, the third end (c3) of 2 × 2 polarization-maintaining couplers is aligned with the first port (J1) of Y waveguide, Y waves
The second port (J2) led is aligned with the first end (s1) of fiber optic loop, and the second end (s2) of fiber optic loop is through polarizer connection white light prison
Device is surveyed,
It adjusts the polarization beat length device of white light monitoring device, obtain fiber optic loop interference illustration by scanning movable mirror, profit
With the length at the third end (c3) of 2 × 2 polarization-maintaining couplers and fiber optic loop find respectively Y waveguide characteristic peak and Y waveguide first
The crosstalk peak of the second port (J2) of port (J1) and Y waveguide；
Change the alignment angle at the third end (c3) of 2 × 2 polarization-maintaining couplers and the first port (J1) of Y waveguide, and duplicate measurements
Fiber optic loop interference illustration, the crosstalk minimum at first port (J1) point of Y waveguide is higher than 50dB, to the first port of Y waveguide
(J1) point carries out dispensing solidification；The alignment angle for changing the first end (s1) of fiber optic loop and the second port (J2) of Y waveguide, lays equal stress on
Repetition measurement amount fiber optic loop interference illustration makes crosstalk minimum at second port (J2) point of Y waveguide be higher than 50dB, to the of waveguide
Two-port netwerk (J2) point carries out dispensing solidification；
(3) in closed state, the first end (s1) of fiber optic loop is aligned with the third port (J3) of Y waveguide, the coupling of 2 × 2 polarization-maintainings
The second end (c2) of device connects white light monitoring device,
The polarization beat length device for adjusting white light monitoring device obtains fiber optic loop interference illustration, profit by scanning movable mirror
The crosstalk peak of the third port (J3) of Y waveguide is found with the length at the third end (c3) of 2 × 2 polarization-maintaining couplers and fiber optic loop,
Change the alignment angle of the second end (s2) of fiber optic loop and the third port (J3) of Y waveguide, the interference of duplicate measurements fiber optic loop
Collection of illustrative plates makes the crosstalk minimum at third port (J3) point of Y waveguide be higher than 50dB, is clicked through to the third port (J3) of Y waveguide
Row point adhesive curing, completes assembling process.
2. a kind of assemble method of optical fibre gyro core sensitivity light path according to claim 1, it is characterized in that：By collimator
Length with the third end (c3) of the scanning range S of optical delay line of movable mirror composition, 2 × 2 polarization-maintaining couplers is
l1, optical fiber ring length L, the polarizer the first tail optical fiber (p1) length l2Between meet：
S>L+l1+l2
Also, the midpoint of light path scanning range is selected as the position of the peak-peak of polarization crosstalk measurement data.
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| CN107289922B (en) * | 2017-01-23 | 2020-07-28 | 哈尔滨工程大学 | Forward and reverse simultaneous measurement device of common-light-path fiber-optic gyroscope ring |
| CN108680151B (en) * | 2018-06-21 | 2023-12-08 | 中国科学院西安光学精密机械研究所 | Open-loop fiber optic gyroscope |
| CN112484752B (en) * | 2020-11-10 | 2023-07-21 | 广东工业大学 | Device and method for testing reflection characteristics of large dynamic range fiber optic gyroscope |
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| CN102706538B (en) * | 2012-05-29 | 2014-10-15 | 天津大学 | Polarization maintaining optical fiber extinction-ratio self-adaptive demodulation method |
| CN102889979B (en) * | 2012-09-24 | 2015-03-25 | 北京航空航天大学 | Polarization crosstalk estimation and symmetry estimation method of optical fiber ring |
| CN105992934B (en) * | 2014-02-21 | 2020-09-22 | Abb电网瑞士股份公司 | Interferometric sensor |
| CN103940588B (en) * | 2014-03-21 | 2016-06-29 | 哈尔滨工程大学 | The suppressing method of the polarization decay restraining device that optically-based cross polarization is measured |
| CN204405294U (en) * | 2014-10-11 | 2015-06-17 | 哈尔滨工程大学 | A kind of dual channel optical performance proving installation simultaneously of Y waveguide device |
| CN105043718B (en) * | 2015-04-30 | 2017-11-21 | 哈尔滨工程大学 | A kind of Noise Suppression Device and suppressing method of the measurement of optical polarization device distributed polarization interference |
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