CN105953817A - Method for assembling core sensitive optical path of optical fiber gyro - Google Patents
Method for assembling core sensitive optical path of optical fiber gyro 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 invention provides a method for assembling a core sensitive optical path of an optical fiber gyro. When a Y waveguide chip is assembled with a 2*2 polarization maintaining coupler, a Y waveguide chip and an optical fiber ring, with use of the white light interference distributed measurement characteristics, alignment conditions of polarization maintaining optical fibers at input and output of a Y waveguide are measured; an assembly angle is determined by using amplitude values of characteristic peaks, the preparation processes of the optical fiber gyro and the Y waveguide are merged, screening, alignment and curing states of the device are adjusted, welding joint-free connection of the 2*2 polarization maintaining coupler, the Y waveguide and the optical fiber ring is achieved, and the integration level of the optical fiber gyro is improved. The method has the advantages of fewer core sensitive optical path welding joints of the optical fiber gyro, high integration degree, simple construction of a monitoring device, low crosstalk of Y waveguide input and output ports and the like, and is widely used in assembly of the core sensitive optical path of the optical fiber gyro.
Description
Technical field
The present invention relates to the assemble method of a kind of fiber optic measuring device, be specifically related to a kind of optical fibre gyro core sensitivity light path
Assemble method.
Background technology
Gyro is the basal core parts constituting inertial navigation system, and its level of development affects and governs the development of inertial navigation system.Optical fiber
Gyro has the features such as solid-state design, shock resistance, low in energy consumption, mean free error time length, and its application in inertial navigation system makes
The advantage of inertial navigation is more prominent.Owing to optical fibre gyro is to be made up of multiple waveguide devices, the compactness connected between each waveguide device
It is the most important thing affecting optical fiber gyroscope precision and reliability with seriality.
Optical coherence domain polarimetry technology (OCDP) is a kind of high accuracy distributed polarization coupling measurement technology, and it is based on width
Spectrum interference of light principle, carries out optical path compensation by scan-type optical interdferometer, it is achieved the interference between different polarization pattern, can be to partially
The shake locus of crosstalk, polarization coupled signal intensity carries out high-precision measurement and analysis, and then obtains optical polarization device
The important parameters such as extinction ratio, bat length.OCDP technology is as the detection side of the most promising a kind of distributed optical polarization performance
Method, is widely used in the field such as polarization maintaining optical fibre manufacture, the most countershaft, the device extinction ratio test of polarization maintaining optical fibre.Anti-with polarization time domain
Penetrate technology (POTDR), optical frequency domain reflection technology (OFDR), the detection of light coherent field reflection technology (OCDR) distributed
Method is compared with technology, and OCDP technology has simple in construction, high spatial resolution (5～10cm), wide-measuring range (measurement
Several kilometers of length), super high measurement sensitivity (coupling energy-80～-100dB), super big dynamic range (108～1010) etc. advantage.
Flashlight transport behavior in optic fibre light path the most directly and is truly described, so being particularly suitable for optical fiber device due to it
Part, assembly, and the high accuracy such as optical fibre gyro, superhigh precision interference-type optical fiber sensing light path test and assess.
Since optical fibre gyro is invented, its performance boost is made numerous studies by the most various research departments and mechanism.Optical fiber top
The research of spiral shell starts from 1976, Vali and R.W.Shorthill of the Utah university of the U.S. proposes the concept of optical fibre gyro first,
Utilizing optical fiber Sagnac interference effect, mainly the research to interference type optical fiber gyroscope (I-FOG), the emphasis in this stage exists
In improving its sensitivity and reducing the impact of error component.The eighties, start the performance of scale factor is studied, first with
The form of closed loop system constitutes optical fibre gyro system.1987, Nichola J of the U.S. et al. proposed a kind of lifting optical fibre gyro
The method (US4776700) of dynamic range and stability；2002, Bogdan Szafraniec et al. propose the first optical fiber and
Second optical fiber align angle is set and uses the method (US6801319B2) of depolariser；2005, Chung-Jen Chen
Etc. proposing the alignment methods (US2007/0121117A1) of a kind of fibre optic gyroscope, by using the way of two light sources, profit
With phase place change, fibre optic gyroscope is calibrated.
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., its product has covered the different accuracy requirement models such as Tactics-level, inert stage, strategy level
Enclose, be widely used in the fields such as Aeronautics and Astronautics.
For optical fibre gyro, play the usefulness of white light interference test system the most in an assembling process so that it is each is assembled
Process effectively quantifies to instruct, and has material impact for the final fiber optic gyroscope performance quality assembled.Rationally reduce waveguide
Between solder joint, develop the assemble method of a kind of optical fibre gyro core sensitivity light path, for improve optical fibre gyro overall performance have
Significance.
Summary of the invention
It is an object of the invention to provide one and there is compact, the integrated degree high of connection, can be used for optical fibre gyro core
The assemble method of the optical fibre gyro core sensitivity light path that sensitive light path assembles.
The object of the present invention is achieved like this:
(1) fiber optic loop tested and screen: by wide spectrum light source and the first end c1 connection of 2 × 2 polarization-maintaining couplers, optical fiber
First end s1 of ring and the 3rd end c3 alignment connection of 2 × 2 polarization-maintaining couplers, the second end s2 and the white light monitoring device of fiber optic loop
Alignment connects,
Open wide spectrum light source, regulate the polarization beat length device of white light monitoring device, obtain fiber optic loop by scanning movable mirror
Interference illustration, if the fiber optic loop overall crosstalk of display is less i.e. higher than 55dB and the existence without spuious peak in fiber optic loop interference illustration,
Then fiber optic loop is by screening, otherwise changes fiber optic loop and retests screening；
(2) under non-occluded state, the 3rd end c3 of 2 × 2 polarization-maintaining couplers is directed at the first port J1 of Y waveguide, Y
Second port J2 of waveguide is directed at the first end s1 of fiber optic loop, and the second end s2 of fiber optic loop connects white light monitoring device,
Regulate the polarization beat length device of white light monitoring device, obtain fiber optic loop interference illustration by scanning movable mirror, utilize
3rd end c3 of 2 × 2 polarization-maintaining couplers and the length of fiber optic loop find the characteristic peak of Y waveguide and the first port of Y waveguide respectively
The crosstalk peak of the second port J2 of J1 and Y waveguide；
Change the alignment angle of the 3rd end c3 of 2 × 2 polarization-maintaining couplers and the first port J1 of Y waveguide, and repeated measure optical fiber
Ring interference illustration, the crosstalk minimum at the first port J1 point of Y waveguide is i.e. higher than 50dB, the first port J1 point to Y waveguide
Carry out an adhesive curing；Change the alignment angle of the first end s1 of fiber optic loop and the second port J2 of Y waveguide, and repeated measure light
Fine ring interference illustration, makes the crosstalk minimum at the second port J2 point of Y waveguide i.e. higher than 50dB, the second port J2 to waveguide
Point carries out an adhesive curing；
(3) in closed state, the first end s1 of fiber optic loop is directed at the 3rd port J3 of Y waveguide, 2 × 2 polarization-maintaining couplers
Second end c2 connect white light monitoring device,
The polarization beat length device of regulation white light monitoring device, obtains fiber optic loop interference illustration by scanning movable mirror, utilizes
3rd end c3 of 2 × 2 polarization-maintaining couplers and the length of fiber optic loop find the crosstalk peak of the 3rd port J3 of Y waveguide,
The alignment angle of the second end s2 and the 3rd port J3 of Y waveguide of change fiber optic loop, repeated measure fiber optic loop interference illustration,
Make the crosstalk minimum at the 3rd port J3 point of Y waveguide i.e. higher than 50dB, the 3rd port J3 point of Y waveguide is carried out a glue admittedly
Change, complete assembling process.
White light monitoring device is made up of with processing means light path relevant apparatus and signal detection, and described light path relevant apparatus includes 1 × 2
Bonder, 1 × 2 bonder are connected with one end of polarization beat length device and the first port of three port circulators respectively, three port rings
3rd port of shape device connects collimating mirror, and collimating mirror connects movable mirror, the other end of polarization beat length device and three port rings
Second port of shape device connects two ports of 2 × 2 bonders respectively, and two other port of 2 × 2 bonders respectively connects a spy
Surveying device, 1 × 2 bonder is connected with the second end s2 of fiber optic loop through the polarizer.
Sweep limits S of the optical delay line being made up of collimator and movable mirror, the 3rd end c3 of 2 × 2 polarization-maintaining couplers
A length of l1, fiber optic loop length L, length l of tail optical fiber p1 of the polarizer2Between meet:
S>L+l1+l2
Further, the midpoint of light path sweep limits is chosen as the position of peak-peak of polarization crosstalk measurement data.
The invention provides the assemble method of a kind of optical fibre gyro core sensitivity light path, have connection compact, integrated degree is high
Feature, can be used for the assembling of optical fibre gyro core sensitivity light path.
The assemble method of the optical fibre gyro core sensitivity light path that the present invention proposes, including wide spectrum light source, 2 × 2 polarization-maintaining couplers and Y
Waveguide chip, Y waveguide chip and the assemble method of fiber optic loop, utilize white light interferometric principle, use wide spectrum light source the most right
Fiber optic loop carries out screening, realize the monitoring in real time and the solidification that are connected Y waveguide input and output with 2 × 2 polarization-maintaining couplers and fiber optic loop,
Finally connect the polarization laser light source of optical fibre gyro, reach the optical fibre gyro close-connected purpose of each connection member, greatly reduce even
The number of solder joint between relay part.Detailed process specifically includes that
(1) fiber optic loop tested and screen.It is sequentially connected with wide spectrum light source, 2 × 2 polarization-maintaining couplers, fiber optic loop, white light prison
Survey device.The c1 end of wide spectrum light source and 2 × 2 polarization-maintaining couplers connects, the s1 end of fiber optic loop and the c3 end of 2 × 2 polarization-maintaining couplers
Alignment connects, and is connected with white light monitoring device alignment by the s2 end of fiber optic loop.
Open wide spectrum light source, regulate polarization beat length device, by scanning movable mirror, obtain fiber optic loop interference illustration.If
The fiber optic loop overall crosstalk less (higher than 55dB) of display and the existence without spuious peak in fiber optic loop interference illustration, then fiber optic loop is led to
Cross screening；If being unsatisfactory for conditions above, then need to change fiber optic loop and retest screening.Select suitable fiber optic loop, carry out next
Step assembles.
(2) under non-occluded state, 2 × 2 polarization-maintaining couplers, Y waveguide, fiber optic loop are connected.Be sequentially connected with wide spectrum light source, 2 × 2
Polarization-maintaining coupler, Y waveguide, fiber optic loop, white light monitoring device, wherein the output c3 end of 2 × 2 polarization-maintaining couplers and Y waveguide
J1 port alignment, the J2 port of Y waveguide be directed at the s1 port of fiber optic loop, and the s2 port of fiber optic loop connects white light and monitors and fill
Put.
Regulation polarization beat length device, by scanning movable mirror, obtains fiber optic loop interference illustration.Utilize 2 × 2 guarantors coupling partially
The output c3 end of device and the length of fiber optic loop find the characteristic peak of Y waveguide and the crosstalk peak of J1 and J2 respectively.
By Y waveguide characteristic peak, it is screened, select the Y waveguide using crosstalk low；Change the defeated of 2 × 2 polarization-maintaining couplers
Go out the alignment angle of c3 end and Y waveguide input J1, and repeated measure interference illustration, make the minimum of the crosstalk at J1 point (be higher than
50dB), now J1 point is carried out an adhesive curing；Change the s1 end of fiber optic loop and the alignment angle of Y waveguide outfan J2, and
Repeated measure interference illustration, makes the crosstalk at J2 point minimum (higher than 50dB), now, J2 point is carried out an adhesive curing.
(3) in closed state, 2 × 2 polarization-maintaining couplers, Y waveguide, fiber optic loop are connected.Be sequentially connected with wide spectrum light source, 2 × 2
Polarization-maintaining coupler, Y waveguide, fiber optic loop, white light monitoring device, wherein the J3 port of the s1 port of fiber optic loop and Y waveguide with
Alignment, the c2 end of 2 × 2 polarization-maintaining couplers connects white light monitoring device.
Regulation polarization beat length device, by scanning movable mirror, obtains fiber optic loop interference illustration.Utilize 2 × 2 guarantors coupling partially
The output c3 end of device and the length of fiber optic loop, on the basis of step (3) is measured, find the crosstalk peak of J3.Change fiber optic loop
The alignment angle of s2 end and Y waveguide outfan J3, repeated measure interference illustration, make the minimum of the crosstalk at J3 point (be higher than
50dB), now, J3 point is carried out an adhesive curing, completes assembling process.
Sweep limits S of the optical delay line for being made up of collimator and movable mirror, the c3 end of 2 × 2 polarization-maintaining couplers
A length of l1, a length of L of fiber optic loop, a length of l of the tail optical fiber of the polarizer2, need to meet for sweep limits S:
S>L+l1+l2 (1)
Further, the midpoint of light path sweep limits is chosen as the position of peak-peak of polarization crosstalk measurement data as far as possible.
White light monitoring device is made up of with processing means light path relevant apparatus and signal detection.Light path relevant apparatus, by 1 × 2 coupling
Device, polarization beat length device, circulator, collimating mirror, movable mirror, 2 × 2 bonders, detector form.
The present invention is the measurement apparatus to optical coherence domain polarization test system (OCDP) based on white light interference theory.ODCP
Operation principle as it is shown in figure 1, as a example by the performance test of polarization maintaining optical fibre, wide spectrum light source the high stable wide range polarized light sent
The slow axis (during fast axle, principle is identical) of 301 polarization maintaining optical fibres 321 being injected into certain length.Due to not institute in polarizer
All in strict accordance with protecting off-axis transmission, nonideal defect point or connection can be there is in some light.Flashlight along slow axis transmit time,
When flashlight is transferred to defect point 311, a part of light energy in slow axis will be coupled in orthogonal fast axle, forms coupling
Light beam 303, remaining transmitting beam 302 is still transmitted along slow axis.There is linear birefrigence Δ n (such as: 5 × 10 in optical fiber-4),
Make the refractive index of slow axis more than fast axle refractive index, when the other end of optical fiber exports (transmission range is l), then transmit at slow axis
Transmission light 302 and transmission will there is an optical path difference Δ nl between the coupling light 303 of fast axle.Above-mentioned light beam passes through pad
Or rotary connecting joint 312, enters in light path correlator 330.In light path correlator 330, polarizing beam splitter mirror 332, fixing
Reflecting mirror 334, mobile mirror 338 form a Michelson optical interdferometer.Light beam 302 and 303 is through polarization beam splitting
Two parts in light path correlator 330 is divided into fixed arm and scan arm after mirror 332.In fixed arm, the light of transmission is through fixing anti-
Detector 339 is arrived after penetrating the reflection of mirror 334；In scan arm, the light of transmission also arrives at after the reflection of mobile mirror 338
Detector 339, two parts light converges in formation white light interference signal on detector 339, is received and converts optical signals to
The signal of telecommunication.This signal, after signal demodulating circuit 341 processes, is sent in metering computer 342；Metering computer 342 is another
Outer control mobile mirror 338 of being also responsible for realizes light path scanning.
Under the control of metering computer 342, the mobile mirror 338 of Michelson interferometer makes the optical path difference of interferometer two-arm
From Δ nl through zero passage, scanning is to-Δ nl, as shown in Figure 2:
(1) when optical path difference is equal to Δ nl, in scan arm, light 204 mates with light in fixed arm 201, then produce white light and do
Relating to signal, its peak amplitude isIt with defect point couple amplitude factor and the intensity of light source is directly proportional.
(2) when optical path difference is equal to 0, in scan arm and fixed arm, light 205 and light 201, light 206 and light 202 generation
Joining, then produce white light interference signal, its peak amplitude is Icoupling∝I0, it and the intensity of light source and direct ratio.
(3) when optical path difference is equal to Δ nl, in scan arm, light 207 mates with light in fixed arm 202, then produce white light and do
Relating to signal, its peak amplitude isIt with defect point couple amplitude factor and the intensity of light source is directly proportional.
Interference signal is processed, after normalization, is converted into dB value, by interference peaks with this amplitude and the detection of distance,
The important informations such as the position and the extinction ratio that i.e. can get polarization maintaining optical fibre shortcoming.
In optical fibre gyro assembling process, by the distributed measurement of crosstalk everywhere in light path, obtaining the cross talk conditions of junction
And it is adjusted solidification, obtain the fibre optic gyroscope of integration.
Compared with prior art, it is an advantage of the current invention that:
(1) assemble method of the optical fibre gyro core sensitivity light path that the present invention proposes, distribution is to fiber optic loop, Y waveguide, the inclined coupling of guarantor
Clutch is screened and is assembled, and can realize the integration connection of optical fibre gyro, the solder joint number being greatly reduced in light path.
(2) method monitored by white light interferometric light path, makes the crosstalk at junction point reach minimum, the assembling of optical fibre gyro
Method reduces the crosstalk interference to core sensitivity light path, improves the sensitivity of optical fibre gyro.
Accompanying drawing explanation
Fig. 1 is the optical principle schematic diagram of the distributed polarization interference single defect point measurement of optics；
Fig. 2 is the single polarization interference interference signal peak formed and the corresponding relation schematic diagram transmitting optical attenuation multiple；
Fig. 3 is fiber optic loop test and screening plant schematic diagram；
Fig. 4 is the measurement of 2 × 2 polarization-maintaining couplers and Y waveguide input port, a certain delivery outlet of Y waveguide and fiber optic loop and assembles signal
Figure；
Fig. 5 is the measurement of another delivery outlet of Y waveguide and fiber optic loop and assembles schematic diagram；
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.
Detailed description of the invention
For clearly demonstrating the assemble method of optical fibre gyro core sensitivity light path of the present invention, below in conjunction with embodiment and accompanying drawing to this
Bright it is described further, but should not limit 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 parameter thereof
As follows:
(1) centre wavelength 1550nm of wide spectrum light source 101, half spectral width are more than 45nm, fiber power bracket 0～2mW,
Extinction 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 decay is less than 1dB/km；
The operation wavelength of (4) 45 analyzers 105 is 1550nm, and extinction ratio is 30dB, and insertion loss is less than 1dB；
(5) 1 × 2 bonder 111 operation wavelengths are 1550nm, and insertion loss is less than 0.5dB, and splitting ratio is 50/50；
(6) operation wavelength of polarization beat length device 112 is 1550nm, and insertion loss is 0.5dB；
The operation wavelength of (7) three port circulators 113 is 1550nm, and insertion loss is 0.8dB, and isolation is more than 50dB；
(8) operation wavelength of self-focusing collimating lens 114 is 1550nm, it and removable optical mirror 115 (reflectance
Be more than 92%) between light path scanning distance about between 0～400mm change, average insertion loss is 3.0dB；
The operation wavelength of (9) 2 × 2 bonders 124 is 1550nm, and insertion loss is less than 0.5dB；
(10) light-sensitive material of detector 117,118 is InGaAs, and optical detection scope is 1100～1700nm, as used
The Nirvana of New Focus companyTMSeries 2017 type balanced detector.
The concrete assembling process of optical fibre gyro core sensitivity light path is as follows:
(1) fiber optic loop tested and screen.It is sequentially connected with wide spectrum light source 101,2 × 2 polarization-maintaining coupler 102, fiber optic loop
104, white light monitoring device 130.Wide spectrum light source 101 is connected with the c1 end of 2 × 2 polarization-maintaining couplers 102, fiber optic loop 104
The c3 end alignment of s1 end and 2 × 2 polarization-maintaining couplers 102 connects, by right with white light monitoring device 130 for the s2 end of fiber optic loop 104
Quasi-connection.
Open wide spectrum light source 101, regulate polarization beat length device 112, by scanning movable mirror 115, obtain fiber optic loop and do
Relate to collection of illustrative plates.If the fiber optic loop overall crosstalk less (higher than 55dB) of display and the existence without spuious peak in fiber optic loop interference illustration,
Then fiber optic loop is by screening；If being unsatisfactory for conditions above, then need to change fiber optic loop and retest screening.Select suitable fiber optic loop,
Carry out next step to assemble.
(2) under non-occluded state, 2 × 2 polarization-maintaining couplers 102, Y waveguide 103, fiber optic loop 104 are connected.It is sequentially connected with
Wide spectrum light source 101,2 × 2 polarization-maintaining coupler 102, Y waveguide 103, fiber optic loop 104, white light monitoring device 130, wherein 2 × 2
The output c3 end of polarization-maintaining coupler 102 is directed at the J1 port of Y waveguide 103, the J2 port of Y waveguide 103 and fiber optic loop
S1 port is directed at, and the s2 port of fiber optic loop connects white light monitoring device 130.
Regulation polarization beat length device 112, by scanning movable mirror 115, obtains fiber optic loop interference illustration.Utilize 2 × 2
The output c3 end of polarization-maintaining coupler 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.
By Y waveguide 103 characteristic peak, it is screened, select the Y waveguide 103 using crosstalk low；Change 2 × 2 inclined couplings of guarantor
The output c3 end of clutch 102 and the alignment angle of Y waveguide 103 input J1, and repeated measure interference illustration, make at J1 point
Crosstalk minimum (higher than 50dB), now J1 point is carried out an adhesive curing；Change s1 end and the Y waveguide of fiber optic loop 104
The alignment angle of 103 outfan J2, and repeated measure interference illustration, make the crosstalk at J2 point minimum (higher than 50dB), this
Time, J2 point is carried out an 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 with width
Spectrum light source 101,2 × 2 polarization-maintaining coupler 102, Y waveguide 103, fiber optic loop 104, white light monitoring device 130, wherein fiber optic loop
S1 port and Y waveguide 103 J3 port be directed at, the c2 end of 2 × 2 polarization-maintaining couplers 102 connects white light monitoring device 130.
Regulation polarization beat length device 112, by scanning movable mirror 115, obtains fiber optic loop interference illustration.Utilize 2 × 2
The output c3 end of polarization-maintaining coupler 102 and the length of fiber optic loop 104, on the basis of step 3 is measured, find the crosstalk of J3
Peak.Change the s2 end of fiber optic loop 104 and the alignment angle of Y waveguide 103 outfan J3, repeated measure interference illustration, make J3
Crosstalk at Dian is minimum (higher than 50dB), now, J3 point is carried out an adhesive curing, completes assembling process.
Sweep limits S of the optical delay line being made up of collimator 114 and movable mirror 115,2 × 2 polarization-maintaining couplers 102
The a length of l of c3 end1, a length of L of fiber optic loop, a length of l of the tail optical fiber p1 of the polarizer 1052, sweep limits S is needed
Meet:
S>L+l1+l2
Further, the midpoint of light path sweep limits is chosen as the position of peak-peak of polarization crosstalk measurement data as far as possible.
White light monitoring device 130 is made up of with processing means 120 light path relevant apparatus 110 and signal detection.Light path relevant apparatus
110 by 1 × 2 bonder 111, polarization beat length device 112, circulator 113, collimating mirror 114, movable mirror 115,2 × 2
Bonder 116, detector 117 and 118 form.
Claims (3)
1. an assemble method for optical fibre gyro core sensitivity light path, is characterized in that:
(1) fiber optic loop tested and screen: by wide spectrum light source and the first end c1 connection of 2 × 2 polarization-maintaining couplers, optical fiber
First end s1 of ring and the 3rd end c3 alignment connection of 2 × 2 polarization-maintaining couplers, the second end s2 and the white light monitoring device of fiber optic loop
Alignment connects,
Open wide spectrum light source, regulate the polarization beat length device of white light monitoring device, obtain fiber optic loop by scanning movable mirror
Interference illustration, if the fiber optic loop overall crosstalk of display is less i.e. higher than 55dB and the existence without spuious peak in fiber optic loop interference illustration,
Then fiber optic loop is by screening, otherwise changes fiber optic loop and retests screening；
(2) under non-occluded state, the 3rd end c3 of 2 × 2 polarization-maintaining couplers is directed at the first port J1 of Y waveguide, Y
Second port J2 of waveguide is directed at the first end s1 of fiber optic loop, and the second end s2 of fiber optic loop connects white light monitoring device,
Regulate the polarization beat length device of white light monitoring device, obtain fiber optic loop interference illustration by scanning movable mirror, utilize
3rd end c3 of 2 × 2 polarization-maintaining couplers and the length of fiber optic loop find the characteristic peak of Y waveguide and the first port of Y waveguide respectively
The crosstalk peak of the second port J2 of J1 and Y waveguide；
Change the alignment angle of the 3rd end c3 of 2 × 2 polarization-maintaining couplers and the first port J1 of Y waveguide, and repeated measure optical fiber
Ring interference illustration, the crosstalk minimum at the first port J1 point of Y waveguide is i.e. higher than 50dB, the first port J1 point to Y waveguide
Carry out an adhesive curing；Change the alignment angle of the first end s1 of fiber optic loop and the second port J2 of Y waveguide, and repeated measure light
Fine ring interference illustration, makes the crosstalk minimum at the second port J2 point of Y waveguide i.e. higher than 50dB, the second port J2 to waveguide
Point carries out an adhesive curing；
(3) in closed state, the first end s1 of fiber optic loop is directed at the 3rd port J3 of Y waveguide, 2 × 2 polarization-maintaining couplers
Second end c2 connect white light monitoring device,
The polarization beat length device of regulation white light monitoring device, obtains fiber optic loop interference illustration by scanning movable mirror, utilizes
3rd end c3 of 2 × 2 polarization-maintaining couplers and the length of fiber optic loop find the crosstalk peak of the 3rd port J3 of Y waveguide,
The alignment angle of the second end s2 and the 3rd port J3 of Y waveguide of change fiber optic loop, repeated measure fiber optic loop interference illustration,
Make the crosstalk minimum at the 3rd port J3 point of Y waveguide i.e. higher than 50dB, the 3rd port J3 point of Y waveguide is carried out a glue admittedly
Change, complete assembling process.
The assemble method of a kind of optical fibre gyro core sensitivity light path the most according to claim 1, is characterized in that: white light is monitored
Device is made up of with processing means light path relevant apparatus and signal detection, described light path relevant apparatus include 1 × 2 bonder, 1 × 2
Bonder is connected with one end of polarization beat length device and the first port of three port circulators respectively, the 3rd end of three port circulators
Mouth connects collimating mirror, and collimating mirror connects movable mirror, the other end of polarization beat length device and the second end of three port circulators
Mouth connects two ports of 2 × 2 bonders respectively, and two other port of 2 × 2 bonders respectively connects a detector, 1 × 2 coupling
Clutch is connected with the second end s2 of fiber optic loop through the polarizer.
The assemble method of a kind of optical fibre gyro core sensitivity light path the most according to claim 2, is characterized in that: by collimator
Sweep limits S of optical delay line, a length of l of the 3rd end c3 of 2 × 2 polarization-maintaining couplers with movable mirror composition1、
Fiber optic loop length L, length l of tail optical fiber p1 of the polarizer2Between meet:
S>L+l1+l2
Further, the midpoint of light path sweep limits is chosen as the position of peak-peak of polarization crosstalk measurement data.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| 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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