CN107289922B - Forward and reverse simultaneous measurement device of common-light-path fiber-optic gyroscope ring - Google Patents
Forward and reverse simultaneous measurement device of common-light-path fiber-optic gyroscope ring Download PDFInfo
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- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
- G01C19/726—Phase nulling gyrometers, i.e. compensating the Sagnac phase shift in a closed loop system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
- G01C19/725—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers using nxn optical couplers, e.g. 3x3 couplers
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Abstract
The invention belongs to the technical field of optical fiber measurement, and particularly relates to a forward and reverse simultaneous measurement device of a common-path optical fiber gyroscope ring. A forward and reverse simultaneous measurement device of a common-path fiber-optic gyroscope ring comprises a light source device, a test device 11, an optical path correlator 12 and a photoelectric signal conversion and signal recording device 13; the optical path correlator 12 includes a 1 st sixth port coupler 121, a 2 nd sixth port coupler 122, a 1 st collimating lens 123, a 2 nd collimating lens 124, and a scanning stage 125. The invention reduces the testing time of the fiber optic gyroscope ring polarization coupling measuring device, improves the measuring efficiency, eliminates the influence of environmental factors such as temperature and the like, and can accurately obtain the polarization coupling symmetry of the fiber optic gyroscope ring.
Description
Technical Field
The invention belongs to the technical field of optical fiber measurement, and particularly relates to a forward and reverse simultaneous measurement device of a common-path optical fiber gyroscope ring.
Background
In the interference type fiber optic gyroscope, the length of the polarization maintaining fiber adopted by the fiber optic gyroscope spiral ring is hundreds of meters to thousands of meters, so that the long-distance fiber needs to be wound into a multi-turn fiber optic gyroscope annular coil. The optical fiber gyro ring is not ideal (slight difference of refractive index distribution) in the manufacturing process of the polarization maintaining optical fiber, and is also influenced by external disturbance (such as microbending, torsion, compression, tension) and the like, and a plurality of defect points which can generate crosstalk are inevitably formed due to welding of an optical fiber fusion splicer, adhesion of different structures and the like. And the defect points can bring polarization crosstalk in the transmission process, and energy coupling introduced by the polarization crosstalk is shown as sensing errors of the fiber-optic gyroscope. The performance of the whole optical fiber gyroscope is directly determined by the quality of the process for winding the optical fiber gyroscope by using the spiral ring. Because the optical fiber gyroscope is based on the working mode of Sagnac interference, the optical path symmetry characteristic in the optical path structure of the optical fiber gyroscope is very important to keep. The forward transmission light and the reverse transmission light in the fiber-optic gyroscope ring can eliminate the error of the system only through the completely same optical path information, and the accurate navigation is carried out. The inconsistency of the optical path of the forward transmission light and the reverse transmission light in the fiber optic gyroscope ring becomes an important factor influencing the performance of the fiber optic gyroscope.
Some solutions have been proposed to reduce the nonreciprocal effect of the fiber optic gyroscope ring, and in particular to improve and evaluate the optical path symmetry of the fiber optic ring. In 2010, xi Yong Zhou, a sixteenth institute of the ninth institute of China aerospace science and technology group, discloses a symmetrical winding method for the midpoint of an optical fiber ring (Chinese patent application No. 201010013547.7). The invention obtains the midpoint of the optical fiber by calculation, winds the optical fiber according to a centrosymmetric method, can strictly ensure the midpoint symmetry of the optical fiber after winding the optical fiber ring, and better solves the temperature performance of the optical fiber ring. The fiber-optic gyroscope adopting the method can well reduce the full-temperature coefficient of the fiber-optic gyroscope. In 2012, Yandwig et al, Beijing aerospace university, disclosed a method for estimating polarization crosstalk and evaluating symmetry of optical fiber ring (Chinese patent application No. 201210359805.6). The method comprises the steps of obtaining the birefringence dispersion coefficient of the optical fiber to be tested by using a wavelength scanning method, establishing a polarization crosstalk estimation model, judging the central point of the optical fiber gyroscope spiral ring, obtaining polarization crosstalk data on the left side and the right side of the central point, and respectively determining the polarization crosstalk on the left side and the right side of the central point to analyze the symmetry of the optical fiber ring to be tested. In 2015, zhao et al, a research institute at forty-first of china electronic science and technology group, has invented a method for compensating the asymmetric length of an optical fiber ring for an optical fiber gyroscope (chinese patent application No. 201510282059.9), which measures the stress distribution of the optical fiber ring at different temperatures and calculates the stress integral difference to obtain the asymmetric length of the optical fiber ring.
The method for improving and evaluating the optical fiber ring only evaluates the optical path symmetry of the optical fiber ring by theoretical calculation and qualitative means, and needs to be further researched by quantitative and distributed technical approaches. An Optical Coherence Domain Polarization (OCDP) technology based on white light interference is gradually developed, and as a distributed polarization coupling measurement technology, the OCDP technology carries out optical path compensation through a scanning interferometer, and the position and the polarization coupling strength of defects inside a wound optical fiber ring can be reflected through interference signals. As early as 2011, Yangjun et al, Harbin engineering university, disclosed a device and method for improving polarization coupling measurement accuracy and symmetry of polarization maintaining fiber (Chinese patent application No. 201110118450.7). The optical fiber gyroscope ring to be measured is respectively measured in the forward direction and the reverse direction by adding the reversing mechanism with controllable light signals in the OCDP system. In 2016, Yangjun et al, Harbin engineering university, disclosed a symmetry evaluation device for spiral ring polarization coupling of fiber gyroscope (Chinese patent application No. 201610532372.8). The white light source used in the invention is averagely divided into two beams; respectively injecting the optical components with directivity into the forward direction and the reverse direction of the optical fiber gyro ring to be detected; then two sets of relatively independent interferometers sharing the same scanning platform scan; and finally, two polarization coupling measurement data with symmetrical scanning positions are obtained simultaneously by utilizing an optical coherence domain polarization measurement technology.
However, although the above-mentioned measurement method can realize forward and reverse measurements or evaluate the symmetry of the fiber-optic gyroscope, yandwig et al only measure an average value of polarization coupling between the left and right sections of the fiber-optic gyroscope ring, and have no way to realize distributed measurement; the controllable reversing mechanism of the Yangjun et al does not realize simultaneity, and cannot eliminate the influence caused by the inconsistency of environmental parameters such as temperature and the like when the time is inconsistent; although the directional optics method achieves simultaneous measurement in a strict sense, the interferometers used are relatively independent and the system consistency cannot be strictly controlled. Therefore, it is necessary to simplify the structure of the simultaneous measurement optical path, achieve strict consistency of the measurement optical path, and further provide real-time effective monitoring and necessary guidance for the selection of the optical fiber material and the improvement of the looping process.
The method is based on the optical coherence domain polarization measurement technology, and is used for simultaneously measuring the polarization coupling characteristics of forward/backward light transmission of the optical fiber gyro ring; a set of interference light paths are strictly shared to scan the optical fiber gyroscope spiral ring, so that the measurement inconsistency caused by different system structures is reduced to the maximum extent; the light source is averagely divided into two beams by adopting a coupler, and the two beams are respectively injected into two ports of the optical fiber gyro ring by utilizing an optical device with directivity. The device has simple structure and high integration level, and can reduce the influence of birefringence dispersion on polarization maintaining fiber measurement. The method helps to evaluate the symmetry performance of the optical fiber gyro ring and evaluate the inconsistency of the forward/reverse polarization coupling characteristics, and can be used for the manufacturing process optimization and the winding process improvement of the optical fiber gyro ring.
Disclosure of Invention
The invention aims to provide a forward and reverse simultaneous measurement device of a common-path fiber-optic gyroscope ring
The purpose of the invention is realized as follows:
a forward and reverse simultaneous measurement device of a common-path fiber-optic gyroscope loop comprises a light source device, a test device 11, an optical path correlator 12 and a photoelectric signal conversion and signal recording device 13:
the optical path correlator 12 comprises a 1 st sixth port coupler 121, a 2 nd sixth port coupler 122, a 1 st collimating lens 123, a 2 nd collimating lens 124 and a scanning stage 125;
the 1 st sixth port coupler 121 and the 2 nd sixth port coupler 122 have the same physical parameters; the 1 st port of each of the two six-port couplers is respectively connected with two output ends of the test device 11; 2 nd ports of the two six-port couplers are respectively connected with the correction light source 102 through two output ends of the 2 nd coupler 105; the 3 rd ports of the two six- port couplers 121 and 122 are respectively connected with the 1 st detector 126 and the 2 nd detector 127; the 4 th ports of the two six-port couplers are connected; the 5 th ports of the two six-port couplers are respectively connected with the 1 st collimating lens 123 and the 2 nd collimating lens 124; the 6 th port of each of the two six-port couplers is suspended;
the light input from the 1 st port 121a and the 2 nd port 121b of the 1 st sixth port coupler 121 is output from the 3 rd port 122c of the 2 nd sixth port coupler 122 via the optical path matching of the optical path correlator 12, and reaches the 2 nd detector 127; the light input from the 1 st port 122a and the 2 nd port 122b of the 2 nd sixth port coupler 122 passes through the optical path matching by the optical path correlator 12, is output from the 3 rd port 121c of the 1 st sixth port coupler 121, and reaches the 1 st detector 126.
The six-port coupler is a 3 × 3 six-port optical device, light energy is transmitted to three ports on the other side along three ports on one side of the six-port coupler, and vice versa, and when one port in the six ports is not needed, the six ports can be suspended and do not access the system.
The light source device comprises a wide-spectrum light source 101 and a correction light source 102; the broad spectrum light source 101 is equally split and injected into the testing device 11 through the 1 st coupler 103; the calibration light source 102 passes through the isolator 104 and then is injected into the optical path correlator 12 through the 2 nd coupler 105;
the test device 11 comprises a device under test 110, a 1 st circulator 113, a 2 nd circulator 114, a 1 st polarizer 111A, a 1 st analyzer 111B, a 2 nd polarizer 112A and a 2 nd analyzer 112B; the 1 st circulator 113 and the 2 nd circulator 114 have the same physical parameters; two ends of the device under test 110 are respectively connected with the 2 nd ports 32b of the 1 st circulator 113 and the 2 nd circulator 114; the 1 st polarizer 111A and the 2 nd polarizer 112A have the same physical parameters such as polarization angle, and the two are respectively connected with the 1 st port 31A of the 1 st circulator 113 and the 2 nd circulator 114; the 1 st analyzer 111B and the 2 nd analyzer 112B have the same physical parameters such as the analyzing angle, and the two are respectively connected with the 3 rd ports 31c of the 1 st circulator 113 and the 2 nd circulator 114;
the photoelectric signal conversion and signal recording device 13 comprises a data acquisition card 131 and a computer 132; the signals of the 1 st detector 126 and the 2 nd detector 127 are subjected to data acquisition by a data acquisition card 131, transmitted to a computer 132, and finally output polarization coupling signals.
The scanning stage 125 can accurately couple the light emitted from the 1 st collimating lens 123 into the 2 nd collimating lens 124.
The circulator 113, 114 or 32 is a three-port optical device; if the signal is input from the 1 st port 32a, the signal can be output only from the 2 nd port 32 b; and the signal is input from the 2 nd port 32b, and will be output from the 3 rd port 32 c; otherwise, it is not transportable.
The isolator is input from the 1 st port 33a and output from the 2 nd port 33 c; otherwise, transmission is not possible.
The invention has the beneficial effects that:
the invention strictly shares a set of interference light path to scan the optical fiber gyroscope ring, thereby reducing the measurement inconsistency introduced by different system structures to the maximum extent and simplifying the structure of the device; the forward/reverse simultaneous measurement of the polarization coupling information of the optical fiber ring can be realized in a strict sense, and the requirement on environmental factors is reduced; the testing time of the fiber optic gyroscope ring polarization coupling measuring device is reduced, the measuring efficiency is improved, the influence of environmental factors such as temperature is eliminated, and the polarization coupling symmetry of the fiber optic gyroscope ring can be accurately obtained.
Drawings
FIG. 1 is a schematic diagram of a common-path fiber ring polarization coupling symmetry evaluation device (circulator type);
FIG. 2 is a schematic diagram of another apparatus (coupler type) for evaluating polarization coupling symmetry of a common optical fiber ring;
FIG. 3 is a schematic diagram of a six-port coupler, circulator and isolator configuration;
FIG. 4 is a schematic diagram of an evaluation apparatus for polarization coupling of a typical fiber optic gyroscope;
FIG. 5 shows the polarization coupling signal output by the symmetry evaluation device for polarization coupling of the fiber optic gyroscope.
Detailed Description
The present invention is further illustrated with reference to the following examples and the accompanying drawings, but the scope of the present invention should not be limited thereto.
The invention provides a forward and reverse simultaneous measurement device of a common-path fiber optic gyroscope ring, which realizes strict quantitative evaluation on polarization coupling and symmetry of the fiber optic gyroscope ring and simultaneously measures the forward direction and the reverse direction of the fiber optic gyroscope ring. The device comprises light source devices 101 and 102, a testing device 11, an optical path correlator 12 and a photoelectric signal conversion and signal recording device 13, and is characterized in that:
(1) the optical path correlator 12 includes a 1 st sixth port coupler 121, a 2 nd sixth port coupler 122, a 1 st collimating lens 123, a 2 nd collimating lens 124, and a scanning stage 125.
(2) The 1 st sixth port coupler 121 and the 2 nd sixth port coupler 122 have the same physical parameters; the 1 st ports 121a and 122a of the two six- port couplers 121 and 122 are respectively connected with two output ends of the test device 11; 2 nd ports 121b and 122b of the two six- port couplers 121 and 122, respectively, are connected to the calibration light source 102 via two output terminals of the 2 nd coupler 105; the 3 rd ports 121c and 122c of the two six- port couplers 121 and 122 are respectively connected with the 1 st detector 126 and the 2 nd detector 127; the 4 th ports 121d and 122d of the two six- port couplers 121 and 122 are connected; the 5 th ports of the two six- port couplers 121 and 122 are respectively connected with the 1 st collimating lens 123 and the 2 nd collimating lens 124; the 6 th port of each of the two six- port couplers 121, 122 is floating.
(3) The light input from the 1 st port 121a and the 2 nd port 121b of the 1 st sixth port coupler 121 is output from the 3 rd port 122c of the 2 nd sixth port coupler 122 via the optical path matching of the optical path correlator 12, and reaches the 2 nd detector 127; the light input from the 1 st port 122a and the 2 nd port 122b of the 2 nd sixth port coupler 122 passes through the optical path matching by the optical path correlator 12, is output from the 3 rd port 121c of the 1 st sixth port coupler 121, and reaches the 1 st detector 126.
The six- port coupler 121, 122 or 31 is a 3 × 3 six-port optical device, and light can be transmitted to the other three ports 31d, 31e and 31f along the three ports 31a, 31b and 31c on one side, and vice versa.
The forward and reverse simultaneous measurement device of the common-path fiber optic gyroscope ring is characterized in that:
(1) the light source device comprises a wide-spectrum light source 101 and a correction light source 102; the broad spectrum light source 101 is equally split and injected into the testing device 11 through the 1 st coupler 103; the calibration light source 102 passes through the isolator 104 and then is injected into the optical path correlator 12 through the 2 nd coupler 105 for average splitting.
(2) The test device 11 comprises a device under test 110, a 1 st circulator 113, a 2 nd circulator 114, a 1 st polarizer 111A, a 1 st analyzer 111B, a 2 nd polarizer 112A and a 2 nd analyzer 112B; the 1 st circulator 113 and the 2 nd circulator 114 have the same physical parameters; two ends of the device under test 110 are respectively connected with the 2 nd ports 32b of the 1 st circulator 113 and the 2 nd circulator 114; the 1 st polarizer 111A and the 2 nd polarizer 112A have the same physical parameters such as polarization angle, and the two are respectively connected with the 1 st port 31A of the 1 st circulator 113 and the 2 nd circulator 114; the 1 st analyzer 111B and the 2 nd analyzer 112B have the same physical parameters such as the analyzing angle, and are respectively connected to the 3 rd ports 31c of the 1 st circulator 113 and the 2 nd circulator 114.
(3) The photoelectric signal conversion and signal recording device 13 comprises a data acquisition card 131 and a computer 132; the signals of the 1 st detector 126 and the 2 nd detector 127 are subjected to data acquisition by a data acquisition card 131, transmitted to a computer 132, and finally output polarization coupling signals 133A and 133B.
The scanning stage 125 is capable of accurately coupling the light emitted from the 1 st collimating lens 123 into the 2 nd collimating lens 124; and vice versa.
The circulator 113, 114 or 32 is a three-port optical device; if the signal is input from the 1 st port 32a, the signal can be output only from the 2 nd port 32 b; and the signal is input from the 2 nd port 32b, and will be output from the 3 rd port 32 c; otherwise, it is not transportable.
The isolator 104 or 33 is input from the 1 st port 33a and output from the 2 nd port 33 c; otherwise, transmission is not possible.
In general, a conventional fiber ring polarization coupling measurement apparatus is shown in fig. 4, wherein white light emitted from a broad spectrum light source 401 (e.g., S L D) passes through a polarizer 411A, a device under test 110 (e.g., a fiber ring), and an analyzer 411B in sequence, and is connected to an interferometer 42 (e.g., a mach zehnder interferometer, MZI), and a formed interference signal is connected to an interference signal detection and processing apparatus 43 through a photodetector 426, and a calibration light source 402 is used for displacement calibration of a displacement stage 425 in the interferometer 42, and data is acquired through a data acquisition card 431 and transmitted to a computer 432 to output a polarization coupling signal 443, and the measurement apparatus only includes single-direction information (forward or reverse information) of the device under test 110.
Example 1
The measuring device is shown in the attached figure 1, and the device parameters are selected as follows:
(1) the broadband light source 101 is an S L D light source, the center wavelength is 1550nm, the half-spectrum width is greater than 45nm, the fiber output power is greater than 5mW, and the extinction ratio is greater than 6 dB;
(2) the optical fiber device to be tested 110 is a panda type polarization maintaining optical fiber of 500 m;
(3) the working wavelengths of the 1 st polarizer 111A, the 1 st analyzer 111B and the 2 nd polarizer 112A and the 2 nd analyzer 112B are 1550nm, the extinction ratio is more than 20dB, and the insertion loss is less than 3 dB;
(4) the 1 st circulator 113 and the 2 nd circulator 114 are both three-port polarization-maintaining circulators, the return loss of which is more than 55dB and the insertion loss of which is less than 1 dB;
(5) the operating wavelengths of the six- port couplers 121 and 122 and the other optical fiber couplers 103 and 105 are 1310/1550nm, and the splitting ratio is 50: 50, insertion loss is less than 0.5 dB;
(6) the operating wavelength of the collimating lenses 123 and 124 is 1550 nm;
(7) the corner cube prism used in the displacement stage 125 is 90 deg., and the average reflectivity is greater than 95%.
Combining the above conditions, the measured polarization coupling signal is shown in fig. 5. Wherein, fig. 5(a) and 5(b) are respectively the forward measurement result and the reverse measurement result of the 500m fiber optic gyroscope. For simplicity, we each take the polarization coupling peak due to 3 typical defect points at the head and tail ends as an example for analysis. The characteristic peaks 51, 52, 53 in fig. 5 correspond to the characteristic peaks 51 ', 52 ', 53 ' in fig. 5, respectively; the characteristic peaks 54, 55, 56 in fig. 5 correspond to the characteristic peaks 54 ', 55 ', 56 ' in fig. 5, respectively. Accordingly, if comparing with the characteristic peak of the corresponding scanning optical path difference position in fig. 5, the symmetry information of the fiber gyroscope ring can be obtained.
Example 2
The measuring device is shown in figure 2, the two devices being substantially identical except that the testing device 21 is different from the testing device 11 of figure 1.
(1) The testing device 21 comprises a device under test 110, a forward coupler 213 and a backward coupler 214 connected with two ends of the device under test 110, a 1 st polarizer 111A and a 1 st analyzer 111B, and a 2 nd polarizer 112A and a 2 nd analyzer 112B;
(2) the 1 st coupler 213 and the 2 nd coupler 214 have the same physical parameters, and two ends of the device under test 110 are respectively connected with one ends of the forward coupler 213 and the reverse coupler 214; the 1 st polarizer 111A and the 2 nd polarizer 112A have the same physical parameters such as polarization angle, and are respectively connected with one input port of the 1 st coupler 213 and the 2 nd coupler 214; the 1 st analyzer 111B and the 2 nd analyzer 112B have the same physical parameters such as the analyzer angle, and are connected to the other input ports of the 1 st coupler 213 and the 2 nd coupler 214, respectively;
(3) the wide spectrum light source 101 is an S L D light source, which is connected with the 1 st isolator 201, the output end of the wide spectrum light source is injected into the testing device 21 through the 1 st coupler 103 average split light, and the two output ends of the testing device 21 passing through the 2 nd polarizer 112A and the 2 nd analyzer 112B are respectively connected with the 2 nd isolator 202 and the 3 rd isolator 203 and then input into the optical path correlator 12.
Device parameter selection was similar to application example 1, and by measurement, the same polarization-coupled signal as in fig. 5 was obtained.
The invention belongs to the technical field of optical fiber measurement, and particularly relates to a forward and reverse simultaneous measurement device of a common-path optical fiber gyroscope ring. The method is characterized in that the polarization coupling characteristics of forward/backward light transmission of the optical fiber gyro ring are simultaneously measured based on an optical coherence domain polarization measurement technology; a set of interference light paths are strictly shared to scan the optical fiber gyroscope spiral ring, so that the measurement inconsistency caused by different system structures is reduced to the maximum extent; the light source is averagely divided into two beams by adopting a coupler, and the two beams are respectively injected into two ports of the optical fiber gyro ring by utilizing an optical device with directivity. The device has simple structure and high integration level, and can reduce the influence of birefringence dispersion on polarization maintaining fiber measurement. The method helps to evaluate the symmetry performance of the optical fiber gyro ring and evaluate the inconsistency of the forward/reverse polarization coupling characteristics, and can be used for the manufacturing process optimization and the winding process improvement of the optical fiber gyro ring.
Claims (5)
1. The utility model provides a forward reverse simultaneous measurement device of fiber-optic gyroscope ring of sharing light path, includes light source device, testing arrangement (11), optical path correlator (12), photoelectric signal conversion and signal recording device (13), its characterized in that:
the optical path correlator (12) comprises a 1 st sixth port coupler (121), a 2 nd sixth port coupler (122), a 1 st collimating lens (123), a 2 nd collimating lens (124) and a scanning platform (125);
the 1 st sixth port coupler (121) and the 2 nd sixth port coupler (122) have the same physical parameters; the 1 st port of each of the two six-port couplers is respectively connected with two output ends of the test device (11); 2 nd ports of the two six-port couplers are respectively connected with two output ends of the correction light source (102) through the 2 nd coupler (105); the 3 rd ports of the two six-port couplers (121 and 122) are respectively connected with the 1 st detector (126) and the 2 nd detector (127); the 4 th ports of the two six-port couplers are connected; the 5 th ports of the two six-port couplers are respectively connected with a 1 st collimating lens (123) and a 2 nd collimating lens (124); the 6 th port of each of the two six-port couplers is suspended;
the light inputted from the 1 st port 121a and the 2 nd port 121b of the 1 st sixth port coupler 121 is output from the 3 rd port 122c of the 2 nd sixth port coupler 122 through the optical path matching of the optical path correlator 12 and reaches the 2 nd detector 127; the light inputted from the 1 st port 122a and the 2 nd port 122b of the 2 nd sixth port coupler 122 passes through the optical path matching of the optical path correlator 12, is outputted from the 3 rd port 121c of the 1 st sixth port coupler 121, and reaches the 1 st detector 126;
the light source device comprises a wide-spectrum light source (101) and a correction light source (102); the broad spectrum light source (101) is evenly split and injected into the testing device (11) through the 1 st coupler (103); the correction light source (102) passes through the isolator (104) and then is injected into the optical path correlator (12) through the 2 nd coupler (105) average split;
the testing device (11) comprises a device to be tested (110), a 1 st circulator (113), a 2 nd circulator (114), a 1 st polarizer (111A), a 1 st analyzer (111B), a 2 nd polarizer (112A) and a 2 nd analyzer (112B); the 1 st circulator (113) and the 2 nd circulator (114) have the same physical parameters; two ends of the device to be tested (110) are respectively connected with the 2 nd port (32b) of the 1 st circulator (113) and the 2 nd circulator (114); the 1 st polarizer (111A) and the 2 nd polarizer (112A) have the same physical parameters such as polarization angle and the like, and are respectively connected with the 1 st port (31A) of the 1 st circulator (113) and the 2 nd circulator (114); the 1 st analyzer (111B) and the 2 nd analyzer (112B) have the same physical parameters such as an analyzing angle and the like, and are respectively connected with the 3 rd port (31c) of the 1 st circulator (113) and the 2 nd circulator (114);
the photoelectric signal conversion and signal recording device (13) comprises a data acquisition card (131) and a computer (132); the two paths of signals of the 1 st detector (126) and the 2 nd detector (127) are subjected to data acquisition through a data acquisition card (131), transmitted to a computer (132) and finally output polarization coupling signals.
2. The device for simultaneously measuring forward and reverse directions of the common-path fiber-optic gyroscope ring as claimed in claim 1, wherein the six-port coupler is a 3 × 3 six-port optical device, light energy is transmitted to three ports on one side of the six-port coupler along three ports on the other side of the six-port coupler, and vice versa, and when one port of the six-port coupler is not needed, the six-port coupler can be suspended and not connected to a system.
3. The forward and reverse simultaneous measurement device of the common-path fiber-optic gyroscope ring according to claim 1, characterized in that: the scanning platform (125) can enable the light emitted by the 1 st collimating lens (123) to be accurately coupled into the 2 nd collimating lens (124).
4. The forward and reverse simultaneous measurement device of the common-path fiber-optic gyroscope ring according to claim 1, characterized in that: the circulator (113, 114 or 32) is a three-port optical device; when the signal is input from the 1 st port (32a), the signal can only be output from the 2 nd port (32 b); when the signal is input from the 2 nd port (32b), the signal is output from the 3 rd port (32 c); otherwise, it is not transportable.
5. The forward and reverse simultaneous measurement device of the common-path fiber-optic gyroscope ring according to claim 1, characterized in that: the isolator is input from a 1 st port (33a) and output from a 2 nd port (33 c); otherwise, transmission is not possible.
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| CN111912400B (en) * | 2020-07-30 | 2022-09-06 | 广东工业大学 | Polarization-maintaining optical fiber ring distributed polarization crosstalk bidirectional simultaneous measurement device and method |
| CN111964663B (en) * | 2020-07-30 | 2022-04-19 | 广东工业大学 | Optical fiber ring distributed polarization crosstalk bidirectional simultaneous measurement device and method |
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