CN104792503B - A kind of device of optical polarization device distribution crosstalk measurement sensitivity enhancing - Google Patents
A kind of device of optical polarization device distribution crosstalk measurement sensitivity enhancing Download PDFInfo
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Abstract
The purpose of the present invention is to provide a kind of signal-to-noise ratio of enhancing measuring signal, the sensitivity and dynamic range that polarization interference measures are improved, the device of the optical polarization device distribution crosstalk measurement sensitivity enhancing of the high-acruracy survey and analysis for optical device polarization property.A kind of device of optical polarization device distribution crosstalk measurement sensitivity enhancing, including the demodulation of wide spectrum light source, the polarizer, polarizer to be measured, the first fiber rotation connector, the second fiber rotation connector, light path and signal sensor, signal detection and processing unit.The present invention is on the basis of single correlator measuring limit, using the structure of two branch synchro measure of light path correlator, it is detached using polarization beam apparatus by the signal light on two polarization principal axis is transmitted, linear superposition after two-way interference signal synchronous scanning is promoted that will measure signal-to-noise ratioTimes while, and the absolute intensity of distributed crosstalk can be measured, greatly improve measuring system sensitivity and accuracy.
Description
Technical field
Present invention design belongs to technical field of optical fiber measurement, and in particular to is surveyed to a kind of optical polarization device distribution crosstalk
Measure the device of sensitivity enhancing.
Background technology
Polarization optics are the important components for constituting high-precision optical measurement and sensor-based system, at present optical device
The present situation that performance test falls behind with evaluation method and device seriously hinders the development of high-precision optical measurement and sensor-based system.
Such as：The core devices of high-precision optical fiber gyro --- the chip extinction ratio of lithium niobate integrated waveguide modulator (being commonly called as Y waveguide)
Have reached 80dB or more；And common polarization property detecting instrument --- extinction ratio tester, common detection resolution exist
50dB or so is (according to energy definition, as 105), resolution ratio is highest to develop Model 4810 for dBm Optics companies of the U.S.
Type polarization extinction ratio, measuring instrument measuring limit also only have 72dB.
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.Such as with other：
Polarize relevant domain reflection technology (OCDR) distributed inspection of time domain reflection technology (POTDR), optical frequency domain reflection technology (OFDR), light
Compared with technology, there is OCDP technologies survey method simple in structure, high spatial resolution (5~10cm), wide-measuring range (to measure length
Spend several kilometers), superelevation measurement sensitivity (coupling energy -80~-100dB), super big dynamic range (108~1010) the advantages that, it is non-
Often it is hopeful to develop into a kind of high-precision, generalization measuring technology and system.Since it the most directly and is truly described
Transport behavior of the signal light in optic fibre light path, so particularly suitable for high-precision to optical fibre device, component and optical fibre gyro etc.
Degree, superhigh precision interference-type optical fiber sensing light path are tested and are assessed.
In the early 1990s, France Herve Lefevre et al. [Method for the detection of
polarization couplings in a birefringent optical system and application of
this method to the assembling of the components of an optical system,US
Patent 4865531] the OCDP systems based on white light interference theory are made public for the first time, it uses super-radiance light emitting diode
(SLD) it is used as light source and space interference light path as light path measurement of correlation structure.French Photonetics companies are according to this patent
400 two kinds of model OCDP test systems of WIN-P 125 and WIN-P are had developed, are mainly used for shorter (500m) and longer
The polarization characteristic of (1600m) polarization maintaining optical fibre is analyzed.Its main performance be polarization interference sensitivity be -70dB, dynamic range is
70dB, after by improving, sensitivity and dynamic range promote respectively to -80dB and 80dB.
2011, University Of Tianjin Zhang Hongxia et al. disclose a kind of detection method of polarization extinction ratio of optical polarizer and
Detection device (Chinese Patent Application No.：201110052231.3), the core equally using space interference light path as OCDP fills
It sets, by detecting the stiffness of coupling of Coupling point, derives polarization extinction ratio.The device is suitable for polarization maintaining optical fibre, polarization maintaining optical fibre coupling
A variety of optical polarization devices such as clutch, polarizer.Compared with the scheme of Herve Lefevre et al., technical performance and index phase
Closely.
The same year, Yao Xiaotian of AM General photoelectricity company (General Photonics Corporation) et al. are open
A kind of all -fiber measuring system measured for distributed polarization interference in polarization maintaining optical fibre and optical birefringence material
(US20110277552, Measuring Distributed Polarization Crosstalk in Polarization
Maintaining Fiber and Optical Birefringent Material), using in light path demodulation and signal detection
Increase optical path delay device before device, the quantity and amplitude of spuious white light interference signal when polarization interference being inhibited to measure.This method can
The polarization interference sensitivity of all -fiber measuring system is increased to -95dB, but dynamic range is maintained at 75dB.
2012, present invention applicant proposed a kind of device and method improving optical device polarization interference measurement performance
(Chinese Patent Application No. CN201210376497.0) and a kind of optical device polarization interference measure all -fiber test device (in
State number of patent application CN201210376496.6), using the demodulation of all -fiber light path and signal sensor structure, increase polarization beam splitting
With online rotatable connection function, inhibits to clap noise, improve measurement sensitivity, increase Faraday polarization apparatus in the correlator, increase
The stability of light source.Compared with AM General photoelectricity company, the polarization interference sensitivity of measuring system can be increased to -95dB
While, so that dynamic range is maintained at better than 95dB.Sensitivity is not changing light channel structure, is changing already close to measuring limit
In the case of measuring thinking, measures noise when sensitivity and would become hard to be obviously improved.
2013, present invention applicant propose one kind expose thoroughly range optical coherence domain polarization measurement device (China specially
Sharp application number CN201310739313.4), it is cascaded using multiple continous way light path expanding elements, and make the scanning optics in unit
Device occurs in pairs, realizes light path scanning extension, inhibits influence of the scanner intensity floating to measurement.Mainly solve the problems, such as be
The accuracy and stability, measurement sensitivity performance for how improving polarization interference measurement do not improve.
2014, present invention applicant propose it is a kind of can inhibit interaction noise optical coherence polarimeter (in
State number of patent application CN201410120901.4), optical device remnants light reflections are eliminated using full fiber type polarization beat length device,
Overcome the polarization decay effect in interference using the light path demodulating equipment of Faraday polarization apparatus, effectively inhibits interaction noise；It proposes
Optical coherence domain polarization measurement device (Chinese Patent Application No. with light path scan position and velocity correction
CN201410120591.6), by the correction scanned to light path, improve the spatial accuracy of polarimeter and detect sensitive
Degree.But apparatus above is not obviously improved the signal-to-noise ratio for testing system, and it is mostly polarization maintaining optical fibre, meeting to use
Cause the increase of polarization interference noise.
To further increase test performance of polarization interference, including measurement signal-to-noise ratio, sensitivity and dynamic range etc., especially
It is to promote the signal-to-noise ratio of measuring system, Jin Erti while ensureing that device measures length and reduces test system building difficulty
High measurement sensitivity becomes the hot spot of research.The enhancing amplitude of measurement interference signal light is set to be higher than the enhancing of measurement system noise
Amplitude can thus make the signal-to-noise ratio of system obtain further promotion, improve measurement sensitivity.
The present invention provides a kind of apparatus and method of optical polarization device distribution crosstalk measurement sensitivity enhancing, pass through
Polarization beam splitting is carried out to signal light, extends the way of correlator, the method being overlapped using optics two-way correlator, enhancing letter
Number intensity, realizes the promotion of signal-to-noise ratio.It present invention can be widely used to high-acruracy survey and the analysis of optical device polarization property
In.
Invention content
The purpose of the present invention is to provide a kind of signal-to-noise ratio of enhancing measuring signal, improve the sensitivity that polarization interference measures
And dynamic range, it is measured for the high-acruracy survey of optical device polarization property and the optical polarization device distribution crosstalk of analysis
The device of sensitivity enhancing.
The object of the present invention is achieved like this：
A kind of device of optical polarization device distribution crosstalk measurement sensitivity enhancing, including wide spectrum light source 501, the polarizer
511, polarizer 522 to be measured, the first fiber rotation connector 521, the second fiber rotation connector 523, light path demodulation and letter
Number detector 530, signal detection and processing unit 560；
Wide spectrum light source 501 passes through polarization-maintaining light by the polarizer 511, the first rotary connector 521 with polarizer 522 to be measured
Fibre connection, the first rotary connector 521 make the output tail optical fiber of the polarizer 511 be polarized with the input tail optical fiber of polarizer 522 to be measured
Feature axis completes 0 °~45 ° alignments, and the line polarisation that the polarizer 511 exports is produced on the fast axle of polarizer 522 to be measured, slow axis
Raw identical transmission light component, after polarizer 522 to be measured, transmission light component part of the line polarisation in fast axle is to slow axis
Coupling, transmission light component part of the line polarisation on slow axis are coupled to fast axle, and polarizer 522 to be measured passes through the second rotatable connection
Device 523 and light path are demodulated to be connect with signal sensor 530, the second rotary connector 523 make metering device to be measured output tail optical fiber and
0 °~0 ° of the polarization sign axis realization that light path demodulates with the input tail optical fiber of signal sensor 530 is aligned, and makes light path demodulation and signal detection
Device 530 inputs the coupling light on transmission light component and slow axis in tail optical fiber fast axle in transmission fast axle into fast axle, is transmitted in slow axis
Coupling light on from transmission light component and fast axle in slow axis to slow axis；
Light path demodulates and signal sensor 530, is visited with signal by 1 × 2 polarization beam apparatus 531, the demodulation of first branch light path
Survey device 540, the demodulation of the second branch light path is formed with signal sensor 541 and detector, 1 × 2 polarization beam apparatus 531 is by light path solution
It adjusts and is detached with the light beam in slow axis with fast axle in the input tail optical fiber of signal sensor 530, export the transmission light component in fast axle all the way
With the coupling light in transmission light component and the fast axle coupled in light, all the way output slow axis on slow axis into fast axle into slow axis；
Via 1 × 2 polarization beam apparatus 531 output two-way beam splitting light respectively by single mode optical fiber be transmitted to light path demodulation with
The first branch light path demodulation of signal sensor and signal sensor 540, the demodulation of the second branch light path and signal sensor 541
In, the demodulation of two branch light paths in signal sensor respectively regular length light path reference arm and length variable light path scan arm
Interfered after transmission, the demodulation of two branch light paths and the detector and signal detection and processing unit 560 in signal sensor
Connection, and linear superposition processing and analysis are carried out with the signal that signal sensor generates to two branch light path demodulation, it obtains most
Whole interference signal, the numerical value of interference signal is directly proportional to the amplitude of polarization interference, the input product of light energy, and light path scans position
It sets corresponding with the position that polarization interference point occurs.
The light path demodulation and signal sensor 530, for the demodulation of first branch light path and signal sensor and second
Branch light path demodulate it is identical with parameter as the light path of signal sensor scanning arm configuration, two regular length light paths refer to arm configuration and
Parameter is identical；Two branch light path demodulation share the same light path delayed sweep line 549 with signal sensor；Light path delayed sweep
When line 549 is in movement start position, the absolute light path of the light path fixed reference arm per road is more than light path related scans arm；To two
A branch light path demodulation carries out linear superposition processing with signal sensor detectable signal.
The light path demodulation and signal sensor 530, is demodulated by Michelson formula light paths and is formed with detector 630, led to
The linearly polarized light signal for crossing device under test and rotary connector is injected into the polarization-maintaining input terminal ps1 of 1 × 2 polarization beam apparatus 631, and
All the way single mode optical fiber output end p s2, the second road single mode optical fiber output end p s3 be injected separately into Michelson formula light paths demodulation with
The first branch light path demodulation of signal sensor 530 and signal sensor 640 and the demodulation of the second branch light path and signal sensor
650, signal light is injected into the one 2 × 2nd fiber coupler 641, the 22 × 2nd fiber coupler 651, from first input end
Bs2, the second input terminal bs5 inputs, the first output port bs1, second output terminal mouth bs6 export the dry tributary signal of two-phase respectively
Light, the demodulation of first branch light path is with signal sensor 640 and the demodulation of the second branch light path with signal sensor 650 by the 1st
× 2 fiber couplers 641, the 22 × 2nd fiber coupler 651, general single mode fiber, the first faraday rotator mirror 644,
Second faraday rotator mirror 654, the first self-focusing collimation lens 643,653, first farads of the second self-focusing collimation lens
Circulator 642, the second Faraday rotator 652,649 and first detector 645, second detection of removable optical mirror
Device 655 forms；In the first branch of Michelson formula light paths demodulation and detector 630, the first output of the first coupler 641
Bs3 connections faraday rotator mirror 644 is held, regular length light path reference arm, the second output terminal of the first coupler 641 are formed
Bs4 connections Faraday rotator 642 simultaneously forms light path scanning with self-focusing collimation lens 643 and removable optical mirror 649
Arm is received by the two-way light of regular length light path reference arm and light path scan arm on the first detector 645；It is demodulated in light path
With the second branch of signal sensor 630, the first output end bs7 connections Faraday rotator 652 of the second coupler 651 and with
Self-focusing collimation lens 653 and removable optical mirror 649 form light path scan arm, the second output of the second coupler 651
Hold bs8 connections faraday rotator mirror 654, form regular length light path reference arm, by regular length light path reference arm with
The two-way light of light path scan arm receives on the second detector 654.
The light path demodulation is demodulated with signal sensor 530 by Mach-Zehnder formula light paths to be formed with detector 730, is led to
The linearly polarized light signal for crossing device under test and rotary connector is injected into the polarization-maintaining input terminal ps4 of 1 × 2 polarization beam apparatus 731, and
Single mode optical fiber output end p s5 and the second road single mode optical fiber output end p s6 are injected separately into Mach-Zehnder formula light path solutions all the way
It adjusts and the demodulation of the first branch light path of detector 730 and signal sensor 740, the demodulation of the second branch light path and signal sensor
750, signal light is injected into the one 1 × 2nd beam splitter 732, the 21 × 2nd beam splitter 738, from first input end bs9, second
Input terminal bs16 inputs, first branch correlator 740,750 respective two output port of the second branch correlator are made at difference respectively
With two-phase Heavenly Stems and Earthly Branches road signal light output after reason, the demodulation of first branch light path and signal sensor 740, the demodulation of the second branch light path with
Signal sensor 750 is by 1 × 2 beam splitter, general single mode fiber, polarization beat length device, 2 × 2 couplers, circulator, collimation
Mirror, removable optical mirror 744 and detector composition, the of the demodulation of Mach-Zehnder formula light paths and detector 730
One branch, 1 × 2 beam splitter 732 will be divided into two bundles by the signal light of polarization beam apparatus 731, a branch of to pass through general single mode fiber
It connects polarization beat length device and constitutes regular length light path reference arm, it is a branch of to pass through collimating mirror 734 and removable optical mirror 744
Light path scan arm is formed, by the two-way light of regular length light path reference arm and light path scan arm in the first detector 736 and the
Differential received on two detectors 737；In the second branch of Mach-Zehnder formula light paths demodulation and detector 730,1 × 2 beam splitting
Device 738 will be divided into two bundles by the signal light of polarization beam apparatus 731, a branch of to connect polarization beat length device by general single mode fiber
Regular length light path reference arm is constituted, it is a branch of that light path scan arm is formed by collimating mirror 741 and removable optical mirror 744,
It is poor on third detector 742 and the 4th detector 743 by the two-way light of regular length light path reference arm and light path scan arm
Tap is received.
The polarizer 511, the first rotary connector 521, the second rotary connector 523, polarizer 522 to be measured, light path solution
It adjusts and signal sensor 530, detector, wavelength wavelength operating range can cover the emission spectrum of wide spectrum light source 501；The polarizer 511
Output tail optical fiber, polarization beam apparatus 531 input tail optical fiber be operated in single mode, polarization hold mode；Polarization beam apparatus 531 exports tail
Fine, light path demodulation and signal sensor 530, detector is operated in single mode.
The beneficial effects of the present invention are：
(1) on the basis of single correlator measuring limit, using light path demodulation and the same pacing of two branch of signal sensor
The structure of amount is detached using polarization beam apparatus by the signal light on two polarization principal axis is transmitted, two-way interference signal synchronous scanning
Linear superposition afterwards is promoted that will measure signal-to-noise ratioAgain while (3dB), and the absolute intensity of distributed crosstalk can be measured, greatly
Width improves measuring system sensitivity and accuracy.
(2) it removes to connect between the input tail optical fiber of polarization beam apparatus in wide spectrum light source and light path demodulation and signal sensor and need
Outside using polarization maintaining optical fibre, it is operated in general single mode state with device with optical fiber all in signal sensor in light path demodulation,
The requirement to optical device and connection optical fiber is reduced, conducive to efficiently building for measuring system.
(3) scanning is synchronized to two-phase Heavenly Stems and Earthly Branches road correlator using same scan table, avoids increasing because increasing scan table
Unstability, volume and the cost of adding system, you can expanded on the basis of in addition not increasing optical delay line and measure branch, increase
Strong system signal-to-noise ratio.
Description of the drawings
Fig. 1 is the optical principle schematic diagram that the distributed polarization interference of optical device measures；
Fig. 2 is the interference signal amplitude and light path correspondence schematic diagram that polarization interference is formed；
Fig. 3 is the technical solution schematic diagram of optical polarization device distribution crosstalk measurement sensitivity intensifier；
Fig. 4 is the light path schematic diagram measured using the optical device polarization interference of single correlator；
Fig. 5 is the enhancing optical device polarization interference measurement scheme based on Michelson formula light paths demodulation and detector
Light path schematic diagram；
Fig. 6 is the technical solution schematic diagram of Michelson formula light paths demodulation and detector；
Fig. 7 is the technical solution schematic diagram of Mach-Zehnder formula light paths demodulation and detector；
Fig. 8 measures signal-to-noise ratio using the demodulation of Michelson formula light paths and detector enhancing optical device polarization interference
Technical solution schematic diagram；
Fig. 9 is to measure signal-to-noise ratio using the demodulation of Mach-Zehnder formula light paths and detector enhancing optical device polarization interference
Technical solution schematic diagram.
Specific implementation mode
To clearly demonstrate the method and apparatus that the present invention improves optical device distributed polarization interference measurement performance, in conjunction with
The invention will be further described for embodiment and attached drawing, but should not be limited the scope of the invention with this.
The present invention provides a kind of devices of optical polarization device distribution crosstalk measurement sensitivity enhancing, it is characterized in that
Fast, slow two polarization principal axis of device under test inject line polarisation simultaneously, and keep fast, transmission signal light on slow axis energy equal,
The latter linked polarization beam apparatus of device under test makes optical signal separation (including transmission light and coupling of the transmission in two polarization principal axis
Optical signal), it shares two light paths demodulation of same optical delay line and signal sensor realizes that fast, two polarizations of slow axis are led simultaneously
The measurement of distributed polarization interference in axis makes measurement sensitivity and dynamic model by the linear superposition processing to the measuring signal
Enclose promotionTimes.The device on the basis of complete optical fiber polarization crosstalk measuring system, by optimize measuring device light channel structure and
Parameter may be implemented the enhancing of measurement sensitivity enhancing and dynamic range, be widely used in polarization maintaining optical fibre, integrated waveguide modulator (Y
Waveguide) etc. optical devices polarization property high-acruracy survey and analysis.
A kind of device of optical polarization device distribution crosstalk measurement sensitivity enhancing, including wide spectrum light source, the polarizer, wait for
Polarizer, fiber rotation connector, light path demodulation and signal sensor, signal detection and processing unit are surveyed, it is characterized in that：
(1) wide spectrum light source is connect with polarizer to be measured by polarization maintaining optical fibre by the polarizer, the 1st rotary connector, and the 1st
Rotary connector keeps the output tail optical fiber of the polarizer and 0 °~45 ° of the input tail optical fiber polarization characteristic axis completion of polarizer to be measured right
The line polarisation that the polarizer exports is generated identical transmission light component, by waiting for by standard on the fast axle of polarizer to be measured, slow axis
After surveying polarizer, transmission light component of the line polarisation in fast axle can be coupled partly to slow axis, transmission of the line polarisation on slow axis
Light component part is coupled to fast axle, and polarizer to be measured is demodulated with light path by the 2nd rotary connector and connect with signal sensor,
2nd rotary connector keeps the output tail optical fiber of metering device to be measured and light path demodulation and the polarization sign axis of signal sensor input tail optical fiber real
Existing 0 °~0 ° alignment makes light path demodulation and the transmission light component and slow axis in transmission fast axle in signal sensor input tail optical fiber fast axle
On coupling light in the coupling light into fast axle, the transmission light component in slow axis in transmission slow axis and from fast axle to slow axis.
(2) light path demodulation and signal sensor are visited by 1 × 2 polarization beam apparatus, the 1st, the demodulation of the 2nd branch light path with signal
Survey device and detector composition.1 × 2 polarization beam apparatus inputs light path demodulation and signal sensor in tail optical fiber in fast axle and slow axis
Light beam detaches, and exports the coupling light on transmission light component and slow axis in fast axle into fast axle all the way, exports in slow axis all the way
Transmit the coupling light into slow axis in light component and fast axle.
Light path demodulation and letter are transmitted to by single mode optical fiber respectively via the two-way beam splitting light of 1 × 2 polarization beam apparatus output
Number detector the 1st, the demodulation of the 2nd branch light path in signal sensor, in the demodulation of the 1st, the 2nd branch light path and signal sensor
Interfered after being transmitted in respective regular length light path reference arm and length variable light path scan arm, the 1st, the 2nd branch light path solution
Adjust in signal sensor detector and signal detection connect with processing unit, and to the 1st, the 2nd branch light path demodulation and letter
The signal that number detector generates carries out linear superposition processing and analysis, obtains final interference signal.The numerical value of interference signal with partially
Shake crosstalk amplitude, input light energy product it is directly proportional, light path scan position is opposite with the position that polarization interference point occurs
It answers.
Light path demodulates and signal sensor, it is characterized in that：For the 1st, the 2nd branch light path demodulation and signal sensor,
Light path scanning arm configuration is identical as parameter, and two regular length light paths are identical as parameter with reference to arm configuration；1st, the 2nd branch light path solution
It adjusts and shares the same light path delayed sweep line with signal sensor；When light path delayed sweep line is in movement start position, per road
Light path fixed reference arm absolute light path be slightly larger than light path related scans arm；The demodulation of 1st, the 2nd branch light path is visited with signal
It surveys device detectable signal and carries out linear superposition processing.More typical structure include Michelson formula light paths demodulation with detector and
The demodulation of Mach-Zehnder formula light paths and detector etc..
Light path demodulates and signal sensor, it is characterized in that：It can be demodulated by Michelson formula light paths and be formed with detector, led to
The linearly polarized light signal for crossing device under test and rotary connector is injected into the polarization-maintaining input terminal of 1 × 2 polarization beam apparatus, two-way single mode
Fiber-optic output is injected separately into two branch light paths demodulation and signal detection of the Michelson formula light paths demodulation with signal sensor
Device.Signal light is injected into 2 × 2 fiber couplers, is inputted from two input terminals, and two output ports export two-phase Heavenly Stems and Earthly Branches road respectively
Signal light.Two branch light paths, which are demodulated, to be reflected with signal sensor by 2 × 2 couplers, general single mode fiber, Faraday rotation
Mirror, self-focusing collimation lens, Faraday rotator, removable optical mirror and detector composition.In Michelson formula light
Journey demodulates the 1st branch with detector, and the 1st output end of the 1st coupler connects faraday rotator mirror, forms regular length
Light path reference arm, the 1st coupler the 2nd output end connection Faraday rotator and with self-focusing collimation lens and removable optics
Speculum group is at light path scan arm, by the two-way light of regular length light path reference arm and light path scan arm on the 1st detector
It receives；Light path demodulation and the 2nd branch of signal sensor, the 1st output end connection Faraday rotator of the 2nd coupler and with
Self-focusing collimation lens and removable optical mirror form light path scan arm, and the 2nd output end of the 2nd coupler connects faraday
Rotating mirror forms regular length light path reference arm, passes through the two-way light of regular length light path reference arm and light path scan arm
It is received on the 2nd detector.
Light path demodulates and signal sensor, it is characterized in that：It can be demodulated by Mach-Zehnder formula light paths and be formed with detector,
The polarization-maintaining input terminal of 1 × 2 polarization beam apparatus, two-way list are injected by the linearly polarized light signal of device under test and rotary connector
Mode fiber output end is injected separately into the demodulation of Mach-Zehnder formula light paths and the two branch light paths demodulation of detector is visited with signal
Survey device.Signal light is injected into 1 × 2 beam splitter, is inputted from two input terminals, and two branch correlators respectively distinguish by two output ports
Make after difference processing with two-phase Heavenly Stems and Earthly Branches road signal light output.Two branch light paths demodulate with signal sensor by 1 × 2 beam splitter,
General single mode fiber, polarization beat length device, 2 × 2 couplers, circulator, collimating mirror, removable optical mirror and detector
Composition.In the 1st branch of Mach-Zehnder formula light paths demodulation and detector, 1 × 2 beam splitter will pass through the letter of polarization beam apparatus
Number light is divided into two bundles, a branch of to connect polarization beat length device by general single mode fiber and constitute regular length light path reference arm, a branch of
Light path scan arm is formed by collimating mirror and removable optical mirror, passes through regular length light path reference arm and light path scan arm
Two-way light on the 1st detector and the 2nd detector differential received；In Mach-Zehnder formula light paths demodulation and the of detector
2 branches, 1 × 2 beam splitter will be divided into two bundles by the signal light of polarization beam apparatus, and a branch of connected by general single mode fiber polarizes
State controller constitutes regular length light path reference arm, a branch of to form light path scanning by collimating mirror and removable optical mirror
Arm, by the two-way light of regular length light path reference arm and light path scan arm, difference connects on the 3rd detector and the 4th detector
It receives.
The polarizer, the 1st, the 2nd rotary connector, polarizer to be measured, light path demodulation and signal sensor, detector,
It is characterized in：Wavelength wavelength operating range can cover the emission spectrum of wide spectrum light source；The output tail optical fiber of the polarizer, polarization beam apparatus input
Tail optical fiber is operated in single mode, polarization hold mode；Polarization beam apparatus exports tail optical fiber, light path demodulation and signal sensor, detector
It is operated in single mode.
The present invention is changed to a kind of technology of the optical coherence domain polarization test system (OCDP) based on white light interference theory
Into.For the operation principle of OCDP as shown in Figure 1, by taking the performance test of polarization maintaining optical fibre as an example, the high stable sent out by wide spectrum light source is wide
Spectrum polarised light 101 is injected into the slow axis of the polarization maintaining optical fibre 121 of certain length (when fast axle, principle is identical).Geometry when due to making
Structure existing defects, the non-ideal effect that stress is previously applied, or under the action of ambient temperature and load, make to deposit in optical fiber
In certain defect point 111.When signal light is transmitted along slow axis, when signal light is transferred to defect point 111, a part of luminous energy in slow axis
Amount will be coupled in orthogonal fast axle, form coupling light beam 103, and remaining transmitting beam 102 is still transmitted along slow axis.Light
Fibre 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, when other the one of optical fiber
(transmission range l), then transmission will be deposited in the transmission light 102 of slow axis and transmission between the coupling light 103 of fast axle when the output of end
In an optical path difference Δ nl.Above-mentioned light beam is by pad or rotary connecting joint 112, by transmission light and coupling polarization state rotation
After turning 45 °, into light path demodulation and signal sensor 130.In light path demodulation and signal sensor 130, optical beam splitting mirror
132, stationary mirror 133, mobile mirror 134 form a Michelson optical interdferometer.Light beam 102 and 103 is by inspection
After the inclined polarization of device 131 polarization, two parts are divided evenly by optical splitter 132 respectively.As shown in Fig. 2, by transmission light 201 and coupling
Light 202 forms reference beam, transmits in the fixed arm of interferometer, optical splitter is returned to after the reflection of stationary mirror 133
132；Scanning light beam is formed by transmission light 203 and coupling light 204, also passes through and also returns to after the reflection of mobile mirror 134 point
Light device 132, two parts light converge in formation white light interference signal on detector 137, are received and convert optical signals to electricity
Signal.This signal is sent into after the processing of signal demodulating circuit 151 in metering computer 152；In addition metering computer 152 is gone back
It is responsible for controlling the realization light path scanning of mobile mirror 134.
As shown in Fig. 2, under the control of metering computer 152, the mobile mirror 134 of Michelson interferometers makes to do
The optical path difference of interferometer two-arm is from Δ nl through zero passage, scanning to-Δ nl：
(1) when optical path difference is equal to Δ nl, coupling light 204 and 201 light path of transmission light in reference beam in scanning light beam
It matches, then generates white light interference signal, peak amplitude isThe coupling width of it and defect point
It spends the factor and the intensity of light source is directly proportional；
(2) when optical path difference is zero, reference beam 201,202 respectively in scanning light beam transmission light 205, couple light
206 light paths match, and generate white light interference signal respectively, and peak amplitude is the intensity superposition of the two, amplitude Imain
∝I0, it is directly proportional to light source input power.As figure shows, compared with previous white light interference signal, two white light interference letters
Optical path difference between number peak value is just Δ nl.If it is known that the linear birefrigence Δ n of optical device, then can be calculated scarce
The position l that trapping spot occurs, and the power that defect point can be calculated by the ratio of interference signal peak strength couples size
ρ；
(3) when optical path difference is equal to-Δ nl when, transmission light 207 and 202 light path of coupling light in reference beam in scanning light beam
It matches, then generates white light interference signal, peak amplitude isWhen it with optical path difference is Δ nl
It is identical.As figure shows, compared with when optical path difference is Δ nl, this white light interference signal is symmetrical on light path therewith, identical in amplitude.
Polarization interference ρ can be the polarization interference signal amplitude I that Δ nl or-Δ nl are obtained according to optical path differencecoupling, with
And optical path difference obtains transmission optical signal magnitude I when being zeromainIt is calculated：
Since general polarization interference is much smaller than 1, the variation of (1) formula is：
In optical coherence polarization measurement as shown in Figure 1, light path uses the side to transmission light and the equipartition of energy for coupling light
Formula has Px=Pr=Ps+Pc=Ps+ρPs=Ps(1+ ρ), wherein PsTo transmit luminous intensity, PcFor coupled light intensity, ρ is coupled systemes
Number, under normal circumstances, ρ ＜ ＜ 1.
The signal amplitude of polarization coupled can indicate to become：
As it can be seen that the optical coherence domain polarization test system (OCDP) in white light interference theory uses a light path demodulation and letter
When number detector, in the case of not considering circuit thermal noise, the signal-to-noise ratio of detection is expressed as：
For the polarization interference testing scheme using light path demodulation and signal sensor, in the 1st rotary connector 521 with 0 °
In the case of~45 ° of alignments, polarised light that wide spectrum light source 501 is sent out, which is injected into the testing fiber 522 of certain length, to be gone (as schemed
5A in 5), all there is the identical transmission light component of amplitude in polarised light, in fast axle and slow-axis direction with the transmission light of fast axis direction
Component is Is1, it is I with the transmission light component of slow-axis directions2, due to make when geometry defect, stress is previously applied
It is non-ideal effect and ambient temperature and load effect, when two transmission light components be transferred to defect point when, respectively to it is respective just
Quadrature axis couples part energy (5B in such as Fig. 5), forms coupling light beam Ic1And Ic2, wherein Ic2It is transmitted in fast axis direction, wherein Ic1
It is transmitted in slow-axis direction.
Due to being 0 °~45 ° alignments, two branches transmission luminous intensity component：
Ps1=Ps2 (6)
Two branches couple light component：
The signal amplitude measured on two branch locators is represented by：
For two detection branch noises：
Light path demodulates each branch with signal sensor：
When two tributary signals being made to be superimposed, since two branch amplitudes are identical, and meet the spy that interference signal meets amplitude superposition
Sign, so the signal amplitude after detection superposition：
Light path demodulation meets power with two branch noises of signal sensor and is superimposed, so, the final output of correlator：
Contrast (5) and formula (12), when superimposed with signal sensor using light path demodulation, since interference signal amplitude is folded
Add, noise power superposition, the increasing degree of noise intensity is better than to the promotion amplitude of signal strength, compared to single correlation
Device structure can be such that system signal noise ratio is promotedTimes, promote sensitivity and the dynamic range of measuring system.
Based on the distributed polarization interference measurement scheme of light path demodulation and signal sensor, as shown in Figure 4.Main phototube
The selection of part and its parameter are as follows：
(1) the centre wavelength 1550nm of wide spectrum light source 501, half spectral width are more than 45nm, and fiber power is more than 2mW, delustring
Than being more than 6dB；
(2) operation wavelength of optical fiber polarizer 511 is 1550nm, and extinction ratio 30dB, insertion loss is less than 1dB, input
End is single mode optical fiber, is exported as panda type polarization-preserving fiber；
(3) the 1st, the insertion loss of the 2nd fiber rotation connector 521,523 is 1dB；Polarizer 622 to be measured is 200m
Panda type polarization-preserving fiber；
The operation wavelength of (4) 1 × 2 polarization beam apparatus 631,731 is 1550nm, and extinction ratio is more than 20dB, and insertion loss is small
In 0.5dB；
(5) operation wavelength of faraday rotator mirror 644,654 is 1550nm, 90 ± 1 ° of optically-active angle, insertion loss
Less than 0.6dB；
(6) operation wavelength of Faraday rotator 642,652 is 1550nm, and 45 ± 1 ° of optically-active angle, insertion loss is less than
0.3dB；
The operation wavelength of (7) 1 × 2 beam splitters 732,738 is that 1550nm insertion loss is less than 0.5dB；
The operation wavelength of (8) 2 × 2 fiber couplers 641,651,735,741 is 1550nm, input and output tail optical fiber bs1~
Bs22 is ordinary optic fibre, splitting ratio 1:1, insertion loss is less than 0.1dB.
The operation wavelength of (9) three port circulators 733,739 is 1550nm, insertion loss 0.8dB, and isolation is more than
50dB；
(10) operation wavelength of polarization beat length device 745,746 is 1550nm, insertion loss 0.5dB；
(11) operation wavelength of self-focusing collimation lens 644,654,734,741 is 1550nm, they are with removable optics
Light path scanning distance between speculum 649,744 (reflectivity is 92% or more) about changes between 0~400mm, average
Insertion loss is 3.0dB；
(12) operation wavelength of speculum 644,654 is 1550nm, and insertion loss is less than 0.6dB；
(13) light-sensitive material of photodetector 651,654,736,737,742,743 is InGaAs, optical detection range
For 1100~1700nm, the Nirvana of New Focus companies is such as usedTMSerial 2017 type balanced detectors.
The course of work of measuring device is as follows：
Device 1：Enhancing optical device polarization interference measuring device based on Michelson formula light paths demodulation and detector
The output light of wide spectrum light source 501 by the polarizer 511 become line polarisation, by the 1st rotary connector 521 with it is to be measured
Polarizer 522 connects, and the alignment angle for adjusting the 1st rotary connector 521 is 0 °~45 °, so that line polarisation is coupled to be measured inclined
It shakes in two polarization characteristic axis of device 522, becomes the identical two transmission light component of amplitude, as shown in 5A in Fig. 5.Two transmission light
In 522 transmission process of polarizer to be measured, the coupling light component on respective quadrature axis is will produce at defect point.Adjust the
The alignment angle of 2 rotary connectors 523 is 0 °~0 °, keeps two orthogonal signalling optical registration polarization beam apparatus 631 of polarized orthogonal defeated
Two orthogonal directions for entering tail optical fiber, the two paths of signals light I after beam splittings1、Ic2With coupling light Is2、Ic1, respectively in polarization beam apparatus 631
Two single-mode output tail optical fibers in be transmitted to Michelson formula light paths demodulation with 630 structure of signal sensor in.
For the demodulation of the 1st branch light path and signal sensor 640, pass through in the signal light component of general single mode fiber transmission
2 × 2 fiber couplers 641 are divided into two bundles signal light and arrive separately at light path scan arm and fixed reference arm, fixed light path reference arm
In signal light return to 2 × 2 fiber couplers 641 by faraday rotator mirror 644, the signal light warp in light path scan arm
It is radiated on removable optical mirror 649 after crossing Faraday rotator 642 and collimating mirror 643, the signal light after reflection is again
It is generated and is done on the 1st detector 645 by the signal light in 2 × 2 fiber couplers and light path scan arm by collimating mirror 643
It relates to；
For the demodulation of the 2nd branch light path and signal sensor 650, in the transmission light and coupling light of general single mode fiber transmission
Component is divided into two bundles signal light by 2 × 2 fiber couplers 651 and arrives separately at light path scan arm and fixed reference arm, fixed light
Signal light in journey reference arm returns to 2 × 2 fiber couplers 651 by faraday rotator mirror 654, in light path scan arm
Signal light is radiated at after Faraday rotator 652 and collimating mirror 653 on removable optical mirror 649, the letter after anti-mirror
Number light again passes by collimating mirror 653 by the signal light in 2 × 2 fiber couplers and light path scan arm 655 on the 2nd detector
Generate interference.
During two branch light path scan arms and fixed light path reference arm scan matching, receive on the 1st, 2 detectors
The interference signal arrived obtains final measuring signal by linearly overlap-add procedure, keeps the signal-to-noise ratio of interference signal further
It is promoted.
Device 2:Enhancing optical device polarization interference based on the demodulation of Mach-Zehnder formula light paths and detector, which measures, to be filled
It sets
The output light of wide spectrum light source 501 by the polarizer 511 become line polarisation, by the 1st rotary connector 521 with it is to be measured
Polarizer 522 connects, and the alignment angle for adjusting the 1st rotary connector 521 is 0 °~45 °, adjusts the 2nd rotary connector 523
Alignment angle be 0 °~0 °, so that two orthogonal signalling optical registration polarization beam apparatus 731 of polarized orthogonal is inputted the two orthogonal of tail optical fiber
Direction, the two paths of signals light I after beam splittings1、Ic2With coupling light Is2、Ic1, respectively in two single-mode output tails of polarization beam apparatus 731
It is transmitted in fibre in the demodulation of Mach-Zehnder formula light paths and 730 structure of signal sensor.
For the demodulation of the 1st branch light path and signal sensor 740, pass through in the signal light component of general single mode fiber transmission
1 × 2 beam splitter 732 is divided into two bundles signal light and arrives separately at light path scan arm and fixed reference arm, fixes in light path reference arm
Signal light is transmitted to 2 × 2 fiber couplers 735 by polarization beat length device 745, and the signal light in light path scan arm is by annular
Signal light is reflexed to 2 × 2 fiber couplers 735, two-arm by device 733 by collimating mirror 734 and removable optical mirror 744
Signal light receives on detector 736,737 and forms differential interferometry signal；
For the demodulation of the 2nd branch light path and signal sensor, general single mode fiber transmission signal light component by 1 ×
2 beam splitters 738 are divided into two bundles signal light and arrive separately at light path scan arm and fixed reference arm, the signal in fixed light path reference arm
Light is transmitted to 2 × 2 fiber couplers 735 by polarization beat length device 746, and the signal light in light path scan arm passes through circulator
739, signal light is reflexed to by 2 × 2 fiber couplers 735, two-arm letter by collimating mirror 741 and removable optical mirror 744
Number light receives on detector 742,743 forms differential interferometry signal.
The differential interferometry signal of two branches can obtain the exchange interference term of multiplication, then in the influence for eliminating direct current light intensity
Processing is overlapped to differential interferometry signal, polarization interference is further promoted and measures signal-to-noise ratio.
By the different light path demodulation of both the above with signal sensor as it can be seen that being surveyed for enhancing optical device polarization interference
Distribution can be obtained by above-mentioned measurement process for the demodulation of different light paths and signal sensor in the device for measuring signal-to-noise ratio
Polarization interference amplitude.Due to making two-way synchro measure, the amplitude of interference signal be superimposed using light path demodulation and signal sensor, it is
The energy supposition of system noise can be such that the signal-to-noise ratio of system is measured than single channel under identical structure and be promotedTimes, about 3dB.
Claims (1)
1. a kind of device of optical polarization device distribution crosstalk measurement sensitivity enhancing, including wide spectrum light source (501), the polarizer
(511), polarizer (522) to be measured, the first fiber rotation connector (521), the second fiber rotation connector (523), light path
Demodulation and signal sensor (530), signal detection and processing unit (560), it is characterised in that：
Wide spectrum light source (501) is logical by the polarizer (511), the first fiber rotation connector (521) and polarizer to be measured (522)
Polarization maintaining optical fibre connection is crossed, the first fiber rotation connector (521) makes the output tail optical fiber of the polarizer (511) and polarizer to be measured
(522) input tail optical fiber polarization characteristic axis completes 0 °~45 ° alignments, by the line polarisation of the polarizer (511) output in polarization to be measured
Identical transmission light component is generated in the fast axle of device (522), slow axis, after polarizer to be measured (522), line polarisation is fast
Transmission light component part on axis is coupled to slow axis, and transmission light component part of the line polarisation on slow axis is coupled to fast axle, to be measured
Polarizer (522) is demodulated with light path by the second fiber rotation connector (523) and is connect with signal sensor (530), and second
Fiber rotation connector (523) makes the output tail optical fiber of metering device to be measured input tail optical fiber with signal sensor (530) with light path demodulation
Polarization sign axis realize 0 °~0 ° alignment, make light path demodulation with signal sensor (530) input tail optical fiber fast axle in transmission fast axle in
Transmission light component and slow axis in the coupling light into fast axle, the transmission light component in slow axis in transmission slow axis and fast axle to slow
Coupling light in axis；
Light path is demodulated with signal sensor (530) by the one 1 × 2nd polarization beam apparatus (531), the demodulation of first branch light path and signal
Detector (540), the demodulation of the second branch light path are formed with signal sensor (541), and the one 1 × 2nd polarization beam apparatus (531) is by light
Journey, which is demodulated, to be detached with fast axle in signal sensor (530) input tail optical fiber with the light beam in slow axis, exports the transmission in fast axle all the way
Coupling light, exporting the coupling transmitted in light component and fast axle into slow axis in slow axis all the way into fast axle on light component and slow axis
Closing light；
Light path demodulation is transmitted to by single mode optical fiber respectively via the two-way beam splitting light of the one 1 × 2nd polarization beam apparatus (531) output
First branch light path demodulation with signal sensor (530) is visited with signal sensor (540), the demodulation of the second branch light path with signal
It surveys in device (541), in two branch light path demodulation and the respective regular length light path reference arm of signal sensor (540,541) and length
Interfered after being transmitted in degree variable light path scan arm, two branch light path demodulation and the spy in signal sensor (540,541)
It surveys device and signal detection is connect with processing unit (560), and two branch light path demodulation are produced with signal sensor (540,541)
Raw signal carries out linear superposition processing and analysis, obtains final interference signal, the numerical value of interference signal and the width of polarization interference
Value, the product of input light energy are directly proportional, and light path scan position is corresponding with the position that polarization interference point occurs；
First branch light path demodulation and signal sensor (540) and second of the light path demodulation with signal sensor (530)
Branch light path demodulates, two regular length light path reference arms identical as parameter as the light path of signal sensor (541) scanning arm configuration
Structure is identical as parameter；Two branch light path demodulation share the same light path delayed sweep line with signal sensor (540,541)
(549)；When light path delayed sweep line (549) is in movement start position, the absolute light path of the light path fixed reference arm per road is big
In light path related scans arm；
The light path demodulation is demodulated with signal sensor (530) by Michelson formula light paths to be formed with detector (630), is led to
The signal light for crossing polarizer to be measured (522) and the second fiber rotation connector (523) is injected into the 21 × 2nd polarization beam apparatus
(631) polarization-maintaining input terminal (ps1), first branch single mode optical fiber output end (ps2), the second branch single mode optical fiber output end
(ps3) first branch light path demodulation and signal sensor of the Michelson formula light paths demodulation with detector (630) are injected separately into
(640) and the second branch light path demodulation with signal sensor (650), signal light be injected into the one 2 × 2nd fiber coupler (641),
In 22 × 2nd fiber coupler (651), inputted from first input end (bs2), the second input terminal (bs5), the first output end
Mouth (bs1), second output terminal mouth (bs6) export two-phase Heavenly Stems and Earthly Branches road signal light, the demodulation of first branch light path and signal detection respectively
Device (640) is by the one 2 × 2nd fiber coupler (641), general single mode fiber, the first Faraday rotator (642), the first autohemagglutination
Focus collimation lens (643), the first faraday rotator mirror (644), removable optical mirror (649) and the first detector
(645) it forms；The second branch light path is demodulated with signal sensor (650) by the 22 × 2nd fiber coupler (651), general single mode
Optical fiber, the second Faraday rotator (652), the second self-focusing collimation lens (653), the second faraday rotator mirror (654),
Removable optical mirror (649) and the second detector (655) composition；In the demodulation of Michelson formula light paths and detector
(630) the first output end (bs3) the first Faraday rotation of connection of the first branch, the one 2 × 2nd fiber coupler (641) is anti-
Mirror (644) is penetrated, regular length light path reference arm, second output terminal (bs4) connection of the one 2 × 2nd fiber coupler (641) are formed
First Faraday rotator (642) simultaneously forms light with the first self-focusing collimation lens (643) and removable optical mirror (649)
Journey scan arm is received by the two-way light of regular length light path reference arm and light path scan arm on the first detector (645)；
Michelson formula light paths demodulate and the second branch of signal sensor (630), and the first of the 22 × 2nd fiber coupler (651)
Output end (bs7) the second Faraday rotator of connection (652) is simultaneously anti-with the second self-focusing collimation lens (653) and removable optics
Mirror (649) composition light path scan arm is penetrated, the second output terminal (bs8) of the 22 × 2nd fiber coupler (651) connects second farad
Rotating mirror (654) forms regular length light path reference arm, passes through regular length light path reference arm and light path scan arm
Two-way light receives on the second detector (655)；
Or the light path demodulation is demodulated and detector (730) group with signal sensor (530) by Mach-Zehnder formula light paths
At, by the signal light of polarizer to be measured (522) and the second fiber rotation connector (523) be injected into the 31 × 2nd polarization point
The polarization-maintaining input terminal (ps4) of beam device (731), first branch single mode optical fiber output end (ps5) are exported with the second branch single mode optical fiber
End (ps6) is injected separately into third branch light path demodulation and signal of the Mach-Zehnder formula light paths demodulation with detector (730)
Detector (740), the demodulation of the 4th branch light path and signal sensor (750), signal light are injected into the one 1 × 2nd beam splitter
(732), it in the 21 × 2nd beam splitter (738), is inputted from first input end (bs9), the second input terminal (bs16), third branch
Light path is demodulated with signal sensor (740) by the one 1 × 2nd beam splitter (732), general single mode fiber, the first Polarization Controller
(745), first annular device (733), third self-focusing collimation lens (734), removable optical mirror (649), the one 2 × 2nd
Beam splitter (735) and third detector (736), the 4th detector (737) composition；4th branch light path demodulates and signal detection
Device (750) is by the 21 × 2nd beam splitter (738), general single mode fiber, the second Polarization Controller (746), the second circulator
(739), four selfs focussed collimated lens (740), removable optical mirror (649), the 22 × 2nd beam splitter (741) and the
Five detectors (742), the 6th detector (743) composition；In the third of Mach-Zehnder formula light paths demodulation and detector (730)
Branch, the one 1 × 2nd beam splitter (732) will be divided into two bundles by the signal light of the 31 × 2nd polarization beam apparatus (731), Yi Shutong
Cross general single mode fiber connect the first polarization beat length device (745) constitute regular length light path reference arm, it is a branch of by third from
Focussed collimated lens (734) and removable optical mirror (649) form light path scan arm, pass through regular length light path reference arm
With the two-way light of light path scan arm on third detector (736) and the 4th detector (737) differential received；In Mach-
Zehnder formula light paths demodulate the 4th branch with detector (730), and the 21 × 2nd beam splitter (738) will be by the 31 × 2nd partially
The signal light of beam splitter (731) of shaking is divided into two bundles, and a branch of general single mode fiber that passes through connects second polarization beat length device (746) structure
It is a branch of to pass through four selfs focussed collimated lens (740) and removable optical mirror (649) group at regular length light path reference arm
At light path scan arm, by the two-way light of regular length light path reference arm and light path scan arm in the 5th detector (742) and
Differential received on six detectors (743)；
The polarizer (511), the first fiber rotation connector (521), the second fiber rotation connector (523), polarizer to be measured
(522) and light path demodulates the transmitting light that wide spectrum light source (501) can be covered with the wavelength wavelength operating range of signal sensor (530)
Spectrum；The output tail optical fiber of the polarizer (511), the one 1 × 2nd polarization beam apparatus (531), the 21 × 2nd polarization beam apparatus (631),
The input tail optical fiber of 31 × 2nd polarization beam apparatus (731) is operated in single mode, polarization hold mode；One 1 × 2nd polarization beam apparatus
(531), the 21 × 2nd polarization beam apparatus (631), the output tail optical fiber of the 31 × 2nd polarization beam apparatus (731), light path demodulation with
Signal sensor (530) is operated in single mode；
Demodulated using light path makes system signal noise ratio be promoted with signal sensor (530)Times.
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| CN109274434B (en) * | 2018-11-07 | 2022-04-15 | 桂林电子科技大学 | Light energy and light signal receiving and transmitting processing system based on single optical fiber integrated optical cable |
| CN112305550A (en) * | 2019-08-01 | 2021-02-02 | 宁波飞芯电子科技有限公司 | Coherent detection device and method |
| CN111555803B (en) * | 2020-05-22 | 2021-07-27 | 中天宽带技术有限公司 | Bidirectional multi-core optical fiber crosstalk calculation method and device and computer readable storage medium |
| 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 |
| CN112147623B (en) * | 2020-09-03 | 2024-03-12 | 五邑大学 | Multi-zone ranging method and system based on chaotic polarized radar |
| CN113804301A (en) * | 2021-07-20 | 2021-12-17 | 广东工业大学 | Distributed polarization crosstalk rapid measuring device based on optical frequency domain frequency shift interference |
| CN113804302A (en) * | 2021-07-20 | 2021-12-17 | 广东工业大学 | Optical fiber distributed polarization crosstalk rapid measuring device based on optical frequency domain interference |
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