CN117168495B - Method and device for testing inter-axis crosstalk of optical chip for triaxial fiber optic gyroscope - Google Patents
Method and device for testing inter-axis crosstalk of optical chip for triaxial fiber optic gyroscope Download PDFInfo
- Publication number
- CN117168495B CN117168495B CN202310935623.7A CN202310935623A CN117168495B CN 117168495 B CN117168495 B CN 117168495B CN 202310935623 A CN202310935623 A CN 202310935623A CN 117168495 B CN117168495 B CN 117168495B
- Authority
- CN
- China
- Prior art keywords
- crosstalk
- signal
- optical chip
- digital quantity
- triaxial
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 83
- 238000012360 testing method Methods 0.000 title claims abstract description 83
- 239000000835 fiber Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 238000001914 filtration Methods 0.000 claims abstract description 27
- 239000013307 optical fiber Substances 0.000 claims description 15
- 238000004364 calculation method Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 9
- 108091006146 Channels Proteins 0.000 description 80
- 230000006872 improvement Effects 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
-
- 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
- G01C19/728—Assemblies for measuring along different axes, e.g. triads
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Manufacturing & Machinery (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Gyroscopes (AREA)
Abstract
The invention provides a method and a device for testing inter-axis crosstalk of an optical chip for a triaxial fiber optic gyroscope, wherein the method comprises the steps of constructing X-axis, Y-axis and Z-axis channels of the triaxial optical chip; determining one of the three channels as a test channel; applying a modulation signal to a Y waveguide of a test channel, and collecting a reference signal and a signal to be tested which are output by a triaxial optical chip detector; filtering the signal to be detected to eliminate the direct current component; performing correlation detection on the reference signal and the signal to be detected, and filtering to obtain crosstalk digital quantity; carrying out autocorrelation detection on the reference signal, and filtering to obtain autocorrelation digital quantity; and calculating crosstalk of the test channel to other two channels based on the crosstalk digital quantity and the autocorrelation digital quantity. The invention can rapidly obtain crosstalk among different channels, and is convenient for the design and detection of the triaxial optical chip.
Description
Technical Field
The invention belongs to the technical field of optical gyroscopes, and particularly relates to a method and a device for testing inter-axis crosstalk of an optical chip for a triaxial fiber optic gyroscope.
Background
Along with the development of technology and the expansion of the field, the interference type fiber optic gyroscope gradually develops towards miniaturization and low cost, and the miniaturization and low cost development of the traditional triaxial fiber optic gyroscope faces great challenges, and the main limiting factors are that the traditional triaxial fiber optic gyroscope light path comprises 11 discrete optical devices, up to 16 melting points and 16 sections of tail fibers to be processed, so that the middle-low precision triaxial fiber optic gyroscope has complex working procedures, large volume, high cost and low yield.
In recent years, integrated optical chips break through and are widely applied in the communication field, and a new idea is provided for realizing integration and miniaturization of the fiber optic gyroscope: the discrete optical device in the traditional triaxial fiber optic gyroscope is replaced by the integrated optical chip, the volume and the weight of the integrated optical chip are greatly reduced, and the cost and the power consumption are improved to a certain extent, so that the triaxial integrated fiber optic gyroscope becomes an important development direction of a gyroscope inertial device. The triaxial optical chip meeting the application requirements of the fiber-optic gyroscope has few reports, besides the restriction factors such as triaxial optical chip design and processing, the electrical crosstalk of a multichannel optical path at a detector end also severely restricts the gyroscope precision, and particularly, a X, Y, Z-axis PIN-FET receiving assembly on the triaxial optical chip is difficult to completely correspond to a crystal oscillator frequency division clock in actual work, so that voltage crosstalk is generated on a straight section of a Y/Z axis PIN-FET receiving assembly by spike pulses of the X-axis PIN-FET receiving assembly, and meanwhile, the Y, Z-axis PIN-FET receiving assembly also generates voltage crosstalk on the X/Z axis and the X/Y axis PIN-FET receiving assembly, so that the triaxial integrated fiber-optic gyroscope precision is seriously deteriorated. At present, for the inter-axis crosstalk of an optical chip for a triaxial fiber optic gyroscope, an effective inter-axis crosstalk testing method and device are not available except for setting up the gyroscope to perform precision testing, and the accuracy of the gyroscope is also limited by other factors. Therefore, it is highly desirable to provide a convenient and effective crosstalk testing method and device for solving the problem of crosstalk between axes of optical chips.
Disclosure of Invention
The invention aims to provide a method and a device for testing inter-axis crosstalk of an optical chip for a triaxial fiber optic gyroscope, which can rapidly obtain the crosstalk between different channels and facilitate the design and detection of the triaxial optical chip.
The technical scheme adopted by the invention is as follows:
the invention provides a method for testing inter-axis crosstalk of an optical chip for a triaxial fiber optic gyroscope, which comprises the following steps:
the triaxial optical chip is respectively communicated with 3 optical fiber rings through 3Y waveguides to form three channels corresponding to an X axis, a Y axis and a Z axis;
Determining one of the three channels as a test channel;
applying a modulation signal to a Y waveguide of a test channel, and collecting signals output by a test channel detector on a triaxial optical chip as reference signals and signals output by other two channel detectors as a first signal to be tested and a second signal to be tested;
the first signal to be detected and the second signal to be detected are respectively filtered to eliminate direct current components;
respectively carrying out correlation detection on the reference signal, the first signal to be detected and the second signal to be detected, and filtering to obtain crosstalk digital quantity;
carrying out autocorrelation detection on the reference signal, and filtering to obtain autocorrelation digital quantity;
and calculating the logarithm of the ratio of the crosstalk digital quantity to the autocorrelation digital quantity based on the crosstalk digital quantity and the autocorrelation digital quantity, and obtaining the crosstalk of the test channel to the other two channels.
According to the invention, the crosstalk influence of the test channel on other channels is detected by applying the modulation signal to the test channel, and the crosstalk between the optical chip axes is reflected by the quantified expression form, so that technicians can conveniently select the chip according to the crosstalk value to design, and the gyro precision is optimized.
Further, the modulating signal adopts sine wave signals, and the intuitiveness of crosstalk can be improved by reasonably adjusting the amplitude of the signals.
Further, the correlation detection is that two signals are multiplied, the autocorrelation detection is that the signals are multiplied, the low-pass filtering is adopted for the filtering after the correlation detection and the autocorrelation detection, and the high-frequency signals are removed.
Further, the modulation signal is applied in a differential modulation signal form, so that the signal anti-interference capability can be improved.
Further, the crosstalk calculation method comprises the following steps:
wherein κ M-N is the logarithmic crosstalk representation of channel M versus channel N;
C M-N is the crosstalk digital quantity of the channel M to the channel N;
c M-M is the channel M autocorrelation digital quantity;
The channels marked by M, N=1, 2 and 3, M noteq N, and 1,2 and 3 correspond to the X-axis, Y-axis and Z-axis channels of the triaxial optical chip respectively.
The invention also provides an inter-axis crosstalk testing device of the optical chip for the triaxial fiber optic gyroscope, which comprises a Y waveguide, an optical fiber ring and a crosstalk testing module; the 3 optical fiber rings are respectively connected with 1Y waveguide, and the 3Y waveguides are respectively connected with three tail fibers of the triaxial optical chip to be tested; the crosstalk testing module comprises 3 modulation signal output interfaces, 3 reference signal input interfaces, signal input interfaces to be tested and crosstalk signal output interfaces, wherein the 3 modulation signal output interfaces are respectively communicated with 3Y waveguides, the reference signal input interfaces and the signal input interfaces to be tested are respectively connected with one detector output end of the triaxial optical chip to be tested, and the crosstalk signal output interfaces output crosstalk information.
Further, the crosstalk testing module is used for carrying out correlation detection on the reference signal and the signal to be tested, filtering to obtain crosstalk digital quantity of the reference signal to the signal to be tested, carrying out autocorrelation detection on the reference signal, filtering to obtain autocorrelation digital quantity, and calculating crosstalk according to the crosstalk digital quantity and the autocorrelation digital quantity.
Further, the crosstalk testing module comprises
The modulation signal submodule is used for generating a modulation signal and outputting the modulation signal to one Y waveguide through a modulation signal output interface;
The channel selection submodule is used for determining a test channel of the triaxial optical chip to be tested;
The digital filtering sub-module is used for filtering the signal to be detected;
The signal demodulation sub-module is used for carrying out correlation detection on the reference signal and the signal to be detected, filtering to obtain crosstalk digital quantity of the reference signal to the signal to be detected, carrying out autocorrelation detection on the reference signal, and filtering to obtain autocorrelation digital quantity;
The crosstalk calculation sub-module is used for calculating crosstalk values according to the crosstalk digital quantity and the autocorrelation digital quantity, outputting crosstalk information and outputting the crosstalk information to the crosstalk signal output interface.
Further, the crosstalk testing module further comprises a power supply control sub-module, which is used for supplying power to the crosstalk testing module;
the channel selection sub-module determines a test channel through a preset test flow or a set instruction.
Further, during testing, the triaxial optical chip to be tested works in a standard working state and can be realized by adopting a conventional means. In order to simplify the test operation, the optical chip inter-axis crosstalk test device for the triaxial fiber optic gyroscope further comprises a voltage-stabilizing direct current power supply and a light source driving/temperature control module, wherein the voltage-stabilizing direct current power supply supplies power to a PIN-FET receiving assembly of the triaxial optical chip to be tested, the light source driving/temperature control module is used for SLD light source driving and temperature control of the triaxial optical chip to be tested, and the working state of the triaxial optical chip is controlled by communicating the voltage-stabilizing direct current power supply, the light source driving/temperature control module and PINs of the triaxial optical chip to be tested.
Further, the working wave band of the optical fiber ring is the same as that of the triaxial optical chip to be tested, and the testing device can be used for batch detection of the triaxial optical chip.
Compared with the prior art, the invention has the beneficial effects that:
Aiming at the outstanding problem that the inter-axis crosstalk of a triaxial optical chip severely restricts the performance improvement of a gyroscope, the invention provides a crosstalk testing method and device based on signal generation, detection and calculation. By designing inter-axis crosstalk demodulation software and hardware in the device, the crosstalk between different channels can be rapidly obtained, and a foundation is laid for design improvement of a triaxial optical chip and practical development of a triaxial integrated fiber optic gyroscope.
The inter-axis crosstalk of the triaxial optical chip is characterized by adopting logarithms, so that the relative crosstalk size can be accurately identified instead of the absolute value, and an accurate reference standard is laid for the design optimization and improvement of the later-stage optical chip.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a triaxial optical chip inter-axis crosstalk testing apparatus according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a crosstalk testing module according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an inter-axis crosstalk test principle of a triaxial optical chip according to an embodiment of the present invention.
Detailed Description
The invention will now be described in detail with reference to the drawings and examples.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, are intended to be within the scope of the present invention, based on the embodiments herein.
The invention provides a method for testing inter-axis crosstalk of an optical chip for a triaxial fiber optic gyroscope, which comprises the following steps:
the triaxial optical chip is respectively communicated with 3 optical fiber rings through 3Y waveguides to form three channels corresponding to an X axis, a Y axis and a Z axis;
Determining one of the three channels as a test channel;
applying a modulation signal to a Y waveguide of a test channel, and collecting signals output by a test channel detector on a triaxial optical chip as reference signals and signals output by other two channel detectors as a first signal to be tested and a second signal to be tested;
the first signal to be detected and the second signal to be detected are respectively filtered to eliminate direct current components;
respectively carrying out correlation detection on the reference signal, the first signal to be detected and the second signal to be detected, and filtering to obtain crosstalk digital quantity;
carrying out autocorrelation detection on the reference signal, and filtering to obtain autocorrelation digital quantity;
and calculating the logarithm of the ratio of the crosstalk digital quantity to the autocorrelation digital quantity based on the crosstalk digital quantity and the autocorrelation digital quantity, and obtaining the crosstalk of the test channel to the other two channels.
According to the invention, the crosstalk influence of the test channel on other channels is detected by applying the modulation signal to the test channel, and the crosstalk between the optical chip axes is reflected by the quantified expression form, so that technicians can conveniently select the chip according to the crosstalk value to design, and the gyro precision is optimized.
The invention also provides an inter-axis crosstalk testing device of the optical chip for the triaxial fiber optic gyroscope, which comprises a Y waveguide, an optical fiber ring and a crosstalk testing module; the 3 optical fiber rings are respectively connected with 1Y waveguide, and the 3Y waveguides are respectively connected with three tail fibers of the triaxial optical chip to be tested; the crosstalk testing module comprises 3 modulation signal output interfaces, 3 reference signal input interfaces, signal input interfaces to be tested and crosstalk signal output interfaces, wherein the 3 modulation signal output interfaces are respectively communicated with 3Y waveguides, the reference signal input interfaces and the signal input interfaces to be tested are respectively connected with one detector output end of the triaxial optical chip to be tested, and the crosstalk signal output interfaces output crosstalk information.
Aiming at the outstanding problem that the inter-axis crosstalk of a triaxial optical chip severely restricts the performance improvement of a gyroscope, the invention provides a crosstalk testing method and device based on signal generation, detection and calculation. By designing inter-axis crosstalk demodulation software and hardware in the device, the crosstalk between different channels can be rapidly obtained, and a foundation is laid for design improvement of a triaxial optical chip and practical development of a triaxial integrated fiber optic gyroscope.
Taking the example of testing the crosstalk influence of the X-axis channel on the Y/Z-axis channel, the above technical scheme will be described in detail.
In this embodiment, the overall structure of the optical chip inter-axis crosstalk testing device for a triaxial fiber optic gyroscope is shown in fig. 1, and mainly includes an optical path unit and a circuit unit, wherein the pin definition of the triaxial optical chip is shown in table 1. The optical path unit comprises a triaxial optical chip with tail fiber output, 3Y waveguides and 3 optical fiber rings. The three-axis optical chip realizes three-channel light coupling and detection functions and specifically comprises three parts, namely an SLD light source, a PIN/FET light receiving assembly and a multi-axis coupler, wherein the SLD light source is used for outputting light, the PIN/FET light receiving assembly is used for detecting light of three-axis channels, and the multi-axis coupler is used for coupling the light of the three-axis channels; the Y waveguide realizes the functions of polarization, coupling and phase modulation of light; the optical fiber ring realizes the function of angular velocity sensitivity. The circuit unit comprises a voltage-stabilizing direct-current power supply, a light source driving/temperature control module and a crosstalk testing module; the stabilized DC power supply is used for supplying power to the PIN/FET light receiving component + -5V, and the light source driving/temperature control module is used for driving and controlling the temperature of the SLD light source part so as to realize stable light power output; the crosstalk testing module is mainly used for achieving functions of modulation signal generation, inter-axis crosstalk signal demodulation, crosstalk data output and the like.
The main connection relations are as follows: the +5V, -5V and ground interface of the stabilized DC power supply are respectively connected with PINs 1, 2 and 3 of the triaxial optical chip to supply power to the PIN/FET light receiving component; the temperature control interface of the light source driving/temperature control module is connected with pins 4, 5, 6 and 7 of the triaxial optical chip, the pins 4 and 5 are the negative pole and the positive pole of the thermal refrigerator, the pins 6 and 7 are thermistors, the driving interface is connected with pins 8 and 9 of the triaxial optical chip, and the pins 8 and 9 are the positive pole and the negative pole of the SLD; the differential modulation signal interface 1 of the crosstalk test module is connected with two electrodes of the Y waveguide 1, the differential modulation signal interface 2 is connected with two electrodes of the Y waveguide 2, the differential modulation signal interface 3 is connected with two electrodes of the Y waveguide 3, the GND interface is connected with the GND interface of the stabilized DC power supply, the reference signal port and the signal port to be tested are respectively connected with the output of the interference test channel detector and the output of the interfered channel detector of the triaxial optical chip, and in fig. 1, the crosstalk of the X-axis PIN-FET receiving assembly to the Y-axis PIN-FET receiving assembly is taken as an example, and the reference signal port and the signal port to be tested are respectively connected with the 12 feet PD1 and the 13 feet PD2. The triaxial optical chip pins 10 and 11 are suspended.
TABLE 1 triaxial optical chip pin definition
| Pin | Electrical definition | Pin | Electrical definition |
| 1 | +5V | 8 | SLD+ |
| 2 | －5V | 9 | SLD－ |
| 3 | GND | 10 | Suspending (NC) |
| 4 | TEC－ | 11 | Shell and shell |
| 5 | TEC+ | 12 | PD1 |
| 6 | Thermistor RT1 | 13 | PD2 |
| 7 | Thermistor RT2 | 14 | PD3 |
The light source driving/temperature controlling module may be formed by using the prior art, and reference may be made to an integrated light source driving circuit and optical fiber gyro (CN 202222006605.4), a light source driving circuit and optical fiber gyro (CN 202120841247.1), etc.
The specific structure of the inter-axis crosstalk testing module is shown in fig. 2, and the specific structure and function are described as follows:
The power supply control module realizes the conversion from an external power supply to an internal power supply so as to realize the power supply of the whole crosstalk testing module; the modulation signal module realizes the generation of a modulation signal, specifically, outputs a 1V peak-to-peak value and a 100kHz frequency sine wave, then the modulation signal enters the channel selection module, the channel selection module receives an external channel setting instruction and inputs the instruction into the channel selection module, if the channel selection module is not set, the channel selection module defaults to test the crosstalk of the channel 1 (X axis) to other channels firstly, and secondly, the channel selection module transmits the crosstalk of the channel 2 (Y axis) and the channel 3 (Z axis) to other channels, and meanwhile, the channel information selected at present is transmitted to the crosstalk calculation module to serve as a channel identifier; in the crosstalk information generation link, mainly the process of carrying out relevant detection on a reference signal and a signal to be detected, the signal to be detected firstly enters a crosstalk channel selection module, which channel is tested for crosstalk to other channels is established according to channel information, and the signal to be detected firstly passes through a digital filtering module to eliminate the influence of direct current components. The method comprises the steps of carrying out digital correlation detection on a reference signal and a signal to be detected in a signal demodulation module, obtaining crosstalk digital quantity of the reference signal to the signal to be detected through low-pass filtering, obtaining autocorrelation digital quantity of the reference signal according to the reference signal, inputting the crosstalk digital quantity and the autocorrelation digital quantity into a crosstalk calculation module, carrying out mathematical operation (a specific operation process is shown in a formula (5)), obtaining a crosstalk value, and outputting crosstalk information (comprising the crosstalk value and channel information) to an external interface, thereby realizing crosstalk measurement among different channels.
The principle of the chip inter-axis crosstalk test is shown in fig. 3:
By applying the modulated signal to 1 of the three-axis optical chip (taking X-axis Y waveguide 1 as an example), the sinusoidal signal shown in fig. 2 is generated on PD1 of the PIN-FET receiving component of the modulated signal loading channel, and the unavoidable crosstalk reaches PD2 and PD3, specifically, the signal crosstalk 1 and the signal crosstalk 2 are illustrated, and the strength of the PD1 signal of the loading channel is expressed as:
VPD1＝VrSin(ωrt+θr) (1)
wherein V r is the reference signal strength amplitude, ω r is the reference signal frequency, and θ r is the reference signal phase.
The PD2 signal acts as a crosstalk signal, whose strength is expressed as:
VPD2＝VsigSin(ωsigt+θsig) (2)
where V sig is the crosstalk signal strength amplitude, ω sig is the crosstalk signal frequency, and θ sig is the crosstalk signal phase.
The two signals are multiplied in a digital correlation detection module to obtain two alternating current signals with frequencies (omega r+ωsig) and (omega r-ωsig) respectively.
Due to omega r＝ωsig. Thus, when the signal passes through the low pass filter, a direct current signal is obtained:
Therefore, through digital correlation detection, detection of the crosstalk value of the reference pair signal crosstalk can be realized, namely the inter-axis crosstalk test principle.
The chip inter-axis crosstalk testing method comprises the following steps:
S1, according to FIG. 1, connecting a light source driving/temperature control module, a voltage-stabilizing direct current power supply and a crosstalk testing module with an optical chip and an optical path for a triaxial fiber optic gyroscope;
S2, powering on a voltage-stabilizing direct-current power supply, enabling the control temperature to be 25+/-0.1 ℃ through a temperature control pin (4-7 pins) of the SLD light source, and applying working current I F to be 100 mA+/-0.1 mA through driving current pins (8 and 9 pins) of the SLD light source;
S3, the crosstalk testing module loads the Y waveguide 1 modulation signal and outputs a 1V peak-to-peak value and a 100kHz frequency sine wave, and at the moment, the signal demodulation module outputs crosstalk digital quantities of C 1-2、C1-3 according to the internal channel switching sequence, namely the crosstalk of the channel 1 to the channel 2 and the channel 3;
s4, the crosstalk testing module realizes the autocorrelation digital quantity C 1-1 of the reference signal;
S5, switching to a2 nd channel, and repeating the steps S3-S4 to realize the crosstalk test of the channel 2 on the channels 1 and 3;
s6, switching to a 3 rd channel, and repeating the steps S3-S4 to realize the crosstalk test of the channel 3 on the channel 1 and the channel 3;
S7, calculating logarithmic representation of channel crosstalk according to a formula (1):
wherein:
Kappa M-N -logarithmic representation of the crosstalk of channel M to channel N in dB;
C M-N -the amount of crosstalk digital of channel M to channel N;
C M-M -channel M autocorrelation digital quantity.
By judging whether the crosstalk amount meets the set threshold value, whether the triaxial optical chip meets the design requirement can be judged.
Features that are described and/or illustrated above with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.
The many features and advantages of the embodiments are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of the embodiments which fall within the true spirit and scope thereof. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the embodiments of the invention to the exact construction and operation illustrated and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope thereof.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
The invention is not described in detail in a manner known to those skilled in the art.
Claims (9)
1. The method for testing the inter-axis crosstalk of the optical chip for the triaxial fiber optic gyroscope is characterized by comprising the following steps of
The triaxial optical chip is respectively communicated with 3 optical fiber rings through 3Y waveguides to form three channels corresponding to an X axis, a Y axis and a Z axis;
Determining one of the three channels as a test channel;
applying a modulation signal to a Y waveguide of a test channel, and collecting signals output by a test channel detector on a triaxial optical chip as reference signals and signals output by other two channel detectors as a first signal to be tested and a second signal to be tested;
The first signal to be detected and the second signal to be detected are respectively filtered to eliminate direct current components;
respectively carrying out correlation detection on the reference signal, the first signal to be detected and the second signal to be detected, and filtering to obtain crosstalk digital quantity;
carrying out autocorrelation detection on the reference signal, and filtering to obtain autocorrelation digital quantity;
Based on the crosstalk digital quantity and the autocorrelation digital quantity, calculating the crosstalk of the test channel to other two channels, wherein the crosstalk calculating method comprises the following steps:
wherein κ M-N is the logarithmic crosstalk representation of channel M versus channel N;
C M-N is the crosstalk digital quantity of the channel M to the channel N;
c M-M is the channel M autocorrelation digital quantity;
M,N＝1、2、3，M≠N。
2. The method of claim 1, wherein the modulated signal is a sine wave signal and the modulated signal is applied to the Y-waveguide in a differential form.
3. The method according to claim 1, wherein the correlation detection is multiplication, the autocorrelation detection is self multiplication, and the filtering after the correlation detection and the autocorrelation detection is low-pass filtering.
4. An optical chip inter-axis crosstalk testing device for a triaxial fiber optic gyroscope is characterized in that the optical chip inter-axis crosstalk testing method according to claims 1-3 is adopted, and the optical chip inter-axis crosstalk testing device comprises a Y waveguide, an optical fiber ring and a crosstalk testing module; the 3 optical fiber rings are respectively connected with 1Y waveguide, and the 3Y waveguides are respectively connected with three tail fibers of the triaxial optical chip to be tested; the crosstalk testing module comprises 3 modulation signal output interfaces, 3 reference signal input interfaces, signal input interfaces to be tested and crosstalk signal output interfaces, wherein the 3 modulation signal output interfaces are respectively communicated with 3Y waveguides, the reference signal input interfaces and the signal input interfaces to be tested are respectively connected with one detector output end of the triaxial optical chip to be tested, and the crosstalk signal output interfaces output crosstalk information.
5. The device according to claim 4, wherein the crosstalk testing module further comprises means for performing correlation detection of the reference signal and the signal to be tested, means for performing filtering to obtain a crosstalk digital quantity of the reference signal to the signal to be tested, means for performing autocorrelation detection of the reference signal, means for performing filtering to obtain an autocorrelation digital quantity, and means for calculating crosstalk according to the crosstalk digital quantity and the autocorrelation digital quantity.
6. The optical chip inter-axis crosstalk testing apparatus according to claim 4, wherein said crosstalk testing module comprises
A modulation signal sub-module for generating a modulation signal;
The channel selection submodule is used for determining a test channel of the triaxial optical chip to be tested;
The digital filtering sub-module is used for filtering the signal to be detected;
The signal demodulation sub-module is used for carrying out correlation detection on the reference signal and the signal to be detected, filtering to obtain crosstalk digital quantity of the reference signal to the signal to be detected, carrying out autocorrelation detection on the reference signal, and filtering to obtain autocorrelation digital quantity;
And the crosstalk calculation sub-module is used for calculating crosstalk values according to the crosstalk digital quantity and the autocorrelation digital quantity and outputting crosstalk information.
7. The optical chip inter-axis crosstalk testing apparatus according to claim 6, wherein said crosstalk testing module further comprises a power control sub-module for supplying power to the crosstalk testing module;
The channel selection submodule determines a test channel through a preset test flow or a set instruction.
8. The device of claim 4, further comprising a regulated dc power supply for powering the PIN-FET receiving assembly of the triaxial optical chip to be tested, and a light source driving/temperature control module for SLD light source driving and temperature control of the triaxial optical chip to be tested.
9. The device of claim 4, wherein the optical fiber loop has an operating band identical to that of the triaxial optical chip to be tested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310935623.7A CN117168495B (en) | 2023-07-27 | 2023-07-27 | Method and device for testing inter-axis crosstalk of optical chip for triaxial fiber optic gyroscope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310935623.7A CN117168495B (en) | 2023-07-27 | 2023-07-27 | Method and device for testing inter-axis crosstalk of optical chip for triaxial fiber optic gyroscope |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117168495A CN117168495A (en) | 2023-12-05 |
| CN117168495B true CN117168495B (en) | 2024-05-03 |
Family
ID=88930821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310935623.7A Active CN117168495B (en) | 2023-07-27 | 2023-07-27 | Method and device for testing inter-axis crosstalk of optical chip for triaxial fiber optic gyroscope |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117168495B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271147A (en) * | 2017-06-14 | 2017-10-20 | 北京航空航天大学 | A kind of optical fibre gyro is distributed polarization interference data processing method with polarization-maintaining fiber coil |
| CN110319826A (en) * | 2019-06-24 | 2019-10-11 | 北京控制工程研究所 | Optical fibre gyro staircase waveform cross talk restraining method based on adaptive-filtering |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011153018A2 (en) * | 2010-06-01 | 2011-12-08 | Luna Innovations Incorporated | Interferometric measurement with crosstalk suppression |
-
2023
- 2023-07-27 CN CN202310935623.7A patent/CN117168495B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271147A (en) * | 2017-06-14 | 2017-10-20 | 北京航空航天大学 | A kind of optical fibre gyro is distributed polarization interference data processing method with polarization-maintaining fiber coil |
| CN110319826A (en) * | 2019-06-24 | 2019-10-11 | 北京控制工程研究所 | Optical fibre gyro staircase waveform cross talk restraining method based on adaptive-filtering |
Non-Patent Citations (3)
| Title |
|---|
| 光学相干域偏振测量技术及其在高精度光纤陀螺器件测量中的应用;杨军 等;光学学报;20180116;第38卷(第3期);全文 * |
| 基于时分复用技术的三轴光纤陀螺光路噪声及抑制技术研究;王淑香 等;光学与光电技术;20120810;第10卷(第4期);全文 * |
| 小型化高精度光纤陀螺的检测电路串扰自检测;陈和宇;郑月;孔令海;孟照魁;;中国激光;20191008;第47卷(第1期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117168495A (en) | 2023-12-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111174773B (en) | Multi-phase modulation and demodulation fiber-optic gyroscope multi-closed-loop algorithm | |
| CN101408426B (en) | Method for enlarging optical fiber gyroscope range | |
| EP2857796B1 (en) | Methods and apparatus of tracking/locking resonator free spectral range and its application in resonator fiber optic gyroscope | |
| US11415417B2 (en) | Cavity optomechanical vibratory gyroscope | |
| CN103115628B (en) | A kind of resonant mode optical gyroscope scale factor method of testing | |
| EP2741050A1 (en) | Optical frequency comb stimulated brillouin scattering gyroscope | |
| CN102445198B (en) | Alternating-current frequency stabilization system and method for four-frequency laser gyroscope | |
| CN109990773A (en) | A kind of detection of interference optical fiber top loop gain and closed-loop control system and control method | |
| CN117168495B (en) | Method and device for testing inter-axis crosstalk of optical chip for triaxial fiber optic gyroscope | |
| CN103267522B (en) | The two-way frequency locking switching method of microwave gyroscope irreplaceable error is carried for eliminating light | |
| CN105758421A (en) | Fiber-optic gyroscope eigenfrequency measuring equipment and application thereof | |
| EP3875903B1 (en) | Bidirectional optical-carrying microwave resonance system based on circulator structure and method for detecting angular velocity by said system | |
| CN114383590A (en) | Phase error identification and compensation method of rate integral gyroscope | |
| CN101509772B (en) | Optical phase detecting high precision silicon microelectromechanical gyroscope | |
| CN103868530A (en) | Method for testing closed-loop fiber-optic gyroscope angular acceleration tracking performance | |
| CN113242039B (en) | Purifying device for optical fiber optical frequency transmission signal | |
| CN111796540B (en) | High-locking-precision bias control circuit system of electro-optical modulator | |
| CN109974682A (en) | A kind of three axis optical fiber top modulation-demodulation device of microminiature | |
| CN108444464A (en) | A kind of light source relative intensity noise suppressing method in fibre optic gyroscope | |
| CN102305629B (en) | Inertial measurement system based on high-integration-level accelerometer | |
| CN109579821A (en) | A kind of fibre optic gyroscope based on dual wavelength multiplexing structure | |
| JP2504747B2 (en) | Method and apparatus for aligning optical axis between semiconductor element and optical transmission line | |
| CN116878394B (en) | Interference displacement measurement system and method for polarized light phase modulation of microprobe | |
| CN102759634B (en) | Closed loop control interference type optical fiber accelerometer | |
| RU2152001C1 (en) | Fiber-optical gyroscope |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |