CN118190350A - Y-waveguide photoelectric aging system and method - Google Patents
Y-waveguide photoelectric aging system and method Download PDFInfo
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- CN118190350A CN118190350A CN202410613713.9A CN202410613713A CN118190350A CN 118190350 A CN118190350 A CN 118190350A CN 202410613713 A CN202410613713 A CN 202410613713A CN 118190350 A CN118190350 A CN 118190350A
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- 230000032683 aging Effects 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000013307 optical fiber Substances 0.000 claims abstract description 54
- 230000003287 optical effect Effects 0.000 claims abstract description 44
- 238000010438 heat treatment Methods 0.000 claims abstract description 39
- 238000012360 testing method Methods 0.000 claims abstract description 11
- 238000002955 isolation Methods 0.000 claims abstract description 4
- 230000004927 fusion Effects 0.000 claims description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000003466 welding Methods 0.000 description 8
- 230000010287 polarization Effects 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 5
- 230000005693 optoelectronics Effects 0.000 description 5
- 239000000835 fiber Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 206010069808 Electrical burn Diseases 0.000 description 2
- 206010051246 Photodermatosis Diseases 0.000 description 2
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008845 photoaging Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006353 environmental stress Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
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- 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
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- G—PHYSICS
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- 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
- G01C19/721—Details
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
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Abstract
The invention discloses a Y waveguide photoelectric aging system in the field of optical element test devices, which comprises: the laser generator is used for generating a laser light source; the input end of the optical isolator is connected with the output end of the laser generator, the optical isolator is used for realizing unidirectional isolation on a laser light source emitted by the laser generator, the output end of the optical isolator is connected with a single input optical fiber of the Y waveguide, and the free ends of two output optical fibers of the Y waveguide are connected with a shaft; the heating device is used for providing a high-temperature environment for the Y waveguide; the signal generator provides an electrical signal to the Y waveguide; a photoelectric aging method; the beneficial effects of the invention are as follows: by arranging the photoelectric aging device to perform photoelectric aging on the Y waveguide, the use environment of the Y waveguide in the fiber-optic gyroscope can be more accurately simulated compared with the existing photoelectric aging device, the accelerated aging of the Y waveguide before use can be performed, and the problem of scale factor drift of the fiber-optic gyroscope can be effectively solved.
Description
Technical Field
The invention relates to the technical field of optical element test devices, in particular to a Y-waveguide photoelectric aging system and a Y-waveguide photoelectric aging method.
Background
The electric aging is a process for performing special electric performance treatment on the electronic components, and has the function of removing natural aging substances in the components, thereby improving the performance and reliability of the components and prolonging the service life. The photoelectric aging is an accelerated aging method specific to the optoelectronic components, and is different from the electric aging in that the photoelectric aging not only needs to apply electric signals to the optoelectronic components, but also needs to apply optical signals at the same time.
The lithium niobate Y waveguide electro-optic phase modulator (Y waveguide for short) is an optoelectronic device special for the fiber-optic gyroscope, and plays the roles of polarization/polarization detection, light splitting/light combining and phase modulation in the fiber-optic gyroscope. The Y waveguide consists of a lithium niobate chip, a polarization maintaining optical fiber, a metal tube shell, gold wires, glue auxiliary materials and the like, and the optical fiber gyro industry generally considers that the Y waveguide does not contain natural aging substances or the natural aging of the Y waveguide does not influence the performance of the optical fiber gyro, so that the environmental stress screening test item before delivery does not contain a photoelectric aging test. Even for checking the long-term life of the Y waveguide, the industry generally adopts a pure aging method to carry out a steady-state life test, namely the Y waveguide is placed in a high temperature box at 85 ℃, square wave or triangular wave signals of +/-5V are continuously applied to signal pins, and the specific method is described in the paper "the application environment adaptability study of the space of the optoelectronic device for 1310nm interference type optical fiber gyro" section 4.4.4 "the accelerated life prediction of the Y waveguide integrated optical device".
When the long-term service life of the Y waveguide is evaluated, experiments show that after long-time accelerated aging, the half-wave voltage of the Y waveguide has obvious increase phenomenon, and other main performance indexes (such as insertion loss, splitting ratio and tail fiber polarization crosstalk) basically remain unchanged or fluctuate within a certain range. More importantly, the result of half-wave voltage increase caused by photo-and pure-aging is significantly different: under the conditions of the same temperature and the same modulation signal application, the half-wave voltage degradation speed caused by photoelectric aging is faster than that of pure aging, after the pure aging time is 1000 hours, the half-wave voltage change rate is between 1 and 2 percent, and the half-wave voltage is still increased along with the lengthening of the time; after the photo-aging is carried out for 336 hours, the half-wave voltage change rate is between 1 and 2.5 percent, and the half-wave voltage is basically unchanged along with the lengthening of the aging time.
The change of half-wave voltage of the Y waveguide at normal temperature can cause the scale factor of the fiber-optic gyroscope to drift, which can cause the following problems in use: the calibration test of the scale factor is carried out on the turntable before the optical fiber gyroscope leaves the factory, after the optical fiber gyroscope leaves the factory and is delivered to a user for a period of time, the half-wave voltage of the Y waveguide is slowly increased, the scale factor is gradually reduced, the output value of the gyroscope at a large rotating speed is smaller than the actual angular speed, and the accuracy of the inertial navigation system is reduced. Therefore, in the occasion that the long-term stability of the scale factor of the fiber-optic gyroscope has higher requirement, photoelectric aging is necessary to be carried out on the Y waveguide before delivery, so that the problem of the drift of the scale factor of the Y waveguide is solved.
Therefore, we propose a Y waveguide photoelectric aging system and method.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a Y waveguide photoelectric aging system and a Y waveguide photoelectric aging method.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
A Y-waveguide optoelectric burn-in system comprising: laser generator: for generating a laser light source; an optical isolator: the input end is connected with the output end of the laser generator, the optical isolator is used for realizing unidirectional isolation on a laser light source emitted by the laser generator, the output end of the optical isolator is connected with a single input optical fiber of the Y waveguide, and the free ends of two output optical fibers of the Y waveguide are connected with a shaft; heating device: for providing a high temperature environment for the Y waveguide; a signal generator: is connected with the signal pin of the Y waveguide and provides an electrical signal to the Y waveguide.
By arranging the laser generator as an optical signal source for photoelectrically aging the Y waveguide, the signal generator is used as an electrical signal source for photoelectrically aging the Y waveguide, the photoelectrically aging is adopted for accelerated aging of the Y waveguide before delivery, so that the Y waveguide is fully accelerated aged before the optical fiber gyro is assembled, the half-wave voltage of the Y waveguide is high in stability and cannot drift gradually along with the increase of the service time in the use process of the optical fiber gyro, the problems that the scale factor of the optical fiber gyro slowly drifts due to the increase of the half-wave voltage in use and angular velocity measurement errors are generated under a large rotating speed so as to reduce the precision of an inertial navigation system can be avoided, the actual use environment of the Y waveguide can not be simulated by the conventional photoelectrically aging device, the actual use environment of the Y waveguide can be well simulated, and the accelerated aging of the Y waveguide before the use can be realized by the device.
Further limited, the heating device is a long heating plate, and the Y waveguide is arranged on the heating plate to realize heating; the heating device is arranged into a long strip-shaped heating plate, the heating plate is used as a high-temperature heat source, when the high-temperature oven is used, the optical fiber is suspended in the oven to be pulled out of a fan, so that the Y waveguide tail fiber drifts back and forth in the oven, the potential risk of damaging the optical fiber in the photoelectric aging process is eliminated, the occupied space volume of the heating plate is smaller than that of the oven, and the whole set of photoelectric aging device is smaller.
Further limited, the output end of the optical isolator is connected with a beam splitter, the beam splitter is used for splitting the laser beam generated by the laser generator and output by the optical isolator into a plurality of beams, a plurality of Y waveguides are uniformly arranged on the heating device at intervals, and each output end of the beam splitter is connected with an input optical fiber of one Y waveguide; the beam splitter is arranged to split the laser beam into a plurality of beams, so that photoelectric aging of a plurality of Y waveguides can be performed simultaneously, and the efficiency is improved.
Further defined, the laser generator is connected with the optical isolator, the optical isolator is connected with the beam splitter, the beam splitter is connected with the input optical fibers of the Y waveguide, and the free ends of the two output optical fibers of the Y waveguide are respectively connected in an optical fiber fusion mode.
The photoelectric aging method adopts the Y-waveguide photoelectric aging system and comprises the following steps:
s1: placing and fixing the Y waveguide to be photoelectrically aged on a heating plate;
S2: the optical path connection is carried out, the input end of the optical isolator is connected with the output end of the laser generator in an optical fiber welding mode, the output end of the optical isolator is connected with the input end of the beam splitter in an optical fiber welding mode, each output end of the beam splitter is connected with the input end of one Y waveguide in an optical fiber welding mode, and finally the free ends of two output optical fibers of the Y waveguide are subjected to shaft welding;
s3: the circuit is connected with the output end of the signal generator through a signal wire and is connected with a pair of signal pins of the Y waveguide;
S4: the photoelectric aging test is carried out, and the power of a laser generator is adjusted to enable the output light power of a beam splitter to be close to the actual value of the light power of the input Y waveguide in the working state of the fiber-optic gyroscope; setting a signal generator to generate square wave or triangular wave signals with specified amplitude and specified frequency, and inputting the square wave or triangular wave signals to a signal pin of the Y waveguide;
s5: the heating plate is turned on, the target temperature T is set, and the laser generator and the signal generator are turned on for h hours.
The method is characterized in that two output polarization maintaining optical fibers of the Y waveguide to be photoelectrically aged are subjected to shaft fusion, at the moment, light source light is input from the tail optical fiber of the Y waveguide, the light is transmitted in a closed loop formed by the two output optical fibers of the Y waveguide and then returns to the Y waveguide, and the light is combined and then returns to the input optical fiber.
Further limited, in the step S4, the beam splitter outputs a square wave signal with the optical power of 100uw-1000uw, the frequency of the electric wave signal of the signal generator is 1kHz, and the amplitude is +/-5V.
Further limited, in the step S5, T is not less than 82 ℃ and not more than 88 ℃, and in the step S5, h is not less than 96.
The beneficial effects of the invention are as follows: by arranging the photoelectric aging device to perform photoelectric aging on the Y waveguide, the use environment of the Y waveguide in the fiber-optic gyroscope can be more accurately simulated compared with the existing photoelectric aging device, the accelerated aging of the Y waveguide before use can be performed, and the problem of scale factor drift of the fiber-optic gyroscope can be effectively solved.
Drawings
FIG. 1 is a schematic diagram of the connection of the present invention;
FIG. 2 is a graph of half-wave voltage of a Y waveguide over time in an electrical burn-in experiment;
FIG. 3 is a graph of the relative rate of change of half-wave voltage of the Y waveguide over time in an electrical burn-in experiment;
FIG. 4 is a graph of half-wave voltage of a Y waveguide over time in a photoelectric burn-in experiment;
Fig. 5 is a graph of the relative rate of change of half-wave voltage of the Y waveguide over time in an optoelectronics burn-in experiment.
Wherein the reference numerals of the components are as follows:
a laser generator 1, an optical isolator 2, a beam splitter 3, a heating device 4, a signal generator 5 and a Y waveguide 6.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
Examples:
As shown in fig. 1-5, a Y waveguide photoelectric aging system comprises a laser generator 1, an optical isolator 2, a beam splitter 3, a heating device 4 and a signal generator 5; the laser generator 1 is used for generating a laser light source; the input end of the optical isolator 2 is connected with the output end of the laser generator 1, the optical isolator 2 is used for realizing unidirectional isolation on a laser source emitted by the laser generator 1, the output end of the optical isolator 2 is connected with a single input optical fiber of the Y waveguide 6, and the free ends of two output optical fibers of the Y waveguide 6 are connected with a shaft; the beam splitter 3 is connected to the output end of the optical isolator 2, the beam splitter 3 is used for splitting the laser beam generated by the laser generator 1 and output by the optical isolator 2 into a plurality of beams, a plurality of Y waveguides 6 are uniformly arranged on the heating plate at intervals, and each output end of the beam splitter 3 is connected with an input optical fiber of one Y waveguide 6; the heating device 4 is used for providing a high-temperature environment for the Y waveguide 6, the heating device 4 is a long-strip heating plate, and the Y waveguide 6 is arranged on the heating plate to realize heating; the signal generator 5 is connected with a signal pin of the Y waveguide 6 and provides an electric signal for the Y waveguide 6; the laser generator 1 is connected with the optical isolator 2, the optical isolator 2 is connected with the beam splitter 3, the beam splitter 3 is connected with the input optical fibers of the Y waveguide 6, and the free ends of the two output optical fibers of the Y waveguide 6 are respectively connected in an optical fiber fusion mode.
By arranging the laser generator 1 as an optical signal source for photoelectrically aging the Y waveguide 6, the signal generator 5 as an electrical signal source for photoelectrically aging the Y waveguide 6, and adopting photoelectrically aging the Y waveguide 6 before leaving the factory, the Y waveguide 6 has completed full accelerated aging before assembling the fiber-optic gyroscope, the half-wave voltage stability of the Y waveguide 6 is high and can not drift gradually along with the increase of the service time in the use process of the fiber-optic gyroscope, the problems that the scale factor of the fiber-optic gyroscope slowly drifts due to the increase of the half-wave voltage of the Y waveguide 6 in use, angular velocity measurement errors are generated under high rotating speed and the precision of an inertial navigation system is reduced can be avoided, the conventional electrical aging device can not simulate the actual use environment of the Y waveguide 6, the photoelectric aging of the Y waveguide 6 can be well simulated by the device, and the accelerated aging before the use of the Y waveguide 6 can be realized; the heating device 4 is arranged into a long strip-shaped heating plate, the heating plate is used as a high-temperature heat source, when a high-temperature oven is used, optical fibers are prevented from being suspended in the oven to pull out a fan, so that tail fibers of the Y waveguide 6 drift back and forth in the oven, the potential risk of damaging the optical fibers in the photoelectric aging process is eliminated, the occupied space of the heating plate is smaller than that of the oven, and the whole set of photoelectric aging device is smaller in size, in addition, compared with a closed oven, the heating plate is an open type device, and is more convenient to connect the optical fibers of the Y waveguide 6 with signal pins; by arranging the beam splitter 3 to split the laser beam into a plurality of beams, photoelectric aging of a plurality of Y waveguides 6 can be performed simultaneously, and the efficiency is improved.
The photoelectric aging method adopts the Y-waveguide photoelectric aging system and comprises the following steps:
s1: placing and fixing the Y waveguide 6 to be photoelectrically aged on a heating plate;
S2: the optical path connection, the input end of the optical isolator 2 is connected with the output end of the laser generator 1 in an optical fiber welding mode, then the output end of the optical isolator 2 is connected with the input end of the beam splitter 3 in an optical fiber welding mode, each output end of the beam splitter 3 is connected with the input end of one Y waveguide 6 in an optical fiber welding mode, and finally the free ends of two output optical fibers of the Y waveguide 6 are subjected to the axial welding;
S3: the circuit is connected with the output end of the signal generator 5 through a signal wire and a pair of signal pins of the Y waveguide 6;
s4: the photoelectric aging test is carried out, and the power of the laser generator 1 is adjusted to enable the output light power of the beam splitter 3 to be 180uw-220uw so as to simulate the power of the conventional optical fiber gyroscope commonly used in the market; a signal generator 5 is set to generate square wave signals with the amplitude of +/-5V and the frequency of 1kHz, and the square wave signals are input to a signal pin of a Y waveguide 6;
S5: the heating plate is turned on, the target temperature T is set to 82-88 ℃, and the laser generator 1 and the signal generator 5 are turned on for at least 96 hours.
The method is characterized in that two output polarization maintaining optical fibers of the Y waveguide 6 to be photoelectrically aged are subjected to shaft fusion, at the moment, light source light is input from a tail optical fiber of the Y waveguide 6, and is transmitted to the Y waveguide 6 after being returned to the Y waveguide 6 after being combined in a closed loop formed by the two output optical fibers of the Y waveguide 6.
The test conditions for the electrical aging in fig. 2 and 3 are: the heating temperature is 85 ℃, and a square wave electric signal with the frequency of 1kHz and the amplitude of +/-5V is applied; the test conditions for the photo-aging in fig. 4 and 5 are: the heating temperature of the heating plate is 85 ℃, and square wave electric signals with the frequency of 1kHz and the amplitude of +/-5V are applied; the input optical power is 180uw-220uw.
Claims (7)
1. A Y-waveguide optoelectric burn-in system, comprising:
Laser generator (1): for generating a laser light source;
Optical isolator (2): the input end is connected with the output end of the laser generator (1), the optical isolator (2) is used for realizing unidirectional isolation on a laser light source emitted by the laser generator (1), the output end of the optical isolator (2) is connected with a single-input optical fiber of the Y waveguide (6), and the free ends of two output optical fibers of the Y waveguide (6) are connected with a shaft;
Heating device (4): for providing a high temperature environment for the Y-waveguide (6);
Signal generator (5): is connected with a signal pin of the Y waveguide (6) and provides an electrical signal to the Y waveguide (6).
2. The Y waveguide optoelectric aging system according to claim 1, characterized in that the heating device (4) is an elongated heating plate, on which the Y waveguide (6) is placed for heating.
3. The Y-waveguide photoelectric aging system according to claim 1, wherein the output end of the optical isolator (2) is connected with a beam splitter (3), the beam splitter (3) is used for splitting a laser beam which is output by the optical isolator (2) and generated by the laser generator (1) into a plurality of beams, the heating device (4) is uniformly provided with a plurality of Y-waveguides (6) at intervals, and each output end of the beam splitter (3) is connected with an input optical fiber of one Y-waveguide (6).
4. A Y-waveguide optoelectric aging system according to claim 3, characterized in that the laser generator (1) and the optical isolator (2), the optical isolator (2) and the beam splitter (3), the beam splitter (3) and the input optical fiber of the Y-waveguide (6) and the free ends of the two output optical fibers of the Y-waveguide (6) are connected by means of optical fiber fusion respectively.
5. A method of optoelectric burn-in using the Y-waveguide optoelectric burn-in system of any one of claims 1-4, comprising the steps of:
s1: placing and fixing a Y waveguide (6) to be photoelectrically aged on a heating plate;
s2: the optical path is connected, the input end of the optical isolator (2) is connected with the output end of the laser generator (1) in an optical fiber fusion mode, then the output end of the optical isolator (2) is connected with the input end of the beam splitter (3) in an optical fiber fusion mode, each output end of the beam splitter (3) is connected with the input end of one Y waveguide (6) in an optical fiber fusion mode, and finally the free ends of two output optical fibers of the Y waveguides (6) are subjected to axial fusion;
s3: the circuit is connected with the output end of the signal generator (5) through a signal wire and is connected with a pair of signal pins of the Y waveguide (6);
S4: the photoelectric aging test is carried out, and the power of the laser generator (1) is adjusted to enable the output light power of the beam splitter (3) to be close to the actual value of the light power input into the Y waveguide (6) in the working state of the fiber-optic gyroscope; setting the signal generator (5), generating square wave or triangular wave signals with set amplitude and designated frequency, and inputting the square wave or triangular wave signals to a signal pin of the Y waveguide (6);
s5: the heating plate is started, the target heating temperature T is set, and the laser generator (1) and the signal generator (5) are started for h hours.
6. The photoelectric aging method according to claim 5, wherein the beam splitter (3) in the step S4 outputs a square wave signal having an optical power of 100uw to 1000uw, and the signal generator (5) has an electric wave signal frequency of 1kHz and an amplitude of ±5v.
7. The method according to claim 5, wherein in the step S5, T is not less than 82 ℃ and not more than 88 ℃, and in the step S5, h is not less than 96.
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