CN101221263A - Batch depolarizer production method with adjustable precision, stability and efficiency - Google Patents

Abstract

The invention discloses a batch manufacturing method of a depolarization device with adjustable precision, stability and efficiency. The depolarization device leads an optical polarization state to be distributed uniformly so as to realize the goal of depolarization. The performance of the invention is mainly decided by the lengths of two sections of polarization-preserving fibers and the included angle of 45 degrees of a double refraction main shaft. The manufacturing method is mainly based on an iterative thought of an automatic ring closing fusion jointing system, a strategy of changeable step length and a method for setting a threshold, thus solving the nonadjustable problems of the precision, stability and efficiency met during manufacturing the depolarization device in batch and being capable of fast and precisely manufacturing the depolarization device formed by same or various polarization-preserving fibers. The batch manufacturing method is especially suitable for manufacturing the depolarization device in batch.

Description

A kind of precision, stability and efficient batch depolarizer production method with adjustable

Technical field

The present invention relates to a kind of precision, stability and efficient batch depolarizer production method with adjustable.

Background technology

Depolarizer is the core optical component of fiber-optic depolarized gyro, the loss relevant with polarization when its principle is propagated in doubly refracting medium based on wideband light source.Its existence can suppress polarization nonreciprocity in the gyro and magneto-optic faraday nonreciprocity etc., has strengthened antijamming capability and the reliability of optical fibre gyro.The depolarizer that uses in the fiber-optic depolarized gyro is formed by the polarization maintaining optical fibre of two sections certain-lengths and 45 ° of weldings of birefringence main shaft angle thereof.But since at present when the batch making depolarizer precision, stability and efficient can not the property adjusted, so press for the deficiency that finds a kind of universal method to remedy the method for having now.

Summary of the invention

Deficiency when overcoming existing batch process depolarizer the object of the present invention is to provide the method for making of a kind of precision, stability and the adjustable batch depolarizer of efficient.

The technical solution used in the present invention is that it comprises the steps:

Condition I: degree of polarization P (θ)＞DOPFlag targets threshold;

Condition II: θ _k-θ _K+1＜0 number of revolutions k=1,2,3...;

1) motor is just changeed continuously with step-length θ ', till the value of degree of polarization P is greater than inversion threshold DOPOut, and then allow motor counter-rotating θ ', the θ angle of establishing this moment is initial value θ ₀=0, and write down corresponding P (θ ₀), allow motor counter-rotating θ again ", the θ angle of establishing this moment is θ ₁, and write down corresponding P (θ ₁), the I if the value of any pacing amount P does not satisfy condition then turns to step 6);

2) make number of revolutions k=1;

3) pass through iterative formula ${\mathrm{\θ}}_{k+1}={\mathrm{\θ}}_k+\frac{P\left({\mathrm{\θ}}_k\right)-\mathrm{DOPFlag}}{P\left({\mathrm{\θ}}_k\right)-P\left({\mathrm{\θ}}_{k-1}\right)/{\mathrm{\θ}}_{k-1}-{\mathrm{\θ}}_k},$ Calculate θ _K+1, if condition II sets up, turn to step 5), turn to step 7) if be false;

4) number of revolutions k++ turns to step 3);

5) record P (θ _k) and θ _kValue, and record P (θ _K+1) value, if condition I sets up, turn to step 4), turn to step 6) if be false;

6) program stops, and fuses two sections optical fiber;

7) record P (θ _K+1) value, get P (θ _K+1) and P (θ _k) the smaller, turn to step 6).

Targets threshold DOPFlag is set at 0.05%～0.50%, θ ' and θ " choose by the decision of the motor precision of optical fiber splicer, and θ ' 〉=θ ", the P (θ that occurs in the process _k) all be averaged in real time and obtain, sample frequency＞10Hz, the value of inversion threshold DOPOut is 2%～4%.

The present invention compared with prior art has following advantage:

Existing depolarizer production method exist efficiency and precision, stability can not the property adjusted.Under the prerequisite of guaranteed efficiency, often do not reach the required precision of system, stability; And under the requirement that guarantees precision, stability, often do not accomplish high efficiency.At above-mentioned defective, the present invention adopts the algorithm of iteration, the strategy of variable step size, the method of threshold setting, not only made full use of the high precision of stepper motor, improve the efficient of searching threshold position greatly, and accomplished the adjustable of efficiency and precision, stability when depolarizer is made, be particularly suitable for the batch making depolarizer.

Description of drawings

Fig. 1 is the software architecture block diagram that the present invention adopts.

Fig. 2 is the software flow block diagram that the present invention adopts.

Embodiment

Each functions of modules is as follows among Fig. 1:

Optical fiber splicer control

The motor initial alignment of control optical fiber splicer, optical fiber inspection, optical fiber are to axle, and processes such as fused fiber splice are controlled the motor movement of heat sealing machine, and accept the feedback information of heat sealing machine.

Degree of polarization tester control module

The startup of degree of polarization tester and stopped process, and the degree of polarization DOP data and the power data of reception degree of polarization tester.

Parameter is provided with

Comprise communications parameter, the setting of display parameter and optical fiber splicer parameter.

Closed-loop control

The core of software systems, just the inventive method.Motor according to DOP value automatic feedback control optical fiber splicer rotates, and finishes the making of depolarizer.

Data storage is written into

Can store and be written into degree of polarization DOP data, the motion record of power data and heat sealing machine motor.

Graphic presentation

Show degree of polarization DOP data and power data in real time.

1. with special-purpose Serial Port Line optical fiber splicer is linked to each other with the serial ports 1 of computer, the degree of polarization tester is connected with the serial ports 2 of computer.Put into two anchor clamps of optical fiber splicer after two sections polarization maintaining optical fibres are handled, the other end of first section optical fiber links to each other with superluminescent diode SLD light source tail optical fiber, the other end of second section optical fiber inserts in the degree of polarization tester, opens the driving power of superluminescent diode SLD light source.

2. the parameter of optical fiber splicer once is set, selects 45 ° of polarization maintaining optical fibre weldings, optical fiber splicer carries out 45 ° to axle, and 45 ° to entering time-out after the axle end.

3. begin method for making of the present invention, flow process is as follows:

Condition I: degree of polarization P (θ)＞DOPFlag targets threshold, targets threshold DOPFlag is set at 0.05%～0.50%;

Condition II: θ _k-θ _K+1＜0 number of revolutions k=1,2,3...;

1) motor is just changeed continuously with step-length θ ', till the value of degree of polarization P was greater than inversion threshold DOPOut, the value of inversion threshold DOPOut was 2%～4%, and then allowed motor counter-rotating θ ', and the θ angle of establishing this moment is initial value θ ₀=0, and write down corresponding P (θ ₀), allow motor counter-rotating θ again ", the θ angle of establishing this moment is θ ₁, and write down corresponding P (θ ₁), θ ' and θ " choose, and θ ' 〉=θ " by the decision of the motor precision of optical fiber splicer, generally getting θ ' is 0.2 degree, " be 0.1 degree, the I if the value of any pacing amount P does not satisfy condition then turns to step 6) to θ;

2) make number of revolutions k=1;

3) pass through iterative formula ${\mathrm{\θ}}_{k+1}={\mathrm{\θ}}_k+\frac{P\left({\mathrm{\θ}}_k\right)-\mathrm{DOPFlag}}{P\left({\mathrm{\θ}}_k\right)-P\left({\mathrm{\θ}}_{k-1}\right)/{\mathrm{\θ}}_{k-1}-{\mathrm{\θ}}_k},$ Calculate θ _K+1, if condition II sets up, turn to step 5), turn to step 7) if be false;

4) number of revolutions k++ turns to step 3);

5) record P (θ _k) and θ _kValue, and record P (θ _K+1) value, if condition I sets up, turn to step 4), turn to step 6) if be false;

6) program stops, and fuses two sections optical fiber;

7) record P (θ _K+1) value, get P (θ _K+1) and P (θ _k) the smaller, turn to step 6).P (θ in the process _k) all be averaged in real time and obtain, sample frequency＞10Hz,

Claims (5)

1. a precision, stability and efficient batch depolarizer production method with adjustable is characterized in that comprising the steps:

Condition I: degree of polarization P (θ)＞DOPFlag targets threshold;

Condition II: θ _k-θ _K+1＜0 number of revolutions k=1,2,3...;

1) motor is just changeed continuously with step-length θ ', till the value of degree of polarization P is greater than inversion threshold DOPOut, and then allow motor counter-rotating θ ', the θ angle of establishing this moment is initial value θ ₀=0, and write down corresponding P (θ ₀), allow motor counter-rotating θ again ", the θ angle of establishing this moment is θ ₁, and write down corresponding P (θ ₁), the I if the value of any pacing amount P does not satisfy condition then turns to step 6);

2) make number of revolutions k=1;

3) pass through iterative formula ${\mathrm{\θ}}_{k+1}={\mathrm{\θ}}_k+\frac{P\left({\mathrm{\θ}}_k\right)-\mathrm{DOPFlag}}{P\left({\mathrm{\θ}}_k\right)-P\left({\mathrm{\θ}}_{k-1}\right)/{\mathrm{\θ}}_{k-1}-{\mathrm{\θ}}_k},$ Calculate θ _K+1, if condition II sets up, turn to step 5), turn to step 7) if be false;

4) number of revolutions k++ turns to step 3);

5) record P (θ _k) and θ _kValue, and record P (θ _K+1) value, if condition I sets up, turn to step 4), turn to step 6) if be false;

6) program stops, and fuses two sections optical fiber;

7) record P (θ _K+1) value, get P (θ _K+1) and P (θ _k) the smaller, turn to step 6).

2. a kind of precision according to claim 1, stability and efficient batch depolarizer production method with adjustable, it is characterized in that: targets threshold DOPFlag is set at 0.05%～0.50%.

3. a kind of precision according to claim 1, stability and efficient batch depolarizer production method with adjustable is characterized in that: θ ' and θ " choose by the motor precision of optical fiber splicer and determine, and θ ' 〉=θ ".

4. a kind of precision according to claim 1, stability and efficient batch depolarizer production method with adjustable is characterized in that: the P (θ that occurs in the process _k) all be averaged in real time and obtain sample frequency＞10Hz.

5. a kind of precision according to claim 1, stability and efficient batch depolarizer production method with adjustable, it is characterized in that: the value of inversion threshold DOPOut is 2%～4%

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