CN104280212A - Method for realizing accurate adjustment of extinction ratio measurement value - Google Patents
Method for realizing accurate adjustment of extinction ratio measurement value Download PDFInfo
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- CN104280212A CN104280212A CN201410486495.3A CN201410486495A CN104280212A CN 104280212 A CN104280212 A CN 104280212A CN 201410486495 A CN201410486495 A CN 201410486495A CN 104280212 A CN104280212 A CN 104280212A
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- extinction ratio
- attenuator
- polarization beam
- polarized light
- ratio value
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Abstract
The invention provides a method for realizing accurate adjustment of an extinction ratio measurement value. Based on a parameter definition of an extinction ratio, different extinction ratio measurement values are achieved by changing powers of two beams of orthogonal polarized light. According to the working principle, input light is divided by a polarization beam splitter into two beams of orthogonal polarized light, the power of one path of light is attenuated, then the two paths of light are combined through a polarization beam combiner, and therefore adjustment of the extinction ratio measurement value can be achieved by controlling the attenuation amount of an attenuator. By means of the technical scheme, the method for realizing accurate adjustment of the extinction ratio measurement value realizes control over the two paths of orthogonal polarized light by utilizing the polarization beam splitting/combining principle, and achieves the purpose of adjustment of the extinction ratio measurement value by adjusting the power of the two paths of orthogonal polarized light.
Description
Technical field
The invention belongs to extinction ratio tester collimation technique field, in particular a kind ofly realize the accurately adjustable method of extinction ratio value.
Background technology
Extinction ratio tester is the instrument of test polarization maintaining optical fibre and polarizer extinction ratio parameter, in recent years along with polarization maintaining optical fibre and Related product thereof are in the widespread use of sensory field, the owning amount of domestic extinction ratio tester constantly increases, and the demand of it being carried out to measurement and calibration is also growing.The principle of work of extinction ratio tester adopts to rotate polarization analyzing method, the light that polarized light source sends arrives analyzer after polarization maintaining optical fibre, analyzer is with certain speed High Rotation Speed, the maxima and minima by analyzer rear polarizer luminous power is detected in real time by photodetector, then data processing is carried out according to extinction ratio computing formula, the measured value of display extinction ratio.
The calibration steps of current extinction ratio tester has two kinds, a kind of is utilize the polarization maintaining optical fibre demarcated to carry out transmission of quantity value, for a polarization maintaining optical fibre, its extinction ratio value is fixing, and will extinction ratio tester effectively be calibrated, just need the polarization maintaining optical fibre of many different extinction ratio values, this can be realized by the polarization axle artificially reversing polarization maintaining optical fibre, but the polarization state of transmission light in optical fiber can be caused unstable, and extinction ratio value easily produces great changes by ectocine.Another kind is that the polarization state by changing transmission light realizes different extinction ratio values, specifically use a polarizer and a quarter-wave plate, the linearly polarized light that the polarizer produces is through quarter-wave plate, angle difference between optical axis can produce the polarized light of different polarization states, corresponding extinction ratio value is also different, just can obtain different extinction ratio values by rotating quarter like this, thus realize the calibration to extinction ratio tester.This kind of method adopts spatial mode optical device, solves the problem of value instability, but very high to the accuracy requirement of angle rotation, and the resolution of conventional angle rotating disc is only 2 °, manually rotates the accuracy and repeatability that are difficult to ensure that angle rotates.
Therefore, prior art existing defects, needs to improve.
Summary of the invention
Technical matters to be solved by this invention is for the deficiencies in the prior art, provides a kind of and realizes the accurately adjustable method of extinction ratio value.
Technical scheme of the present invention is as follows: a kind ofly realize the accurately adjustable method of extinction ratio value, wherein, comprises the following steps:
Step 1: by the light that sends from wideband light source after polarization beam apparatus, be divided into the polarized light that two-way is orthogonal, wherein a road luminous power is P
1polarized light be input to an input end of polarization beam combiner, another road luminous power is P
2polarized light luminous power after attenuator become P
3, be input to another input end of polarization beam combiner, two-way luminous power is P
1and P
3polarized light through conjunction bundle after output to extinction ratio tester;
Step 2: according to the defined formula of extinction ratio, when luminous power unit is dBm, Extinction ratio=P
1-P
3=P
1-(P
2-P
iL-P
dB), wherein P
1and P
2be respectively the power of two-way polarized light after polarization beam apparatus, P
3for luminous power is P
2the power of polarized light after attenuator, P
iLfor the insertion loss of attenuator, P
dBfor the damping capacity of attenuator;
Step 3: the damping capacity of attenuator is set to 0dB, the output terminal of polarization beam combiner is connected with extinction ratio tester, the measured value ER of record extinction ratio
m, error of indication Δ ER=ER
m-ER
0;
Step 4: change extinction ratio value by the damping capacity of regulated attenuator, the error of indication Δ ER=ER of tested extinction ratio tester under obtaining different extinction ratio value
m-ER
i.
Described realizes the accurately adjustable method of extinction ratio value, wherein, described polarization beam apparatus and
The input and output of described polarization beam combiner are polarization maintaining optical fibre.
Described realizes the accurately adjustable method of extinction ratio value, and wherein, the operation wavelength of described wideband light source and the operation wavelength of described attenuator are 1310nm wave band or 1550nm wave band; The attenuation accuracy of described attenuator is ± 0.1dB.
Described realizes the accurately adjustable method of extinction ratio value, wherein, in described step 2, and described P
1, P
2and P
iLpower meter is used accurately to record; When the damping capacity of attenuator is 0dB, extinction ratio value ER
0it is a known definite value; The damping capacity P of regulated attenuator
dB, obtain different extinction ratio value ER
i=ER
0+ P
dB, thus realize the calibration to extinction ratio tester.
Adopt such scheme:
1, utilizing polarization beam splitting/conjunction Shu Yuanli, achieve the control to two-way crossed polarized light, reaching the adjustable object of extinction ratio value by regulating two-way polarized light power.
2, realize structure simply portable, wideband light source used and attenuator are the conventional instrument and equipment of optical communication field, are easy to the field calibration realizing extinction ratio tester.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
The present invention, from the parameter definition of extinction ratio, realizes different extinction ratio values by the power changing two bundle crossed polarized lights.Principle of work is: use a polarization beam apparatus that input light is divided into the orthogonal linearly polarized light of two-way, the luminous power on a wherein road is decayed, then two-way light carries out conjunction bundle by a polarization beam combiner again, and it is adjustable that the damping capacity like this by controlling attenuator just can realize extinction ratio value.
As shown in Figure 1, the light that wideband light source 101 sends, after polarization beam apparatus 102, is divided into the polarized light that two-way is orthogonal to concrete implementation procedure, and wherein a road luminous power is P
1polarized light is input to an input end of polarization beam combiner 104, and another road luminous power is P
2polarized light power after attenuator 103 become P
3be input to another input end of polarization beam combiner 104, two-way luminous power is P
1and P
3polarized light through conjunction bundle after output in extinction ratio tester 105.Wherein the input and output of polarization beam apparatus 102 and polarization beam combiner 104 are polarization maintaining optical fibre, the instrument and equipment that wideband light source 101 and attenuator 103 are commonly used for optical communication field, corresponding to the operation wavelength of extinction ratio tester 105, the operation wavelength of wideband light source 101 and the operation wavelength of attenuator 103 are 1310nm wave band or 1550nm wave band, and attenuation accuracy requires to be ± 0.1dB.According to the defined formula of extinction ratio, when luminous power represents in logarithmic fashion, when namely unit is dBm, Extinction ratio=P
1-P
3=P
1-(P
2-P
iL-P
dB), wherein P
1and P
2be respectively the power of two-way polarized light after polarization beam apparatus, P
3for luminous power is P
2the power of polarized light after attenuator, P
iLfor the insertion loss of attenuator, P
dBfor the damping capacity of attenuator.Three parameter P in above-mentioned formula
1, P
2and P
iLpower meter can be used accurately to record, and therefore for specific wideband light source and attenuator, when the damping capacity of attenuator is 0dB, extinction ratio is now a known definite value ER
0.The damping capacity P of regulated attenuator
dB, just can obtain different extinction ratio value ER
i=ER
0+ P
dB, thus realize the calibration to extinction ratio tester.Calibration process is as follows:
1. the damping capacity of attenuator is set to 0dB, the output terminal of polarization beam combiner is connected with extinction ratio tester, the measured value ER of record extinction ratio
m, error of indication Δ ER=ER
m-ER
0.
2. change extinction ratio value by the damping capacity of regulated attenuator, the error of indication Δ ER=ER of tested extinction ratio tester under different extinction ratio value can be obtained
m-ER
i.
Adopt such scheme:
1, utilizing polarization beam splitting/conjunction Shu Yuanli, achieve the control to two-way crossed polarized light, reaching the adjustable object of extinction ratio value by regulating two-way polarized light power.
2, realize structure simply portable, wideband light source used and attenuator are the conventional instrument and equipment of optical communication field, are easy to the field calibration realizing extinction ratio tester.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (4)
1. realize the method that extinction ratio value is accurately adjustable, it is characterized in that, comprise the following steps:
Step 1: by the light that sends from wideband light source after polarization beam apparatus, be divided into the polarized light that two-way is orthogonal, wherein a road luminous power is P
1polarized light be input to an input end of polarization beam combiner, another road luminous power is P
2polarized light luminous power after attenuator become P
3, be input to another input end of polarization beam combiner, two-way luminous power is P
1and P
3polarized light through conjunction bundle after output to extinction ratio tester;
Step 2: according to the defined formula of extinction ratio, when luminous power unit is dBm, Extinction ratio=P
1-P
3=P
1-(P
2-P
iL-P
dB), wherein P
1and P
2be respectively the power of two-way polarized light after polarization beam apparatus, P
3for luminous power is P
2the power of polarized light after attenuator, P
iLfor the insertion loss of attenuator, P
dBfor the damping capacity of attenuator;
Step 3: the damping capacity of attenuator is set to 0dB, the output terminal of polarization beam combiner is connected with extinction ratio tester, the measured value ER of record extinction ratio
m, error of indication Δ ER=ER
m-ER
0;
Step 4: change extinction ratio value by the damping capacity of regulated attenuator, the error of indication Δ ER=ER of tested extinction ratio tester under obtaining different extinction ratio value
m-ER
i.
2. realize the accurately adjustable method of extinction ratio value as claimed in claim 1, it is characterized in that, the input and output of described polarization beam apparatus and described polarization beam combiner are polarization maintaining optical fibre.
3. realize the accurately adjustable method of extinction ratio value as claimed in claim 1, it is characterized in that, the operation wavelength of described wideband light source and the operation wavelength of described attenuator are 1310nm wave band or 1550nm wave band; The attenuation accuracy of described attenuator is ± 0.1dB.
4. realize the accurately adjustable method of extinction ratio value as claimed in claim 1, it is characterized in that, in described step 2, described P
1, P
2and P
iLpower meter is used accurately to record; When the damping capacity of attenuator is 0dB, extinction ratio value ER
0it is a known definite value; The damping capacity P of regulated attenuator
dB, obtain different extinction ratio value ER
i=ER
0+ P
dB, thus realize the calibration to extinction ratio tester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410486495.3A CN104280212B (en) | 2014-09-22 | One realizes the accurate adjustable method of extinction ratio value |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410486495.3A CN104280212B (en) | 2014-09-22 | One realizes the accurate adjustable method of extinction ratio value |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104280212A true CN104280212A (en) | 2015-01-14 |
| CN104280212B CN104280212B (en) | 2017-01-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107800492A (en) * | 2017-12-13 | 2018-03-13 | 武汉电信器件有限公司 | A kind of device and method of automatic test silicon light coherent receiver polarization extinction ratio |
| CN114112329A (en) * | 2021-12-28 | 2022-03-01 | 长飞光纤光缆股份有限公司 | Polarization extinction ratio measuring system and method for lossless optical fiber |
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| JPH06317498A (en) * | 1993-05-07 | 1994-11-15 | Nec Corp | Extinction ratio measuring method in assembling process of polarization maintaining fiber and semiconductor laser |
| CN102183360A (en) * | 2011-03-04 | 2011-09-14 | 天津大学 | Method and device for detecting polarization extinction ratio of optical polarizer |
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| CN103293606A (en) * | 2013-05-13 | 2013-09-11 | 光库通讯(珠海)有限公司 | Fiber adapter and measurement method for extinction ratio of optical fiber connector |
| CN103592728A (en) * | 2013-11-28 | 2014-02-19 | 北京浦丹光电技术有限公司 | Double-PIN optical detector component integrating polarization beam splitting function |
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| JPH06317498A (en) * | 1993-05-07 | 1994-11-15 | Nec Corp | Extinction ratio measuring method in assembling process of polarization maintaining fiber and semiconductor laser |
| CN102183360A (en) * | 2011-03-04 | 2011-09-14 | 天津大学 | Method and device for detecting polarization extinction ratio of optical polarizer |
| CN102279052A (en) * | 2011-06-21 | 2011-12-14 | 中国科学院上海技术物理研究所 | Method for measuring characteristics of polarized light in real time |
| CN103017908A (en) * | 2012-11-30 | 2013-04-03 | 中国科学院上海技术物理研究所 | Polarized light characteristic real-time measuring device and method based on four-way light splitting module |
| CN103245490A (en) * | 2013-05-10 | 2013-08-14 | 武汉钜风科技有限公司 | Measuring method for polarization mode coupling distribution in polarization maintaining optical fibre |
| CN103293606A (en) * | 2013-05-13 | 2013-09-11 | 光库通讯(珠海)有限公司 | Fiber adapter and measurement method for extinction ratio of optical fiber connector |
| CN103592728A (en) * | 2013-11-28 | 2014-02-19 | 北京浦丹光电技术有限公司 | Double-PIN optical detector component integrating polarization beam splitting function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107800492A (en) * | 2017-12-13 | 2018-03-13 | 武汉电信器件有限公司 | A kind of device and method of automatic test silicon light coherent receiver polarization extinction ratio |
| CN114112329A (en) * | 2021-12-28 | 2022-03-01 | 长飞光纤光缆股份有限公司 | Polarization extinction ratio measuring system and method for lossless optical fiber |
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