CN112050943B - Polarization degree testing method for polarized light of light scrambler - Google Patents
Polarization degree testing method for polarized light of light scrambler Download PDFInfo
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- CN112050943B CN112050943B CN202010770012.8A CN202010770012A CN112050943B CN 112050943 B CN112050943 B CN 112050943B CN 202010770012 A CN202010770012 A CN 202010770012A CN 112050943 B CN112050943 B CN 112050943B
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- 230000010287 polarization Effects 0.000 title claims abstract description 106
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J4/00—Measuring polarisation of light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J4/00—Measuring polarisation of light
- G01J4/04—Polarimeters using electric detection means
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Abstract
The invention discloses a polarization device for polarized light after polarizationA degree test method belongs to the technical field of optical measurement. In the prior art, a polarization state analyzer is used, and the polarization degree of the polarized light after the polarization disturbance of the light polarization disturbance device is approximately obtained through a polarization degree formula, so that the method has the defects of expensive instruments and complex systems. The method of the invention comprises the following steps: a single-mode fiber jumper is used for sequentially connecting a polarization-maintaining light source, a polarization controller, a light scrambler to be tested, a polarization analyzer and an optical power meter; the polarization maintaining light source generates completely polarized light with stable polarization state; the polarization controller is adjusted by the upper computer, so that the polarization state of the light output by the polarization controller is S 1 The method comprises the steps of carrying out a first treatment on the surface of the Adjusting the average time of the optical power meter test process to be t 1 The method comprises the steps of carrying out a first treatment on the surface of the The angle of the analyzer is adjusted from 0 degree to 360 degrees by using an upper computer, the step is adjusted to 2 degrees, the light intensity value is recorded in real time in the adjustment process, and the maximum light intensity P is obtained max And minimum light intensity P min The method comprises the steps of carrying out a first treatment on the surface of the The average time is t 1 Input polarized light is S 1 When the polarization degree of the polarized light is disturbed by the light scrambler to be measured.
Description
Technical Field
The invention relates to a polarization degree testing method for polarized light of a light scrambler, and belongs to the technical field of optical measurement.
Background
The optical scrambler can change the polarization state of input light fast to generate random polarization state, eliminate the influence of the disturbance of the polarization state of the input light to the test in a period of time, and is widely applied to the fields of long-distance optical communication, high-speed optical communication, optical fiber sensing and the like. For example, in a long-distance optical fiber communication system, the optical scrambler can be applied to reducing the polarization hole burning phenomenon of the optical fiber amplifier, improving the signal to noise ratio of signal transmission, and the lower the polarization degree of the polarized light after being scrambled by the optical scrambler is, the better the inhibition effect of the polarization hole burning phenomenon of the optical fiber amplifier is; in the process of testing the polarization characteristics of the high-speed optical communication passive device, the lower the polarization degree of the polarized light is, the more uniform the polarization state of the incident light is covered on the bonding ball, and the better the test effect is; in the field of optical fiber sensing, the light scrambler is applied to reduce polarization-related noise, and the lower the polarization degree of polarized light after being scrambled by the light scrambler is, the better the polarization-related noise suppression effect is.
The polarization degree of light represents the proportion of the total light energy of the completely polarized light in a beam of light, and can be expressed as follows:
wherein P is polarized Intensity of completely polarized light (mW), P in light to be measured unpolarized Intensity of unpolarized light (mW), P in light to be measured total Full light intensity (mW), DOP-polarization degree of light.
The polarization degree of the completely polarized light is constant at 1, but there are three polarization states: linearly polarized light, circularly polarized light, elliptically polarized light. The light scrambler can change the polarization state of completely polarized light to make the average polarization characteristic of the completely polarized light approximate to that of unpolarized light with 0 polarization degree (but the polarization degree of the specific moment is still 1) in a period of time, so as to reduce or eliminate the influence of the input light polarization state disturbance on the test in a period of time.
The polarization degree of the polarized light after the light scrambler is a core index of the light scrambler, the polarization scrambling effect of the light scrambler is represented, various polarization degree testing methods such as a polarization scrambling method and an extremum searching method exist, but the completely polarized light still is the completely polarized light after passing through the light scrambler, so that the DOP is tested to be 1 no matter how the polarization scrambling effect is, and the polarization degree of the polarized light after the light scrambler is disturbed can not be tested by the conventional method. The polarization degree test of the polarized light of the optical scrambler produced by enterprises generally uses a polarization state analyzer, stokes parameters of the light to be tested in a plurality of time points are tested in a period of time, then the obtained Stokes parameters are averaged, and the polarization degree of the polarized light of the optical scrambler is approximately obtained through a polarization degree formula, but the polarization state analyzer is complex in system and high in price, so that the method is high in use cost and unfavorable for popularization.
Disclosure of Invention
The invention aims to provide a polarization degree testing method for the polarized light of the optical scrambler, which is used for reasonably evaluating the polarization performance of the optical scrambler, reducing the polarization degree testing cost of the polarized light of the optical scrambler and lowering the operation difficulty.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a polarization degree testing method for polarized light of a light scrambler comprises the following steps:
s1, sequentially connecting a polarization maintaining light source, a polarization controller, a light scrambler to be tested, a polarization analyzer and an optical power meter by using a single-mode fiber jumper;
s2, generating completely polarized light with stable polarization state by the polarization maintaining light source;
s3, adjusting the polarization controller by using the upper computer to enable the polarization state of the light output by the polarization controller to be S 1 ；
S4, adjusting the average time of the testing process of the optical power meter to be t 1 ；
S5, adjusting the angle of the analyzer from 0 degree to 360 degrees through an upper computer, adjusting the step to 2 degrees, recording the light intensity value in real time in the adjustment process, and obtaining the maximum light intensity P max And minimum light intensity P min ；
S6, obtaining the average time t 1 The polarization state of the input light is S 1 When the polarization degree of the polarized light is disturbed by the light scrambler to be measured.
In the step S1, five parts of the polarization maintaining light source, the polarization controller, the light scrambler to be tested, the polarization analyzer and the optical power meter are controlled by an upper computer.
The formula for calculating the degree of polarization in step S6 is:
wherein: />
-polarization degree of polarized light, P, after being scrambled by the light scrambler max Maximum light intensity (mW), P min -minimum light intensity (mW).
The polarization degree testing method for the polarized light of the light scrambler provided by the invention uses the intensity fluctuation of the polarized light passing through the analyzer to represent the polarization degree index of the polarized light of the light scrambler, does not need to use an expensive and complex polarization state analyzer, and has the advantages of simple measuring system and method, low cost, wide application range and the like, and the instruments forming the system are common instruments.
Drawings
FIG. 1 is a flow chart of a method for testing the polarization degree of polarized light after the polarization of the light scrambler.
The reference numerals include: 100-polarization-maintaining light source, 101-polarization controller, 102-light scrambler to be tested, 103-analyzer, 104-optical power meter and 105-upper computer.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and detailed description:
a polarization degree testing method of polarized light of a light scrambler after scrambling is shown in fig. 1, which comprises the following steps:
s1, a single-mode fiber jumper is used for sequentially connecting a polarization maintaining light source 100, a polarization controller 101, a light scrambler 102 to be detected, a polarization analyzer 103 and a light power meter 104, all the five parts are controlled by an upper computer 105, the polarization controller 101 adopts a manual three-ring polarization controller, the light scrambler 102 to be detected is a PCD-005 type light scrambler module of LUNA company, and the polarization analyzer 103 is a manual adjustable polarization analyzer.
S2, the polarization maintaining light source 100 generates completely polarized light with stable polarization state.
S3, adjusting the polarization controller 101 by using the upper computer 105 to enable the polarization state of the light output by the polarization controller 101 to be S 1 (1，1，0，0)。
S4, flattening the test process of the optical power meter 104The average time is adjusted to t 1 ＝10ms。
S5, adjusting the angle of the analyzer 103 from 0 degree to 360 degrees through the upper computer 105, adjusting the step to 2 degrees, recording the light intensity value in real time in the adjustment process, and obtaining the maximum light intensity P max =10.2 mW and minimum light intensity P min ＝9.3mW；
S6, obtaining the average time t 1 The polarization state of the input light is S 1 When the light scrambler 102 to be tested scrambles the polarization degree of polarized light, the polarization degree calculation formula is as follows:
wherein: />
-polarization degree of polarized light, P, after being scrambled by the light scrambler max Maximum light intensity (mW), P min -minimum light intensity (mW).
Calculated according to the formula:
the average time is 10ms, and the polarization degree of the polarized light after the light scrambler 102 to be tested is scrambled is 4.6% when the input light polarization state is (1, 0), so that the light scrambler has better scrambling effect.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (1)
1. The polarization degree testing method for the polarized light of the light scrambler is characterized by comprising the following steps:
s1, sequentially connecting a polarization maintaining light source, a polarization controller, a light scrambler to be tested, a polarization analyzer and an optical power meter by using a single-mode fiber jumper;
s2, generating completely polarized light with stable polarization state by the polarization maintaining light source;
s3, adjusting the polarization controller by using the upper computer to enable the polarization state of the output light of the polarization controller to be S 1 ；
S4, adjusting the average time of the optical power meter in the test process to be t 1 ；
S5, adjusting the angle of the analyzer from 0 degree to 360 degrees through an upper computer, adjusting the step to 2 degrees, recording the light intensity value in real time in the adjustment process, and obtaining the maximum light intensity P max And minimum light intensity P min ；
S6, calculating the average time to be t 1 The polarization state of the input light is S 1 When the polarization degree of the polarized light is measured, the polarization degree of the polarized light is measured by the light scrambler;
in the step S1, five parts of a polarization maintaining light source, a polarization controller, a light scrambler to be tested, a polarization analyzer and an optical power meter are controlled by an upper computer;
the formula for calculating the degree of polarization in step S6 is: DOP= (P max -P min )/(P max +P min ) Wherein: DOP-polarization degree of polarized light after polarization disturbance of light scrambler, P max Maximum light intensity (mW), P min -minimum light intensity (mW).
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| JPH10215220A (en) * | 1997-01-30 | 1998-08-11 | Sumitomo Osaka Cement Co Ltd | Radio wave reception method and radio wave reception system |
| JP2000088707A (en) * | 1998-09-16 | 2000-03-31 | Sumitomo Osaka Cement Co Ltd | Method for measuring degree of polarization of polarization scrambler |
| CN1811359A (en) * | 2004-12-01 | 2006-08-02 | 通用光讯光电技术（北京）有限公司 | Measurements of polarization-dependent loss (pdl) and degree of polarization (dop) using optical polarization controllers and method thereof |
| CN102645281A (en) * | 2012-04-26 | 2012-08-22 | 暨南大学 | Method for measuring degree of polarization by means of polarization beam splitter prism |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6549283B2 (en) * | 2001-06-27 | 2003-04-15 | Agilent Technologies, Inc. | Method and system for determining the degree of polarization of light |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10215220A (en) * | 1997-01-30 | 1998-08-11 | Sumitomo Osaka Cement Co Ltd | Radio wave reception method and radio wave reception system |
| JP2000088707A (en) * | 1998-09-16 | 2000-03-31 | Sumitomo Osaka Cement Co Ltd | Method for measuring degree of polarization of polarization scrambler |
| CN1811359A (en) * | 2004-12-01 | 2006-08-02 | 通用光讯光电技术（北京）有限公司 | Measurements of polarization-dependent loss (pdl) and degree of polarization (dop) using optical polarization controllers and method thereof |
| CN102645281A (en) * | 2012-04-26 | 2012-08-22 | 暨南大学 | Method for measuring degree of polarization by means of polarization beam splitter prism |
Non-Patent Citations (1)
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| 偏振度测试方法的研究;阴亚芳等;《光通信研究》;20050915;第68-70页 * |
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