CN1042606A - The method and apparatus of measuring optical fiber and optical system polarization extinction ratio - Google Patents
The method and apparatus of measuring optical fiber and optical system polarization extinction ratio Download PDFInfo
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- CN1042606A CN1042606A CN 88107782 CN88107782A CN1042606A CN 1042606 A CN1042606 A CN 1042606A CN 88107782 CN88107782 CN 88107782 CN 88107782 A CN88107782 A CN 88107782A CN 1042606 A CN1042606 A CN 1042606A
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- extinction ratio
- polarizing prism
- polarization extinction
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- polarized lights
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Abstract
The method and apparatus of a kind of measuring optical fiber and optical system polarization extinction ratio adopts polarizing prism output that two kinds of rectilinearly polarized lights of certain splitting angle are arranged; Monitor the light intensity of these two kinds of rectilinearly polarized lights simultaneously by two photodetectors, feed-in divider then, the rotatory polarization prism is measured the signal extreme value by divider output, obtains tested polarization extinction ratio by calculating.The relevant detection device is made up of institutes such as light source, beam coupler, polarizing prism, photodetector and dividers.Polarizing prism be analyzer be again beam splitter, detect so as to carrying out double light path.
Description
The invention belongs to the method and apparatus of optical parametric test
The method of existing tests polarization extinction ratio is the partial poolarized light process device for checking and editting that system under test (SUT) is exported, and by photodetector monitoring output light intensity, rotates analyzer and makes priority maximum value I occur then
MaxWith minimal value I
Min, utilize formula K=(Imin)/(Imax) to obtain the unidirectional detection method of system under test (SUT) polarization extinction ratio K.For eliminating the influence that the intensity of light source rises and falls, the bundle device of often plusing fifteen before system under test (SUT) is told a branch of reference light and is formed the double light path detection.The shortcoming of this kind method is the measuring accuracy that the polarization extinction ratio of analyzer itself directly has influence on system.When system under test (SUT) is optical fiber or fibre system, can't insert beam splitter because coupled room is very little, at this moment can only carry out the monochromatic light road and detect, thereby can't eliminate the influence that the intensity of light source rises and falls.
The pick-up unit of prior art is made up of light source, coupled system, device for checking and editting and four parts such as photodetector basically, and system under test (SUT) is placed on before the analyzer.When double light path detected, plused fifteen before system under test (SUT) bundle plate or beam splitter prism were told a reference path, and monitor its light intensity with photodetector, and light intensity is carried out normalization to detection signal thus.
The present invention be directed to above-mentioned shortcoming and make improvements, design and reduced the influence of analyzer polarization extinction ratio and do not have the intensity of light source the rise and fall new method and the new equipment of influence again.
Technical scheme of the present invention is to adopt twocouese double light path detection method.Make the partial poolarized light of system under test (SUT) (M) output resolve into two kinds of rectilinearly polarized lights with certain splitting angle through polarizing prism (3).Rotatory polarization prism (3) is monitored simultaneously the light intensity of these two kinds of rectilinearly polarized lights respectively by two photodetectors (4A and 4B), calculated the polarization extinction ratio (K) of system under test (SUT) by the extreme value (D) of the ratio of these two light intensities.Computing formula is K=ρ D.ρ is an instrument constant in the formula.If use hand computation, ρ=1 then, if use Other Instruments, for example divider etc. calculates, and then measures during to instrument calibration with the system of K=1.
Device of the present invention is made up of light source (1), coupled system (2), polarizing prism (3), photodetector (4A and 4B) and divider five parts such as (5) basically.Polarizing prism (3) is loaded in the same rotor with two photodetectors (4A and 4B), and their relative position remains unchanged during rotation.Export the extreme value (D) of the electric signal that is directly proportional with tested polarization extinction ratio at last by divider.
Advantage of the present invention is the extreme value that detects the ratio of two kinds of polarized light light intensity on both direction simultaneously, and is again that double light path detects; Detected in this way signal had not only reduced the influence of analyzer polarization extinction ratio but also had not had the influence that the intensity of light source rises and falls, thus the accuracy of detection height, and can be realized all that by check system double light path detects to any.Device is simple compact, easy to operate, detection speed is fast.
Below in conjunction with the description of drawings embodiments of the invention.Among the figure: the 1st, light source preferably adopts semiconductor laser; The 2nd, coupled system, it makes the light of light source be coupled into system under test (SUT) (M) to greatest extent; The 3rd, polarizing prism, it makes the partial poolarized light of system under test (SUT) output resolve into two kinds of rectilinearly polarized lights that are mutually certain angle θ.What adopt in the example is OE dual output prism, and output is mutually two kinds of rectilinearly polarized lights about 98 degree; 4A and 4B are two photodetectors, are contained in the same rotor with polarizing prism (3) and (do not mark rotor among the figure), and the intensity in order to two kinds of rectilinearly polarized lights of monitoring polarizing prism output has adopted photomultiplier among the embodiment; The 5th, divider, it receives the electric signal of 2 photodetector feed-ins, and carries out division calculation and output result calculated, finds out extreme value (D) from many results.
Claims (3)
1, the method for a kind of measuring optical fiber and optical system polarization extinction ratio.It is characterized in that making the partial poolarized light of system under test (SUT) [M] output to resolve into two kinds of rectilinearly polarized lights with certain splitting angle [θ] through polarizing prism [3].Rotate this polarizing prism, monitor the light intensity of these two kinds of rectilinearly polarized lights simultaneously by two photodetectors [4A and 4B] respectively.Extreme value [D] by the ratio of these two light intensities calculates tested polarization extinction ratio.
2, the device of a kind of measuring optical fiber and optical system polarization extinction ratio.Mainly by light source (1), coupled system (2), polarizing prism (3), photodetector (4A and 4B) and divider (5) are formed.It is characterized in that polarizing prism (3) output has two kinds of rectilinearly polarized lights of certain splitting angle (θ), it promptly is that analyzer is again a beam splitter.
3, by the described device of claim 2, it is characterized in that two photodetectors (4A and 4B) and polarizing prism (3) are installed in the same rotor, their relative position remains unchanged during rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88107782 CN1016280B (en) | 1988-11-10 | 1988-11-10 | Measuring method and equipment of polarization-dulling ratio optical fibre and optical |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88107782 CN1016280B (en) | 1988-11-10 | 1988-11-10 | Measuring method and equipment of polarization-dulling ratio optical fibre and optical |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1042606A true CN1042606A (en) | 1990-05-30 |
| CN1016280B CN1016280B (en) | 1992-04-15 |
Family
ID=4834777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88107782 Expired CN1016280B (en) | 1988-11-10 | 1988-11-10 | Measuring method and equipment of polarization-dulling ratio optical fibre and optical |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1016280B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100378445C (en) * | 2004-12-28 | 2008-04-02 | 中国科学院上海光学精密机械研究所 | Intelligent comprehensive measuring instrument for half-wave voltage and wave plate phase delay of extinction ratio of crystal |
| CN102183360A (en) * | 2011-03-04 | 2011-09-14 | 天津大学 | Method and device for detecting polarization extinction ratio of optical polarizer |
| CN102269647A (en) * | 2011-05-10 | 2011-12-07 | 浙江大学 | Device and method for testing polarization extinction ratio of polarization-maintaining fiber coupler based on resonator technology |
| CN102759398A (en) * | 2012-06-28 | 2012-10-31 | 北京国科世纪激光技术有限公司 | Device for measuring analyzed laser energy output by polarization maintaining optical fiber |
| CN102928204A (en) * | 2012-11-07 | 2013-02-13 | 中国计量科学研究院 | Optical fiber polarization extinction ratio standard device |
| CN104897368A (en) * | 2015-05-05 | 2015-09-09 | 上海大学 | Real-time polarization maintaining fiber extinction ratio testing device |
| CN105784581A (en) * | 2016-05-06 | 2016-07-20 | 武汉理工大学 | Metal corrosion monitoring system and method based on optical waveguide mode alternative transmission |
-
1988
- 1988-11-10 CN CN 88107782 patent/CN1016280B/en not_active Expired
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100378445C (en) * | 2004-12-28 | 2008-04-02 | 中国科学院上海光学精密机械研究所 | Intelligent comprehensive measuring instrument for half-wave voltage and wave plate phase delay of extinction ratio of crystal |
| CN102183360A (en) * | 2011-03-04 | 2011-09-14 | 天津大学 | Method and device for detecting polarization extinction ratio of optical polarizer |
| CN102183360B (en) * | 2011-03-04 | 2015-09-30 | 天津大学 | The detection method of polarization extinction ratio of optical polarizer and pick-up unit |
| CN102269647A (en) * | 2011-05-10 | 2011-12-07 | 浙江大学 | Device and method for testing polarization extinction ratio of polarization-maintaining fiber coupler based on resonator technology |
| CN102759398A (en) * | 2012-06-28 | 2012-10-31 | 北京国科世纪激光技术有限公司 | Device for measuring analyzed laser energy output by polarization maintaining optical fiber |
| CN102928204A (en) * | 2012-11-07 | 2013-02-13 | 中国计量科学研究院 | Optical fiber polarization extinction ratio standard device |
| CN102928204B (en) * | 2012-11-07 | 2015-04-08 | 中国计量科学研究院 | Optical fiber polarization extinction ratio standard device |
| CN104897368A (en) * | 2015-05-05 | 2015-09-09 | 上海大学 | Real-time polarization maintaining fiber extinction ratio testing device |
| CN104897368B (en) * | 2015-05-05 | 2018-08-07 | 上海大学 | Polarization maintaining optical fibre extinction ratio real-time test device |
| CN105784581A (en) * | 2016-05-06 | 2016-07-20 | 武汉理工大学 | Metal corrosion monitoring system and method based on optical waveguide mode alternative transmission |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1016280B (en) | 1992-04-15 |
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