CN104897368A - Real-time polarization maintaining fiber extinction ratio testing device - Google Patents
Real-time polarization maintaining fiber extinction ratio testing device Download PDFInfo
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- CN104897368A CN104897368A CN201510224794.4A CN201510224794A CN104897368A CN 104897368 A CN104897368 A CN 104897368A CN 201510224794 A CN201510224794 A CN 201510224794A CN 104897368 A CN104897368 A CN 104897368A
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- polarized light
- beam splitter
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Abstract
The invention discloses a real-time polarization maintaining fiber extinction ratio testing device, comprising a polarization maintaining fiber, a fiber collimator, a circularly polarized light beam splitter, a first photoelectric detector, a second photoelectric detector and a signal processing unit, wherein after optical signals output by the polarization maintaining fiber pass through the fiber collimator and the circularly polarized light beam splitter, two beams of orthogonal circularly polarized light are obtained; and division and other operations are performed on the power of the light via the photoelectric detectors and the signal processing unit to obtain the extinction ratio of the tested polarized light. The light path of the system is completely formed by static optical elements, so the requirement for the precision of the light path is low, and meanwhile, real-time measurement of the extinction ratio of the polarized light can be realized.
Description
Technical field
The present invention relates to a kind of polarization maintaining optical fibre extinction ratio real-time test device, belong to field of optical measuring technologies.
Background technology
Polarization-maintaining fiber (PMF) has high birefringent characteristic, and thus can make the polarized light consistent with its Orientation of polarized main axis after transmitting very long distance, still keep its polarization state, in coherent light communication, optical fibre gyro and sensory field of optic fibre are used widely.
Extinction ratio is the important indicator of PMF performance parameter, the research comparative maturity of extinction ratio proving installation both domestic and external.Commercial extinction ratio proving installation all adopts rotatable polarizer method, namely by measuring the situation of change of received light power in the process that rotates a circle at polarizer, obtain the output extinction ratio of polarization maintaining optical fibre and the angle of polarization ellipse major axis, such as Canadian OZ company, the product of the Santec company of the U.S. all adopts this technology.Rotatable polarizer method needs the rotatable polarizer of machinery, and the core diameter of optical fiber is very little, therefore very high to the accuracy requirement of light path, and the high frequency response of proving installation is poor simultaneously, can not meet the requirement of high speed optical fiber communication.
Summary of the invention
For the deficiency that prior art exists, the object of the invention is to propose a kind of polarization maintaining optical fibre extinction ratio real-time test device, it is made up of static optical component, the extinction ratio proving installation of the tested polarization state of energy high-speed response, specifically, be a kind of non-source test device based on circularly polarized light.By the analysis to pairwise orthogonal circularly polarized light power ratio in tested polarized light, obtain by the extinction ratio of light-metering.Owing to there is not relative rotary device in the light path of proving installation, therefore the accuracy requirement of program light path is low, and can realize the real-time measurement of extinction ratio.
For achieving the above object, design of the present invention is:
The present invention is primarily of unit compositions such as optical fiber collimator, circularly polarized light beam splitter, photodetector and operational analysis circuit.After the light signal that polarization maintaining optical fibre exports enters into circularly polarized light beam splitter by optical fiber collimator, the pairwise orthogonal circular polarization state in incident polarized light is realized power and is separated by circularly polarized light beam splitter, the power of separation
,
respectively by two photoelectric detector.Because extinction ratio is defined as the major axis of elliptically polarized light and the ratio of minor axis power, namely
, wherein
with
be respectively major axis and the minor axis of elliptically polarized light,
for the angle of latitude of elliptically polarized light in poincare sphere, therefore identical rotation direction (referring to left-handed/dextrorotation), identical extinction ratio, the polarized light of different long axis direction is positioned on the Same Latitude circle of poincare sphere.In input polarization light, Left-hand circular polarization luminous power is
, right-hand circular polarization luminous power is
.Ratio between two with
pass be
.After the division arithmetic of operational analysis circuit and other process, the extinction ratio PER of PMF input optical signal can be obtained.
According to foregoing invention design, the present invention adopts following technical proposals:
A kind of polarization maintaining optical fibre extinction ratio real-time test device, comprises polarization maintaining optical fibre, optical fiber collimator, circularly polarized light beam splitter, the first photodetector, the second photodetector and signal processing unit; The polarized light that described polarization maintaining optical fibre exports is by after optical fiber collimator, enter circularly polarized light beam splitter, two mutually orthogonal circularly polarized light implementation spaces in polarized light are separated by described circularly polarized light beam splitter, one tunnel exports light and enters described first photodetector by optical fiber collimator, and another road exports light and enters described second photodetector by optical fiber collimator; The output of two photodetectors is all connected to described signal processing unit.
Described circularly polarized light beam splitter is bulk optical type circular polarization beam splitter.Described bulk optical type circular polarization beam splitter is made up of a wideband quarter wave plate and a line polarizing beam splitter; Described wideband quarter wave plate is parallel or vertical with the optical axis of described line polarizing beam splitter.
Or described bulk optical type circular polarization beam splitter is made up of a non-polarizing beamsplitter and two circuit polarizers; The splitting ratio of described non-polarizing beamsplitter is 50:50; The rotation direction of described two circuit polarizers is orthogonal.
Or described optical fiber collimator fiber adapter replaces, described circularly polarized light beam splitter is optical-fiber type circularly polarized light beam splitter; After the polarized light that described polarization maintaining optical fibre exports enters described optical-fiber type circularly polarized light beam splitter by described fiber adapter, be divided into the circularly polarized light that two bundle polarization directions are orthogonal, one tunnel exports light and enters described first photodetector, and another road exports light and enters described second photodetector; The output of two photodetectors is all connected to described signal processing unit.
Described optical-fiber type circular polarization beam splitter is made up of a band optical fiber quarter-wave plate and an optical fiber molded line polarizing beam splitter; The input end polarization maintaining optical fibre not turning end polarization maintaining optical fibre and described optical fiber molded line polarizing beam splitter of described band optical fiber quarter-wave plate welds axle.
Or described optical-fiber type circular polarization beam splitter is made up of 3dB single-mode optical-fibre coupler and two optical-fiber type circuit polarizers; The input end fiber of the described optical-fiber type circuit polarizer of two output terminal respectively with two of described 3dB single-mode optical-fibre coupler is not welded axle; (circularly polarized light of output is mutually orthogonal for two described optical-fiber type circuit polarizers.
Compared to the prior art, the apparent outstanding substantive distinguishing features had and remarkable advantage have in the present invention:
Light path system of the present invention is made up of static optical component completely, can reduce the control accuracy of light path.The extinction ratio of polarization maintaining optical fibre of the present invention can obtain in real time, and not needing to carry out process to the data in section sometime could obtain, and therefore can be used for the measurement of high speed fiber optic systems.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of one embodiment of the invention.
Fig. 2 is the structured flowchart of one embodiment of the invention.
Fig. 3 is the structured flowchart of one embodiment of the invention.
Fig. 4 is the structured flowchart of one embodiment of the invention.
Embodiment
Details are as follows by reference to the accompanying drawings for specific embodiment.
embodiment one:
See Fig. 1, a kind of polarization maintaining optical fibre extinction ratio real-time test device, comprises polarization maintaining optical fibre 1, optical fiber collimator 2, block circularly polarized light beam splitter 3, first photodetector 4, second photodetector 5 and signal processing unit 6; The polarized light that described polarization maintaining optical fibre 1 exports enters into described optical fiber collimator 2, obtain space optical signal, after described block circularly polarized light beam splitter 3, be divided into two bundle polarization directions orthogonal, and the circularly polarized light that the direction of propagation is separated, enter described first photodetector 4, second photodetector 5 respectively, after being converted to electric signal, entering signal processing unit 6 processes, and exports the extinction ratio of incident light.Above-mentioned block circularly polarized light beam splitter 3 comprises: wideband quarter wave plate 31 and block linearly polarized light beam splitter 32, left circularly polarized light in incident light and right-circularly polarized light are by after described wideband quarter wave plate 31, be converted to the linearly polarized light along wave plate two optical axis respectively, after described block linearly polarized light beam splitter 32, the space realizing two linearly polarized lights is separated.
embodiment two:
See Fig. 2, the present embodiment is substantially identical with embodiment one, difference is, above-mentioned block circularly polarized light beam splitter 3 comprises: the nonpolarized light beam splitter 33 of 50:50 and two circuit polarizers 34,35, incident light is by being divided into two beam powers equal after the nonpolarized light beam splitter 33 of described 50:50, the light that space is separated, respectively by described piece of circuit polarizer 34, after 35, leach left circularly polarized light and right-circularly polarized light, the further part process of access to plant.
embodiment three:
See Fig. 3, a kind of polarization maintaining optical fibre extinction ratio real-time test device, comprises polarization maintaining optical fibre 1, fiber adapter 7, optical-fiber type circularly polarized light beam splitter 8, first photodetector 4, second photodetector 5 and signal processing unit 6; The polarized light that described polarization maintaining optical fibre 1 exports is by after described fiber adapter 7 and described optical-fiber type circularly polarized light beam splitter 8, be divided into the circularly polarized light that two bundle polarization directions are orthogonal, enter the first photodetector 4, second photodetector 5 respectively, after being converted to electric signal, entering signal processing unit 6 processes, and exports the extinction ratio of incident light.Above-mentioned optical-fiber type circularly polarized light beam splitter 8 comprises: band optical fiber quarter-wave plate 81 and optical fiber cable polarization beam apparatus 82, left circularly polarized light in incident light and right-circularly polarized light are by after described band optical fiber quarter-wave plate 81, be converted to the linearly polarized light along polarization maintaining optical fibre two optical axis respectively, the output polarization maintaining optical fibre of band optical fiber quarter-wave plate 81 welds axle with the input polarization maintaining optical fibre of optical fiber cable polarization beam apparatus 82, two linearly polarized lights export from two output ports of described optical fiber cable polarising beam splitter respectively, the further part process of access to plant.
embodiment four:
See Fig. 4, the present embodiment is substantially identical with embodiment three, difference is, above-mentioned optical-fiber type circularly polarized light beam splitter 8 comprises: 3dB single-mode optical-fibre coupler 83 and two optical fiber circuit polarizers 84,85, incident light is by being divided into the equal light of two beam powers after described 3dB single-mode optical-fibre coupler 83, two output terminals of described single-mode optical-fibre coupler 83 respectively with described optical fiber circuit polarizer 84, the input end fiber of 85 is not welded axle, described optical fiber circuit polarizer 84,85 leach left circularly polarized light and right-circularly polarized light respectively after, the further part process of access to plant.
Claims (7)
1. a polarization maintaining optical fibre extinction ratio real-time test device, is characterized in that, comprises polarization maintaining optical fibre (1), optical fiber collimator (2), circularly polarized light beam splitter, the first photodetector (4), the second photodetector (5) and signal processing unit (6); The polarized light that described polarization maintaining optical fibre (1) exports is by after optical fiber collimator (2), enter circularly polarized light beam splitter, two mutually orthogonal circularly polarized light implementation spaces in polarized light are separated by described circularly polarized light beam splitter, one tunnel exports light and enters described first photodetector (4) by optical fiber collimator (2), and another road exports light and enters described second photodetector (5) by optical fiber collimator (2); The output of two photodetectors is all connected to described signal processing unit (6).
2. polarization maintaining optical fibre extinction ratio real-time test device according to claim 1, is characterized in that, described circularly polarized light beam splitter is bulk optical type circular polarization beam splitter (3).
3. polarization maintaining optical fibre extinction ratio real-time test device according to claim 2, is characterized in that, described bulk optical type circular polarization beam splitter (3) is made up of a wideband quarter wave plate (31) and a line polarizing beam splitter (32); Described wideband quarter wave plate (31) is parallel or vertical with the optical axis of described line polarizing beam splitter (32).
4. polarization maintaining optical fibre extinction ratio real-time test device according to claim 2, is characterized in that, described bulk optical type circular polarization beam splitter (3) is made up of a non-polarizing beamsplitter (33) and two circuit polarizers (34,35); The splitting ratio of described non-polarizing beamsplitter (33) is 50:50; The rotation direction of described two circuit polarizers (34,35) is orthogonal.
5. polarization maintaining optical fibre extinction ratio real-time test device according to claim 1, is characterized in that, described optical fiber collimator (2) fiber adapter (7) replaces, and described circularly polarized light beam splitter is optical-fiber type circularly polarized light beam splitter (8); After the polarized light that described polarization maintaining optical fibre (1) exports enters described optical-fiber type circularly polarized light beam splitter (8) by described fiber adapter (7), be divided into the circularly polarized light that two bundle polarization directions are orthogonal, one tunnel exports light and enters described first photodetector (4), and another road exports light and enters described second photodetector (5); The output of two photodetectors is all connected to described signal processing unit (6).
6. polarization maintaining optical fibre extinction ratio real-time test device according to claim 5, is characterized in that, described optical-fiber type circular polarization beam splitter (8) is made up of a band optical fiber quarter-wave plate (81) and an optical fiber molded line polarizing beam splitter (82); The input end polarization maintaining optical fibre not turning end polarization maintaining optical fibre and described optical fiber molded line polarizing beam splitter (82) of described band optical fiber quarter-wave plate (81) welds axle.
7. polarization maintaining optical fibre extinction ratio real-time test device according to claim 5, is characterized in that, described optical-fiber type circular polarization beam splitter (8) is made up of 3dB single-mode optical-fibre coupler (83) and two optical-fiber type circuit polarizers (84,85); The input end fiber of the described optical-fiber type circuit polarizer of two output terminal respectively with two (84,85) of described 3dB single-mode optical-fibre coupler (83) is not welded axle; The circularly polarized light that two described optical-fiber type circuit polarizers (84,85) export is mutually orthogonal.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891953A (en) * | 2016-06-15 | 2016-08-24 | 南方科技大学 | Device and method for manufacturing polarization maintaining optical fiber combiner |
| CN108398242A (en) * | 2018-01-31 | 2018-08-14 | 北京交通大学 | Elliptical polarization keeps the measuring device and method of optical fiber extinction ratio |
| CN111896231A (en) * | 2020-09-02 | 2020-11-06 | 北京浦丹光电股份有限公司 | Device and method for calibrating extinction ratio tester with wide-range adjustable extinction ratio |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109827758B (en) * | 2019-03-20 | 2020-11-03 | 北京大盟创业科技有限公司 | Polarization extinction ratio testing system of polarization-maintaining passive device |
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| JPS607333A (en) * | 1983-06-27 | 1985-01-16 | Nippon Telegr & Teleph Corp <Ntt> | Method and apparatus for measuring optical fiber for maintaining polarization |
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Cited By (5)
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| CN105891953B (en) * | 2016-06-15 | 2019-05-17 | 南方科技大学 | Device and method for manufacturing polarization maintaining optical fiber combiner |
| CN108398242A (en) * | 2018-01-31 | 2018-08-14 | 北京交通大学 | Elliptical polarization keeps the measuring device and method of optical fiber extinction ratio |
| CN108398242B (en) * | 2018-01-31 | 2019-11-26 | 北京交通大学 | The measuring device and method of elliptical polarization holding optical fiber extinction ratio |
| CN111896231A (en) * | 2020-09-02 | 2020-11-06 | 北京浦丹光电股份有限公司 | Device and method for calibrating extinction ratio tester with wide-range adjustable extinction ratio |
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| CN104897368B (en) | 2018-08-07 |
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