CN102253454A - All-optical fiber light splitting device - Google Patents
All-optical fiber light splitting device Download PDFInfo
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- CN102253454A CN102253454A CN201110087684XA CN201110087684A CN102253454A CN 102253454 A CN102253454 A CN 102253454A CN 201110087684X A CN201110087684X A CN 201110087684XA CN 201110087684 A CN201110087684 A CN 201110087684A CN 102253454 A CN102253454 A CN 102253454A
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Abstract
The invention discloses an all-optical fiber light splitting device, which comprises a fiber Bragg grating and an optical fiber wavelength division multiplexer, wherein the fiber Bragg grating is connected with an input end of the optical fiber wavelength division multiplexer; an incident optical signal S1 is separated into a reflected light signal S2 with a first part of wavelength and transmission light S3 with a second part of wavelength and a third part of wavelength through the fiber Bragg grating; and the transmission light S3 is separated into transmission light S4 with the second part of wavelength and transmission light S5 with the third part of wavelength through the optical fiber wavelength division multiplexer. Based on a common communication device, the device has a mature manufacturing process, low cost and high long-term reliability and is an all-optical fiber device.
Description
Technical field
The present invention relates to a kind of optics light-dividing device, the light-dividing device of the full fiberize in particularly a kind of distributed optical fiber temperature sensing system.
Background technology
Distributed optical fiber temperature sensing system (DTS) is a kind of emerging line style fire detecting system, in the highway communication tunnel, field such as high-tension cable ditch, coal conveyer belt, petrochemical industry chemical industry has than widespread use.This system not only can measure the size of temperature in real time, and can accurately locate fire location, have measuring distance long, do not have the blind area of measurement, anti-electromagnetic interference (EMI), advantage such as be fit to work under the rugged surroundings such as inflammable and explosive.
The measuring principle of DTS is spontaneous Raman scattering effect and optical time domain reflection technology.Laser pulse transmits in optical fiber, and laser and optical fiber interact, and most laser are transmission forward all, has only very little a part of light to produce backscattering.For the DTS system, back-scattering light mainly contains three wave bands, is respectively: the Reyleith scanttering light (λ the same with lambda1-wavelength
0), the stokes light (λ of temperature-insensitive
s) and temperature sensitive anti-Stokes light (λ
a).Utilize light-dividing device, isolate the stokes light of temperature sensitive anti-stoke light and temperature-insensitive, and utilize photodetector to survey, can obtain temperature value along fiber distribution according to the ratio of both light intensity.
Chinese patent ZL200820154032.7 discloses a kind of distributed optical fiber temperature sensing device, this device utilizes anti-Stokes lens and stokes lens to isolate the fiber raman scattering signal, it is a kind of space beam split light channel structure based on optical element, the light path complexity, to light path debugging precision prescribed height, reliability is low.
Chinese patent ZL201010133585.6 discloses a kind of distributed optical fiber Raman temperature sensor that embeds photoswitch, incident laser incides on the thermometric optical fiber through first output terminal of 1 * 3 optical fiber bidirectional coupler, the signal that the optical fiber each point returns is behind second output terminal and the 3rd output terminal of 1 * 3 optical fiber bidirectional coupler, through first optical filter and second optical filter, isolate anti-Stokes light and stokes light respectively respectively.This device optical path loss is bigger, is unfavorable for the detection of fiber raman scattering signal.
Summary of the invention
In order to solve above-mentioned deficiency of the prior art, the invention provides a kind of light-dividing device of simple in structure, full fiberize that reliability is high.
For achieving the above object, the present invention adopts following technical scheme:
A kind of light-dividing device of full fiberize, comprise fiber grating and optical fibre wavelength division multiplexer, close position between the two: the input end of fiber grating and optical fibre wavelength division multiplexer links to each other, and fiber grating is separated into the reflected light signal S2 with first's wavelength to the light signal S1 of incident and has the transmitted light S3 of second portion wavelength and third part wavelength; Optical fibre wavelength division multiplexer is separated into the transmitted light S4 with second portion wavelength to described transmitted light S3 and has the transmitted light S5 of third part wavelength.
The foveal reflex wavelength of described fiber grating is first's wavelength.
Described optical fibre wavelength division multiplexer is 1 * 2 fused tapered wavelength division multiplexer, and two output terminal separate wavelengths are respectively second portion wavelength and third part wavelength.
Fiber grating is a kind of wavelength selector spare, and it utilizes UV light to form the structure of refractive index periodic modulated on fiber core, by the design in the index modulation degree of depth and cycle, can realize the reflection of specific wavelength, and reflectivity can reach more than 95%.As a kind of device of full fiberize, be easy to produce in batches, good with the sensor-based system compatibility.Further reduce the transmitance of specific wavelength if desired, but the identical fiber grating of a plurality of foveal reflex wavelength of cascade.
The fused tapered optical fibre wavelength division multiplexer can realize that the flashlight of two wavelength separates, and isolation can reach 30dB.If need further to improve isolation, the output terminal of optical fibre wavelength division multiplexer is the more than one identical optical fibre wavelength division multiplexer of cascade again, perhaps the more than one fiber grating of cascade again.
Beneficial effect of the present invention: the light-dividing principle that the present invention is based on fiber grating filtering and fused tapered optical fibre wavelength division multiplexer, a kind of light-dividing device of full fiberize simple in structure is provided, realizes that first's wavelength, second portion wavelength separate with the third part wavelength.Fiber grating and fused tapered optical fibre wavelength division multiplexer are common communication device, the manufacture craft maturation, and cost is low, and is full fiberize device, need not the glue encapsulation, the long-term reliability height.
Description of drawings
Fig. 1 is the light-dividing device of a kind of full fiberize of the present invention;
Fig. 2 is a kind of light-dividing device that improves the full fiberize of first's wavelength isolation of the present invention;
Fig. 3 is the another kind of light-dividing device that improves the full fiberize of first's wavelength isolation of the present invention;
Fig. 4 is a kind of light-dividing device that improves the full fiberize of third part wavelength isolation of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is done further detailed description.
Embodiment 1:
As shown in Figure 1, a kind of light-dividing device of full fiberize comprises fiber grating 1 and optical fibre wavelength division multiplexer 2, and wherein wavelength division multiplexer 2 is 1 * 2 structure, comprise an input end 21 and two output terminals 22 and 23, described fiber grating 1 links to each other with the input end 21 of wavelength division multiplexer 2.
This light-dividing device is used for the separation of distributed fiber Raman sensor-based system back-scattering light S1, and scattered light S1 is the complex light that comprises three wavelength such as Rayleigh scattering light, anti-Stokes light and stokes light.The centre wavelength of described fiber grating 1 is Rayleigh scattering light, grid region length 12mm, and reflectivity is greater than 95%; Described optical fibre wavelength division multiplexer is a fused tapered, and separate wavelengths is anti-Stokes light and stokes light.After scattered light S1 incided described fiber grating 1, Rayleigh scattering light reflected, and transmission takes place the complex light S3 that includes anti-Stokes light and stokes light; Described S3 is through input end 21 incidents of optical fibre wavelength division multiplexer 2, anti-Stokes light transmitted light S4 and stokes light transmitted light S5 be respectively from the output terminal 22 and 23 outgoing of described wavelength division multiplexer, thereby realize separating of responsive to temperature signal and temperature-insensitive signal in the optical fiber back-scattering light.
Embodiment 2:
As shown in Figure 2, a kind of light-dividing device that improves the full fiberize of first's wavelength isolation, comprise first fiber grating 1, second fiber grating 3 and optical fibre wavelength division multiplexer 2, close their position: first fiber grating 1 links to each other with second fiber grating 3, and second fiber grating 3 links to each other with the input end 21 of optical fibre wavelength division multiplexer 2.The centre wavelength of described first fiber grating 1 and second fiber grating 3 is first's wavelength; Described optical fibre wavelength division multiplexer is a fused tapered, and separate wavelengths is second portion wavelength and third part wavelength.
Light-dividing device is used for the separation of the back-scattering light S1 of high-precision distributed Raman temp measuring system in this example, because Rayleigh scattering signal S2 is than the anti-Stokes light signal S4 and big two orders of magnitude of Stokes light signal S5, common fiber grating can only be realized the isolation about 15dB, for improving the isolation of first's wavelength, need the identical fiber grating cascade of a plurality of foveal reflex wavelength.Adopt the mode of first fiber grating 1 and 3 cascades of second fiber grating in this example, can reach more than the 30dB, satisfy high precision distributed measurement demand the isolation of described Rayleigh scattering light S2.
Embodiment 3:
As shown in Figure 3, a kind of light-dividing device that improves the full fiberize of first's wavelength isolation, comprise first fiber grating 1, second fiber grating 3 and optical fibre wavelength division multiplexer 2, close their position: first fiber grating 1 links to each other with the input end 21 of optical fibre wavelength division multiplexer 2, and the output terminal 22 of described optical fibre wavelength division multiplexer 2 links to each other with second fiber grating 3.The centre wavelength of described first fiber grating 1 and second fiber grating 3 is first's wavelength; Described optical fibre wavelength division multiplexer is a fused tapered, and separate wavelengths is second portion wavelength and third part wavelength.
In the present embodiment, second fiber grating, 3 diameters link to each other with the output terminal 22 of optical fibre wavelength division multiplexer 2, the centre wavelength of described fiber grating 3 is first's wavelength, can further reduce the scattered light of first's wavelength that wavelength division multiplexer 2 sneaks into, improve isolation described Rayleigh scattering light S2.
Embodiment 4:
As shown in Figure 4, a kind of light-dividing device that improves the full fiberize of third part wavelength isolation, comprise fiber grating 1, first optical fibre wavelength division multiplexer 2 and second optical fibre wavelength division multiplexer 4, close their position: fiber grating 1 links to each other with the input end 21 of first optical fibre wavelength division multiplexer 2, and the output terminal 22 of described first optical fibre wavelength division multiplexer 2 links to each other with the input end 41 of second optical fibre wavelength division multiplexer 4.The centre wavelength of described fiber grating 1 is first's wavelength; Described first optical fibre wavelength division multiplexer 2 and second optical fibre wavelength division multiplexer 4 are fused tapered, and separate wavelengths is second portion wavelength and third part wavelength.
In this example, second optical fibre wavelength division multiplexer 4 is used to improve the isolation of third part wavelength.Typical crosstalking of two output terminals of fused tapered wavelength division multiplexer is 15～25dB, if the signal of third part wavelength is more intense (for temperature-measuring system of distributed fibers, the signal intensity of the signal intensity ratio anti-Stokes light of stokes light scattered light is big about 8 times), then can exist the transmitted light S5 of fraction three-wavelength to sneak on the output terminal 22 of first optical fibre wavelength division multiplexer 2, by one second optical fibre wavelength division multiplexer 4 of cascade again on described output terminal 22, the transmitted light S5 of the fraction three-wavelength of then sneaking into can be by output terminal 43 outputs of second wavelength division multiplexer 4, the transmitted light S4 of second portion wavelength is then from output terminal 42 outgoing of second wavelength division multiplexer 4, reduce third part wavelength transmitted light S5 greatly, improve isolation described third part wavelength transmitted light S5.
Claims (6)
1. the light-dividing device of a full fiberize comprises fiber grating and optical fibre wavelength division multiplexer, it is characterized in that the pass, position of described fiber grating and optical fibre wavelength division multiplexer is:
The input end of fiber grating and optical fibre wavelength division multiplexer links to each other, and fiber grating is separated into the reflected light signal S2 with first's wavelength to the light signal S1 of incident and has the transmitted light S3 of second portion wavelength and third part wavelength;
Optical fibre wavelength division multiplexer is separated into the transmitted light S4 with second portion wavelength to described transmitted light S3 and has the transmitted light S5 of third part wavelength.
2. the light-dividing device of full fiberize according to claim 1, the foveal reflex wavelength that it is characterized in that described fiber grating is first's wavelength.
3. the light-dividing device of full fiberize according to claim 1 is characterized in that described optical fibre wavelength division multiplexer is 1 * 2 fused tapered wavelength division multiplexer, and two output terminal separate wavelengths are respectively second portion wavelength and third part wavelength.
4. the light-dividing device of full fiberize according to claim 1 is characterized in that described fiber grating is the cascade of the identical fiber grating of two above foveal reflex wavelength.
5. the light-dividing device of full fiberize according to claim 1, the output terminal that it is characterized in that described optical fibre wavelength division multiplexer is more than one optical fibre wavelength division multiplexer of cascade or fiber grating again.
6. the light-dividing device of full fiberize according to claim 1 is characterized in that described first wavelength is the Rayleigh scattering optical wavelength, and second portion wavelength and third part wavelength are respectively anti-Stokes wavelength and Stokes wavelength.
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| CN201110087684XA CN102253454A (en) | 2011-04-07 | 2011-04-07 | All-optical fiber light splitting device |
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| CN201110087684XA CN102253454A (en) | 2011-04-07 | 2011-04-07 | All-optical fiber light splitting device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983375A (en) * | 2014-04-17 | 2014-08-13 | 上海电控研究所 | Temperature self-sensing partial wave device and system |
| CN104625944A (en) * | 2015-02-26 | 2015-05-20 | 中国电子科技集团公司第四十四研究所 | Photonic crystal fiber end face polishing method and device obtained according to photonic crystal fiber end face polishing method |
| CN108318973A (en) * | 2018-04-02 | 2018-07-24 | 浙江师范大学 | A kind of the Raman wavelength division multiplexer and its manufacture craft of DTS |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1400453A (en) * | 2001-07-27 | 2003-03-05 | 中国计量学院 | Distributed optical fibre temperature sensor system |
| CN101162175A (en) * | 2007-11-15 | 2008-04-16 | 中国计量学院 | Ultra-remote distributed fiber raman photons temperature sensor integrated with raman amplifier |
| CN101222106A (en) * | 2007-12-26 | 2008-07-16 | 北京交通大学 | Novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser |
| CN101424624A (en) * | 2008-11-12 | 2009-05-06 | 西安金和光学科技有限公司 | Optical fibre grating sensor |
| CN202133797U (en) * | 2011-04-07 | 2012-02-01 | 杭州山旭光电有限公司 | All-fiber beam split device |
-
2011
- 2011-04-07 CN CN201110087684XA patent/CN102253454A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1400453A (en) * | 2001-07-27 | 2003-03-05 | 中国计量学院 | Distributed optical fibre temperature sensor system |
| CN101162175A (en) * | 2007-11-15 | 2008-04-16 | 中国计量学院 | Ultra-remote distributed fiber raman photons temperature sensor integrated with raman amplifier |
| CN101222106A (en) * | 2007-12-26 | 2008-07-16 | 北京交通大学 | Novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser |
| CN101424624A (en) * | 2008-11-12 | 2009-05-06 | 西安金和光学科技有限公司 | Optical fibre grating sensor |
| CN202133797U (en) * | 2011-04-07 | 2012-02-01 | 杭州山旭光电有限公司 | All-fiber beam split device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983375A (en) * | 2014-04-17 | 2014-08-13 | 上海电控研究所 | Temperature self-sensing partial wave device and system |
| CN104625944A (en) * | 2015-02-26 | 2015-05-20 | 中国电子科技集团公司第四十四研究所 | Photonic crystal fiber end face polishing method and device obtained according to photonic crystal fiber end face polishing method |
| CN108318973A (en) * | 2018-04-02 | 2018-07-24 | 浙江师范大学 | A kind of the Raman wavelength division multiplexer and its manufacture craft of DTS |
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