CN202133797U - All-fiber beam split device - Google Patents
All-fiber beam split device Download PDFInfo
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- CN202133797U CN202133797U CN201120100846U CN201120100846U CN202133797U CN 202133797 U CN202133797 U CN 202133797U CN 201120100846 U CN201120100846 U CN 201120100846U CN 201120100846 U CN201120100846 U CN 201120100846U CN 202133797 U CN202133797 U CN 202133797U
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- fiber grating
- division multiplexer
- optical fibre
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Abstract
The present utility model discloses an all-fiber beam split device which comprises a fiber grating and a fiber wavelength division multiplexing device. The fiber grating is connected with the input end of the fiber wavelength division multiplexing device, an incident light signal S1 is separated into a reflected light signal S2 provided with the first part of wavelength and a transmission light S3 provided with the second part of wavelength and the third part of wavelength by the fiber grating, and the transmission light S3 is separated into a transmission light S4 provided with the second part of wavelength and a transmission light S5 provided with the third part of wavelength by the fiber wavelength division multiplexing device. The device is based on the common communication device, the making technology is mature, the cost is low, and the all-fiber beam split device has high long-time reliability.
Description
Technical field
The utility model 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; Light path is complicated, and high to light path debugging precision prescribed, 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 utility model provides a kind of light-dividing device of simple in structure, full fiberize that reliability is high.
For realizing above-mentioned purpose, the utility model adopts following technical scheme:
A kind of light-dividing device of full fiberize; Comprise fiber grating and optical fibre wavelength division multiplexer; Position relation between the two is: the input end of fiber grating and optical fibre wavelength division multiplexer links to each other, and fiber grating is separated into the light signal S 1 of incident reflected light signal S2 with first's wavelength and the transmitted light S3 with second portion wavelength and third part wavelength; Optical fibre wavelength division multiplexer is separated into described transmitted light S3 transmitted light S4 with second portion wavelength and the transmitted light S5 with 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 on fiber core, to form the structure of refractive index periodic modulated, through 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 more than one optical fibre wavelength division multiplexer of cascade or the more than one fiber grating of cascade again.
The beneficial effect of the utility model: the utility model is based on the light-dividing principle of 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, and manufacture craft is ripe, and cost is low, and is full fiberize device, need not the glue encapsulation, and long-term reliability is high.
Description of drawings
Fig. 1 is the light-dividing device of a kind of full fiberize of the utility model;
Fig. 2 is a kind of light-dividing device that improves the full fiberize of first's wavelength isolation of the utility model;
Fig. 3 is that the another kind of the utility model improves the light-dividing device of the full fiberize of first's wavelength isolation;
Fig. 4 is a kind of light-dividing device that improves the full fiberize of third part wavelength isolation of the utility model.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model 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, their position relation is: 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 instance; Because Rayleigh scattering signal S2 is than anti-Stokes light signal S4 and big two one 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 instance, can reach more than the 30dB, satisfy high precision distributed measurement demand the isolation of said 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, their position relation is: 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 said 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 said 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 said 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, their position relation is: 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 said 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 instance, 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; Through one second optical fibre wavelength division multiplexer 4 of cascade again on said output terminal 22, the transmitted light S5 of the fraction three-wavelength of then sneaking into can be through output terminal 43 outputs of second wavelength division multiplexer 4, and 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 said 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 position relation 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 light signal S1 of incident reflected light signal S2 with first's wavelength and the transmitted light S3 with second portion wavelength and third part wavelength;
Optical fibre wavelength division multiplexer is separated into described transmitted light S3 transmitted light S4 with second portion wavelength and the transmitted light S5 with 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 more than one 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120100846U CN202133797U (en) | 2011-04-07 | 2011-04-07 | All-fiber beam split device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120100846U CN202133797U (en) | 2011-04-07 | 2011-04-07 | All-fiber beam split device |
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| Publication Number | Publication Date |
|---|---|
| CN202133797U true CN202133797U (en) | 2012-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201120100846U Expired - Lifetime CN202133797U (en) | 2011-04-07 | 2011-04-07 | All-fiber beam split device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253454A (en) * | 2011-04-07 | 2011-11-23 | 杭州山旭光电有限公司 | All-optical fiber light splitting device |
| CN103048305A (en) * | 2012-12-07 | 2013-04-17 | 中国科学院西安光学精密机械研究所 | All-fiber laser Raman testing device |
-
2011
- 2011-04-07 CN CN201120100846U patent/CN202133797U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253454A (en) * | 2011-04-07 | 2011-11-23 | 杭州山旭光电有限公司 | All-optical fiber light splitting device |
| CN103048305A (en) * | 2012-12-07 | 2013-04-17 | 中国科学院西安光学精密机械研究所 | All-fiber laser Raman testing device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120201 |
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| DD01 | Delivery of document by public notice |
Addressee: Xiao Bo Document name: Notice of termination of patent right |