CN102799044B - Method and device for amplifying signal light of optical time-domain reflectometer of fusion Raman amplifier - Google Patents
Method and device for amplifying signal light of optical time-domain reflectometer of fusion Raman amplifier Download PDFInfo
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- CN102799044B CN102799044B CN201210326518.5A CN201210326518A CN102799044B CN 102799044 B CN102799044 B CN 102799044B CN 201210326518 A CN201210326518 A CN 201210326518A CN 102799044 B CN102799044 B CN 102799044B
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Abstract
The invention discloses a method for amplifying signal light of an optical time-domain reflectometer of a fusion Raman amplifier. The method comprises the following steps: a frequency shift optical fiber is arranged behind a high-power optical fiber pulse laser, so that the light emitted by the high-power optical fiber pulse laser forms frequency shift; the light emitted by the high-power optical fiber pulse laser is divided into two paths by a splitter which is connected with the frequency shift optical fiber; one path serves as pump light after passing through an A filter and the other path serves as the signal light after passing through a B filter; and the signal light is amplified by the pump light. The invention further discloses the optical time-domain reflectometer for realizing the method. According to the method and the device method for amplifying the signal light of the optical time-domain reflectometer of the fusion Raman amplifier, the disadvantage of decreasing the signal of an ordinary optical time-domain reflectometer along with the transmission distance is solved, and the measuring accuracy and the dynamic scope of the optical time-domain reflectometer can be greatly improved; and the factors of high cost and high non-stability can be solved when a non-linear effect light amplifier is adopted.
Description
Technical field
The present invention relates to a kind of flashlight amplification method and device of optical time domain reflectometer, particularly relate to a kind of the flashlight amplification method and the device that merge the optical time domain reflectometer of raman amplifier.
Background technology
Along with the development of society, optical fiber communication becomes current most important communication mode with the plurality of advantages such as Large Copacity, high speed, what the communication such as daily life, commercial exchange, national defence was all a large amount of uses optical fiber, optical time domain reflectometer (OTDR) is widely used among the maintenance of fibre circuit, construction, can carry out the measurement of fiber lengths, the transmission attenuation of optical fiber, joint decay and fault location etc.It has a very important parameter to be dynamic range, and practical significance is the maximum fiber length that the pulse grown most can reach, and dynamic range is larger, and the Distance geometry scope that can monitor is larger, is conducive to fast quick checking barrier and the block removing of fibre circuit.
When the light of optical time domain reflectometer transmits in a fiber, luminous power exponentially can decay with transmission range, and the distance of optical transport is longer, and the signal of scattering and reflection is less, which has limited the detection optical fiber length of optical time domain reflectometer.The main factor affecting optical time domain reflectometer dynamic range is the light energy and the back light Testing of Feeble Signals ability that enter detection optical fiber.Current common optical time domain reflectometer is all generally adopt the mode strengthening pulse duration to increase dynamic range, but this mode can make the positioning precision of system decline; Generally when detecting the optical fiber of more than 50km, be difficult to the positioning precision reaching less than 4 meters.Or adopt semiconductor optical amplifier (SOA) or mix terres rares image intensifer (EDFA, PDFA, TDFA) and amplify, both all can only amplify input signal light in optical fiber front end, cannot change the problem of luminous power with transmission range exponential damping.And adopt nonlinear effect image intensifer (as fiber Raman amplifier, optical fiber Brillouin amplifier) that distributed air-defense can be accomplished, namely in transmitting procedure, flashlight is amplified, solve the problem of luminous power with transmission range exponential damping, but nonlinear effect image intensifer needs light source, add cost and destabilizing factor.
Summary of the invention
The object of the present invention is to provide a kind of the flashlight amplification method and the device that merge the optical time domain reflectometer of raman amplifier.The shortcoming that the signal that the present invention can either solve common optical time domain reflectometer diminishes with Distance Transmission, increases substantially measurement accuracy and the dynamic range of optical time domain reflectometer; Sky high cost when adopting nonlinear effect image intensifer and higher destabilizing factor can be overcome again.
For solving the problems of the technologies described above, technical scheme provided by the invention is as follows: the flashlight amplification method merging the optical time domain reflectometer of raman amplifier: by arranging frequency shifted fiber after a high-power fiber pulse laser, the light that high-power fiber pulse laser is sent forms frequency displacement, splitter again by being connected with frequency shifted fiber, the light that high-power fiber pulse laser sends is divided into two-way, one tunnel after A filter as pump light, one tunnel as flashlight, is amplified flashlight with pump light after B filter.
The flashlight amplification method of the optical time domain reflectometer of aforesaid fusion raman amplifier, described flashlight first enters into detection optical fiber by fiber coupler, pump light is after one section postpones optical fiber, detection optical fiber is entered into again by fiber coupler, pump light amplifies flashlight at the encountered location with flashlight, and the flashlight after encountered location amplifies thereupon.
In the flashlight amplification method of the optical time domain reflectometer of aforesaid fusion raman amplifier, described delay fiber lengths is determined according to the encountered location of pump light and flashlight.
Realize the device (i.e. optical time domain reflectometer) of the flashlight amplification method of the optical time domain reflectometer of foregoing fusion raman amplifier: comprise a high-power fiber pulse laser, high-power fiber pulse laser connects the input of frequency shifted fiber; The output of frequency shifted fiber is connected with the input of splitter; The A output of splitter connects A filter, then is connected with the A input of fiber coupler after delayed optical fiber; The B output of splitter connects B filter, and the output of B filter is connected with the input of fiber coupler; The A output of fiber coupler connects detection optical fiber, after B output connects photoelectric conversion module, then is connected with data acquisition and signal processing module.
In aforesaid optical time domain reflectometer, the centre wavelength of described high-power fiber pulse laser is 1310nm, 1450nm or 1550nm, and laser pulse width is 10ns, and peak power is that 1W-1kW is adjustable, and repetition rate is that 500Hz-20KHz is adjustable.
In aforesaid optical time domain reflectometer, described frequency shifted fiber is the G652 monomode fiber of 500 meters-1200 meters.
In aforesaid optical time domain reflectometer, the centre wavelength of described A filter is consistent with the centre wavelength of high-power fiber pulse laser; The centre wavelength of described B filter is first Raman wavelength corresponding to the centre wavelength of high-power fiber pulse laser.
In aforesaid optical time domain reflectometer, described delay optical fiber is G652 monomode fiber.
Compared with prior art, the present invention adopts technique scheme, to change in conventional optical time domain reflectometer in original position just to the method that flashlight amplifies, Raman distributed amplification is carried out to the forward signal light in detection optical fiber, Raman distributed amplification is carried out to the forward signal light in detection optical fiber, flashlight after pump light and flashlight are met is exaggerated, 13dB can be reached, under the prerequisite not affecting positioning precision and measurement accuracy rate, greatly increase the dynamic range of optical time domain reflectometer, extend the fiber lengths that can detect; And the present invention turn avoid while meeting amplification condition adopt traditional nonlinear effect image intensifer time sky high cost, decrease failure rate, compare the optical time domain reflectometer adopting traditional nonlinear effect image intensifer, escapable cost of the present invention reaches 15%.
Accompanying drawing explanation
Fig. 1 is system construction drawing of the present invention.
Reference numeral
1-high-power fiber pulse laser, 2-frequency shifted fiber, 3-splitter, 4-A filter, 5-B filter, 6-postpones optical fiber, 7-fiber coupler, 8-photoelectric conversion module, 9-data acquisition and signal processing module, 10-detection optical fiber.
Below in conjunction with drawings and Examples, the present invention is further illustrated, but not as the foundation limited the present invention.
Embodiment
Embodiment.Merge the flashlight amplification method of the optical time domain reflectometer of raman amplifier: by arranging frequency shifted fiber after a high-power fiber pulse laser, the light that high-power fiber pulse laser is sent forms frequency displacement, splitter again by being connected with frequency shifted fiber, the light that high-power fiber pulse laser sends is divided into two-way, one tunnel after A filter as pump light, one tunnel as flashlight, is amplified flashlight with pump light after B filter.Carry out amplification with pump light to flashlight to be specially, flashlight first enters into detection optical fiber by fiber coupler, pump light is after one section postpones optical fiber, detection optical fiber is entered into again by fiber coupler, pump light amplifies flashlight at the encountered location with flashlight, and the flashlight after encountered location amplifies thereupon.Postpone fiber lengths to determine according to the encountered location of pump light and flashlight.
Realize an optical time domain reflectometer for the flashlight amplification method of the optical time domain reflectometer of foregoing fusion raman amplifier, as shown in Figure 1, comprise high-power fiber pulse laser 1, high-power fiber pulse laser 1 connects the input of frequency shifted fiber 2; The output of frequency shifted fiber 2 is connected with the input of splitter 3; The A output of splitter 3 connects A filter 4, then is connected with the A input of fiber coupler 7 after delayed optical fiber 6; The output of B output connection B filter 5, the B filter 5 of splitter 3 is connected with the input of fiber coupler 7; After A output connection detection optical fiber 10, the B output connection photoelectric conversion module 8 of fiber coupler 7, then be connected with data acquisition and signal processing module 9.The centre wavelength of high-power fiber pulse laser 1 is 1310nm, 1450nm or 1550nm, and laser pulse width is 10ns, and peak power is that 1W-1kW is adjustable, and repetition rate is that 500Hz-20KHz is adjustable.Frequency shifted fiber 2 is the G652 monomode fiber of 500 meters-1200 meters.The centre wavelength of A filter 4 is consistent with the centre wavelength of high-power fiber pulse laser 1; The centre wavelength of described B filter 5 is first Raman wavelength corresponding to the centre wavelength of high-power fiber pulse laser 1.Postponing optical fiber 6 is G652 monomode fiber.
In the present invention, produce the pulsed light of a Raman length (13.2THz) longer than power light source with a high-power fiber pulse laser and frequency shifted fiber, be referred to as Raman frequency shift, its principle is as follows:
When incident laser transmits in a fiber and optical fiber molecule produce nonlinear interaction scattering, release a phonon and be called Stokes Raman scattered photon, absorb a phonon and be called anti-Stokes Raman scattered photon.This is called fiber Raman frequency displacement.
v
as=v
0+Δv
v
s=v
0-Δv
V
as, v
sbe respectively anti-Stokes and Stokes Raman scattering frequency, v
0for the centre frequency of laser, Δ v is the frequency of optical fiber molecular vibration energy level, is 13.2THz.Fiber Raman frequency shifter can be made into thus.When incident laser exceedes certain threshold value, stokes light increases fast, and the power of most of incident light can convert stokes light to, and has amplification, and gain can suppress the loss of optical fiber.
Distributed raman amplification principle is identical with Raman frequency shift principle, and the gain of fiber Raman amplifier is:
Wherein g
rfor Raman coefficient, P
0for input optical power, L
efffor the effective interaction length of optical fiber, A
effit is optical fiber effective area.Pump light differs a Raman wavelength with flashlight, in pump light transmits in detection optical fiber, along with transmission range increases, stokes light is constantly accumulated, and gain increases fast, amplifies the flashlight of co-wavelength, multiplication factor is relevant with pumping light power, and maximum can be 13dB.
The speed that light transmits in a fiber is relevant with wavelength, for monomode fiber, wavelength is longer, and speed is slower, and flashlight is longer than pump wavelength, speed is slower, if these two pulsed lights enter optical fiber simultaneously, stimulated Raman scattering can not be there is in front end, so add delay optical fiber in the present invention, the length postponing optical fiber can control the encountered location of pump light and flashlight, the namely position of Raman amplifiction starting point.
Wherein l is the length postponing optical fiber, and L is the fiber lengths of engagement point.The fiber position needing amplification point can be determined, the length of computing relay optical fiber according to the amplitude of flashlight transmission attenuation.
Optical time domain reflectometer of the present invention uses with conventional optical time domain reflectometer similar, detection optical fiber 10 is connected by fiber coupler 7, reverse signal light after detection enters photoelectric conversion module 8 through fiber coupler 7 again, and photoelectric conversion module 8 reverse signal light is converted into the signal of telecommunication and delivers to data acquisition and signal processing module 9.
Claims (6)
1. merge the flashlight amplification method of the optical time domain reflectometer of raman amplifier, it is characterized in that: by arranging frequency shifted fiber after a high-power fiber pulse laser, the light that high-power fiber pulse laser is sent forms frequency displacement, splitter again by being connected with frequency shifted fiber, the light that high-power fiber pulse laser sends is divided into two-way, one tunnel is as pump light after A filter, and a road as flashlight, is amplified flashlight with pump light after B filter; Described flashlight first enters into detection optical fiber by fiber coupler, pump light is after one section postpones optical fiber, enter into detection optical fiber by fiber coupler again, pump light amplifies flashlight at the encountered location with flashlight, and the flashlight after encountered location amplifies thereupon; The centre wavelength of described A filter is consistent with the centre wavelength of high-power fiber pulse laser; The centre wavelength of described B filter is first Raman wavelength corresponding to the centre wavelength of high-power fiber pulse laser.
2. the flashlight amplification method of the optical time domain reflectometer of fusion raman amplifier according to claim 1, is characterized in that: described delay fiber lengths is determined according to the encountered location of pump light and flashlight.
3. one kind realizes the device of the flashlight amplification method of the optical time domain reflectometer of the fusion raman amplifier described in claim 1 or 2, it is characterized in that: comprise high-power fiber pulse laser (1), high-power fiber pulse laser (1) connects the input of frequency shifted fiber (2); The output of frequency shifted fiber (2) is connected with the input of splitter (3); The A output of splitter (3) connects A filter (4), more delayed optical fiber (6) is connected with the A input of fiber coupler (7) afterwards; The B output of splitter (3) connects B filter (5), and the output of B filter (5) is connected with the B input of fiber coupler (7); The A output of fiber coupler (7) connects detection optical fiber, and B output is connected with data acquisition and signal processing module (9) after connecting photoelectric conversion module (8) again; The centre wavelength of described A filter (4) is consistent with the centre wavelength of high-power fiber pulse laser (1); The centre wavelength of described B filter (5) is first Raman wavelength corresponding to the centre wavelength of high-power fiber pulse laser (1).
4. the device realizing the flashlight amplification method of the optical time domain reflectometer merging raman amplifier according to claim 3, it is characterized in that: the centre wavelength of described high-power fiber pulse laser (1) is 1310nm, 1450nm or 1550nm, laser pulse width is 10ns, peak power is that 1W-1kW is adjustable, and repetition rate is that 500Hz-20KHz is adjustable.
5. the device realizing the flashlight amplification method of the optical time domain reflectometer merging raman amplifier according to claim 3, is characterized in that: described frequency shifted fiber (2) is the G652 monomode fiber of 500 meters-1200 meters.
6. the device realizing the flashlight amplification method of the optical time domain reflectometer merging raman amplifier according to claim 3, is characterized in that: described delay optical fiber (6) is G652 monomode fiber.
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| CN106451056A (en) * | 2016-12-14 | 2017-02-22 | 上海理工大学 | Active amplification type optical parameter oscillation feedback system |
| CN111162834B (en) * | 2018-11-07 | 2021-11-02 | 中国移动通信集团湖南有限公司 | Optical time domain reflectometer testing method and optical time domain reflectometer |
| CN114744480B (en) * | 2021-01-07 | 2024-05-28 | 中国石油天然气集团有限公司 | Light distribution type amplifying structure |
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| CN101162158A (en) * | 2007-11-15 | 2008-04-16 | 中国计量学院 | Ultra-remote distributed fiber raman and brillouin photons sensor |
| CN102012283A (en) * | 2010-10-29 | 2011-04-13 | 上海华魏光纤传感技术有限公司 | Detection-type distributed optical fiber temperature sensor with double inputs by single light source |
| CN202710286U (en) * | 2012-09-06 | 2013-01-30 | 杭州欧忆光电科技有限公司 | Time domain reflectometer fused with Raman amplifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101162158A (en) * | 2007-11-15 | 2008-04-16 | 中国计量学院 | Ultra-remote distributed fiber raman and brillouin photons sensor |
| CN102012283A (en) * | 2010-10-29 | 2011-04-13 | 上海华魏光纤传感技术有限公司 | Detection-type distributed optical fiber temperature sensor with double inputs by single light source |
| CN202710286U (en) * | 2012-09-06 | 2013-01-30 | 杭州欧忆光电科技有限公司 | Time domain reflectometer fused with Raman amplifier |
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Effective date of registration: 20151216 Address after: 264209 -6, Torch Road 159, hi tech Zone, Shandong, Weihai, six - Seven Patentee after: WEIHAI BEIYANG PHOTOELECTRIC INFORMATION TECHNOLOGY Co.,Ltd. Address before: 310018, Hangzhou, Zhejiang, Jianggan District province Xiasha Eastern High School Eastern Street No. 258, North building, B203 Patentee before: HANGZHOU OE PHOTOELECTRIC TECHNOLOGY Co.,Ltd. |
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