CN103727969B - Based on delay pulse Raman amplifiction distributed sensing system - Google Patents
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- CN103727969B CN103727969B CN201410010974.8A CN201410010974A CN103727969B CN 103727969 B CN103727969 B CN 103727969B CN 201410010974 A CN201410010974 A CN 201410010974A CN 103727969 B CN103727969 B CN 103727969B
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Abstract
The invention discloses a kind of based on delay pulse Raman amplifiction distributed sensing system, including narrow linewidth light source, raman pump light source, the first modulation module being connected with narrow linewidth light source and the second modulation module being connected with raman pump light source, described first modulation module passes sequentially through EDFA Erbium-Doped Fiber Amplifier, circulator is connected with wavelength division multiplexer, described second modulation module is directly connected with wavelength division multiplexer, described wavelength division multiplexer connects sensor fibre, connected by signal generator between described first modulation module and the second modulation module, described circulator passes through wave filter and detector, data acquisition module, computer is sequentially connected with.The present invention realizes the longer effective distance sensing of detection light by having the impulse modulation pumping Raman amplification of certain time-delay amount.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, especially a kind of based on delay pulse Raman amplifiction distributed sensing system
System.
Background technology
Along with the development of society, people are increasingly severe to the dependence of information, and the demand of information transmission drastically expands, significantly
Degree promotes the capacity of existing fiber system, increases the simple transmission distance without electrically regenerative relaying, has become as fiber optic communication field
Focus.Under this background, raman amplifier is extensively closed due to its intrinsic low noise and the widest bandwidth characteristic
Note.
So-called Raman amplifiction, is to be transferred on the stokes wave that frequency is lower than it by a part of incident optical power, if
One weak signal ripple and a heavy pumping light wave transmit simultaneously in a fiber, and make weak signal wavelength be placed in the Raman gain of pump light
In bandwidth, flashlight i.e. can be amplified.
Pumped distributed raman amplification is widely used for the distance of Time Domain Reflectometry type distributed sensing system and prolongs
Stretch, but be characterized in that the enlarge-effect at nearly pumping end is the most notable, cause the nonlinear effect of the detection light being exaggerated at nearly pump
Pu end the most promptly accumulates, thus deteriorates the quality of detection optical signal, and and then affects the extension of distance sensing.
Distributed sensing system type includes: phase sensitive optical time domain reflectometer (Ф-OTDR), polarization sensitive optical time domain are anti-
Penetrate instrument (POTDR) and Brillouin optical time-domain reflectometer (BOTDR) etc..Distributed sensing system has electromagnetism interference, sensitive
Degree is high, measure the plurality of advantages such as distance, and having in terms of the distance periphery intrusion preventings such as oil pipeline, airport, national boundaries can not
The advantage substituted.Existing distributed sensing system, in order to extend distance sensing, improves sensitivity, and the general mode used is to increase
Add raman pump power, but simple raising raman pump power, the non-thread such as easily cause Self-phase modulation, modulation unstable
The generation of property effect, thus reduce signal to noise ratio, limit distance sensing.
Summary of the invention
It is an object of the invention to: for the problem of above-mentioned existence, it is provided that a kind of pulse by having certain time-delay amount
Modulated pumping Raman amplifiction realizes the distributed sensing system of the longer detection effective distance sensing of light.
The technical solution used in the present invention is as follows:
The present invention provides a kind of based on delay pulse Raman amplifiction distributed sensing system, including narrow linewidth light source, Raman
The first modulation module that pump light source is connected with narrow linewidth light source and the second modulation module being connected with raman pump light source, institute
State that the first modulation module passes sequentially through EDFA Erbium-Doped Fiber Amplifier, circulator is connected with wavelength division multiplexer, described second modulation module
Directly being connected with wavelength division multiplexer, described wavelength division multiplexer connects sensor fibre, described first modulation module and the second modulation mould
Being connected by signal generator between block, described circulator is by wave filter with detector, data acquisition module, computer successively
Connect.
Making such scheme further preferably, described circulator has port one, port two and port three, described port one
Being connected with EDFA Erbium-Doped Fiber Amplifier, described port two is connected with wavelength division multiplexer, and described port three is connected with wave filter.
Making such scheme further preferably, described signal generator produces signal and triggers the first modulation module and the simultaneously
Two modulation modules produce the identical light pulse modulated signal of two-way frequencies, and the pump light of described raman pump light source output is by the
One modulation module produce have the pumping pulse of certain time-delay amount laggard enter wavelength division multiplexer, the spy of described narrow linewidth light source output
Light-metering produces direct impulse by the second modulation module and is amplified through EDFA Erbium-Doped Fiber Amplifier, the direct impulse after amplification
Entering wavelength division multiplexer by circulator, pumping pulse and direct impulse are carried out being coupled into sense light by described wavelength division multiplexer
Propagating in fibre, when traveling to the ad-hoc location of sensor fibre, pumping pulse starts to overlap with direct impulse, opens from this ad-hoc location
Beginning, direct impulse can continue to be amplified by pumping pulse, and direct impulse constantly reverse towards the direction of propagation in communication process
Rayleigh scattering occurs, and scattered light enters wave filter through the port three of circulator and filters the impact that noise brings, after filtering noise
Scattered light enter detector carry out opto-electronic conversion, the data of opto-electronic conversion are by data collecting module collected and send computer to
It is analyzed processing the characteristic drawing scattered light.
Making such scheme further preferably, the amount of delay of pumping pulse depends on that detecting light walks off with the relative of pump light
Degree and the design parameter of sensor-based system, control program or delay line by signal generator control.
Make such scheme further preferably, to obtain enough distributed raman amplifications, then pumping in order to ensure detection light
The pulsewidth of pulse should noticeably greater than detect light, i.e. in order to ensure pumping pulse after meeting with direct impulse, can constantly with
Direct impulse coincidence is until sensor fibre end, it is therefore desirable to use two modulation modules to carry out detection light and pump light respectively
Modulation, produces direct impulse and the pumping pulse with distinct pulse widths.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
1. the present invention uses the pulse pump Raman amplifiction with certain time-delay amount to replace traditional continuous light pumping Raman
Amplify, respectively detection light is carried out impulse modulation with pump light, and produce certain amount of delay between；Via mixing bait light
The direct impulse that fiber amplifier amplifies, sufficiently strong in the front signal of sensor fibre, it is not necessary to be exaggerated, along with distance sensing
Extending, direct impulse intensity reduces, and the pumping pulse now with certain time-delay just starts to produce excited Raman with direct impulse
Scattering, it is ensured that direct impulse has sufficiently strong signal on longer sensor fibre, slow down direct impulse frequency spectrum simultaneously
Broadening, and ensure that the coherence of detection light, reduce the impact that nonlinear effect is brought.
2. emulating detection light along the power distribution of optical fiber according to related data, Raman pump is with detection light respectively
When starting to have an effect at 0km and at 10km, set corresponding detection light peak power and be respectively 337mW, 500mW, note
The power entering pumping is respectively 1110mW, 600mW.Drawn significantly less than continuous light by the nonlinear phase shift calculating this system
Graceful amplification, the Nonlinear Cumulative effect i.e. caused is less, is conducive to reducing the broadening of detecting optical pulses frequency spectrum, it is ensured that detection light
Coherence, thus extend detection light distance sensing, there is important practical value.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is structural representation based on delay pulse Raman amplifiction distributed sensing system of the present invention；
Fig. 2 is the schematic diagram that the pumping pulse with amount of delay in the embodiment of the present invention interacts with direct impulse；
Fig. 3 is the power profile of the detection light in the embodiment of the present invention when diverse location injects pumping light.
In Fig. 1: 1 is narrow linewidth light source；2 is raman pump light source；3 is the first modulation module；4 put for erbium-doped fiber
Big device；5 is signal generator；6 is the second modulation module；7 is wavelength division multiplexer；8 is sensor fibre；9 is annular
Device；10
For wave filter；11 is detector；12 is data acquisition module；13 is computer.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is elaborated.
It is illustrated in figure 1 structural representation based on delay pulse Raman amplifiction distributed sensing system of the present invention,
This system includes the first modulation module 3 that narrow linewidth light source 1, raman pump light source 2 are connected with narrow linewidth light source 1
And the second modulation module 6 being connected with raman pump light source 2, described first modulation module 3 passes sequentially through EDFA Erbium-Doped Fiber Amplifier
4, circulator 9 is connected with wavelength division multiplexer 7, and described second modulation module 6 is directly connected with wavelength division multiplexer 7, and described wavelength-division is multiple
Connect sensor fibre 8 with device 7, be connected by signal generator 5 between described first modulation module 3 and the second modulation module 6, institute
State circulator 9 to be sequentially connected with detector 11, data acquisition module 12, computer 13 by wave filter 10.
Described circulator 9 has port one, port two and port three, and described port one is connected with EDFA Erbium-Doped Fiber Amplifier 4,
Described port two is connected with wavelength division multiplexer 7, and described port three is connected with wave filter 10.
Described signal generator 5 produces signal and triggers the first modulation module 3 and the second modulation module 6 produces two-way frequency simultaneously
The light pulse modulated signal that rate is identical, the pump light of described raman pump light source 2 output is produced by the first modulation module 3 to be had
The pumping pulse of certain time-delay amount laggard enter wavelength division multiplexer 7, the detection light of described narrow linewidth light source 1 output is by the second modulation
Module 6 produces direct impulse and is amplified through EDFA Erbium-Doped Fiber Amplifier 4, and the direct impulse after amplification is entered by circulator 9
Entering wavelength division multiplexer 7, pumping pulse and direct impulse are carried out being coupled in sensor fibre 8 by described wavelength division multiplexer 7 propagates,
When traveling to the ad-hoc location of sensor fibre 8, pumping pulse starts to overlap with direct impulse, from the beginning of this ad-hoc location, and detection
Pulse can continue to be amplified by pumping pulse, and direct impulse constantly inversely occurs Rayleigh towards the direction of propagation in communication process
Scattering, scattered light enters wave filter 10 through the port three of circulator 9 and filters the impact that noise brings, filters the scattering after noise
Light enters detector 11 and carries out opto-electronic conversion, and the data of opto-electronic conversion are gathered and send to computer 13 by data acquisition module 12
It is analyzed processing the characteristic drawing scattered light.
In such scheme, the periodic pumping pulse of generation, its pulse width depends primarily on the length of sensor fibre 8
Degree.
The amount of delay of pumping pulse depends on detecting the light tool that walk off degree and this sensor-based system relative with pump light
Body parameter, control program or delay line by signal generator 5 control.
The amplification of direct impulse is closely related with the amount of delay of pumping pulse.
Due to the GVD in sensor fibre 8 and the difference on the frequency between pump light and detection light so that pumping pulse
And there is gap in the spread speed between direct impulse, therefore can carry out tuning pump pulse by setting amount of delay and exist with direct impulse
The position overlapped in sensor fibre 8.
Obtain enough distributed raman amplifications in order to ensure detection light, then the pulsewidth of pumping pulse should noticeably greater than detect
Light, i.e. in order to ensure pumping pulse after meeting with direct impulse, can overlap until sensor fibre constantly with direct impulse
End, it is therefore desirable to use two modulation modules that detection light and pump light are modulated respectively, produce and there is distinct pulse widths
Direct impulse and pumping pulse.
Embodiment
For the nonlinear effect caused by the brightest raising pump power, with the G.652 optical fiber of 50km it is
Example.Owing to the pulse of different wave length is transmitted the most at different rates, the detection light of 1550nm and the pump light of 1455nm
Producing group-velocity mismatch, this characteristic result in and walks off phenomenon, and its dispersion parameter is:
Therefore, the pumping pulse for speed is had an effect with the direct impulse transmitting slower, it is necessary to assure pumping pulse is deposited
In certain time delay.As a example by time delay 10ns, then pumping pulse will at 10km with direct impulse generation stimulated Raman scattering,
Thus amplify detection optical signal.It is illustrated in figure 2 the schematic diagram that the pumping pulse with amount of delay interacts with direct impulse.
In order to illustrate that this distributed sensing system based on delay pulse Raman amplifiction contributes to reducing non-thread further
Property effect, pumping pulse is deferred at 10km with overlapping of direct impulse, occurs with pumping pulse at 0km and direct impulse
The effect of effect (i.e. pump light is continuous light) compares, and is emulated relevant data by computer, obtains 1550nm
The power profile of detection light, as shown in Figure 3.Now, at 0km and at 10km, Raman pump starts to have an effect with detection light
Time, corresponding detection light peak power is respectively 337mW, 500mW, and the power injecting pumping is respectively 1110mW, 600mW.
Computing formula according to nonlinear phase shift:
Calculating is learnt: 0km starts the nonlinear phase shift of Raman amplifiction and is
10km starts the nonlinear phase shift of Raman amplifiction
It follows that the nonlinear phase shift caused by injection of time delay 10ns pumping pulse is significantly less than pump light for even
Nonlinear phase shift caused during continuous light, i.e. the impact of the video stretching that nonlinear effect is brought is less, favorably
In the Fibre Optical Sensor realizing longer distance.
The invention is not limited in aforesaid detailed description of the invention.The present invention extends to and any discloses in this manual
New feature or any new combination, and the arbitrary new method that discloses or the step of process or any new combination.
Claims (1)
1. one kind based on delay pulse Raman amplifiction distributed sensing system, it is characterised in that: include narrow linewidth light source (1), draw
The first modulation module (3) that graceful pump light source (2) is connected with narrow linewidth light source (1) and be connected with raman pump light source (2)
Two modulation modules (6), described first modulation module (3) passes sequentially through EDFA Erbium-Doped Fiber Amplifier (4), circulator (9) with wavelength-division again
Connecting with device (7), described second modulation module (6) is directly connected with wavelength division multiplexer (7), and described wavelength division multiplexer (7) connects
Sensor fibre (8), is connected by signal generator (5) between described first modulation module (3) and the second modulation module (6), institute
State circulator (9) to be sequentially connected with detector (11), data acquisition module (12), computer (13) by wave filter (10)；Institute
Stating circulator (9) and have port one, port two and port three, described port one is connected with EDFA Erbium-Doped Fiber Amplifier (4), described end
Mouth two is connected with wavelength division multiplexer (7), and described port three is connected with wave filter (10).
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| CN104296857B (en) * | 2014-10-11 | 2017-06-20 | 深圳艾瑞斯通技术有限公司 | Optical fiber vibration sensing system and fiber-optic vibration detection device based on ATCA |
| CN104776870B (en) * | 2014-12-25 | 2018-07-03 | 长城信息产业股份有限公司 | The device of remote BOTDR system temperature resolution is improved using distributed raman amplification and EDFA technologies |
| CN109120336B (en) * | 2018-09-29 | 2021-03-09 | 合肥工业大学 | False alarm prevention and false alarm prevention method based on phase sensitive optical time domain reflection sensor |
| CN113433072B (en) * | 2020-03-23 | 2023-04-28 | 香港理工大学深圳研究院 | Gas concentration sensor and gas concentration detection device |
| CN111964700B (en) * | 2020-08-28 | 2021-06-04 | 武汉理工大学 | Distributed pulse light amplifier based on optical fiber parametric amplification and performance characterization method |
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