CN112038878B - Distributed fiber optic acoustic wave sensing system based on remote pump amplifier and Raman amplifier - Google Patents
Distributed fiber optic acoustic wave sensing system based on remote pump amplifier and Raman amplifier Download PDFInfo
- Publication number
- CN112038878B CN112038878B CN202011001965.4A CN202011001965A CN112038878B CN 112038878 B CN112038878 B CN 112038878B CN 202011001965 A CN202011001965 A CN 202011001965A CN 112038878 B CN112038878 B CN 112038878B
- Authority
- CN
- China
- Prior art keywords
- pump
- light
- circulator
- amplifier
- fiber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
- H01S3/094046—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser of a Raman fibre laser
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1301—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Lasers (AREA)
Abstract
Description
技术领域technical field
本发明属于光纤传感领域,具体涉及一基于远泵放大器和拉曼放大器的分布式光纤声波传感系统。The invention belongs to the field of optical fiber sensing, in particular to a distributed optical fiber acoustic wave sensing system based on a remote pump amplifier and a Raman amplifier.
背景技术Background technique
分布式光纤声波传感系统(简称DAS)发射脉冲激光到传感光纤中,在光注入端接收光纤中自发的背向瑞利散射的相干光。通过检测外部振动导致的相干光强度变化来感知光纤所收到的外部扰动以获得振动信息。这种技术方法具有灵敏度高、测量响应速度快且能够实现长距离全分布式传感,适合对微扰动时间的监测,在大型建筑结构安全防护、重要场所的周界安防等领域有着广泛的应用。The Distributed Fiber Acoustic Sensing System (DAS for short) transmits pulsed laser light into the sensing fiber, and receives the spontaneous back-Rayleigh scattered coherent light in the fiber at the light injection end. The vibration information can be obtained by sensing the external disturbance received by the fiber by detecting the coherent light intensity change caused by external vibration. This technical method has high sensitivity, fast measurement response speed, and can realize long-distance and fully distributed sensing. It is suitable for monitoring the micro-disturbance time. .
光纤声波传感系统在实际工程应用中,由于光缆的实际损耗比较大,或者光缆长度超出了DAS所能达到的最远距离,此时需要将信号光放大。传感测量一般都利用已经敷设好的光缆来进行,有的工程现场光缆的长度比较长,超越了DAS所能测量的最大长度。或者即使光缆长度在DAS所能测量的最大长度之内,但由于各种原因,光缆的传输损耗比较大。In the actual engineering application of the fiber optic acoustic wave sensing system, the signal light needs to be amplified because the actual loss of the fiber optic cable is relatively large, or the length of the fiber optic cable exceeds the farthest distance that the DAS can reach. The sensing measurement is generally carried out by using the already laid optical cable. The length of the optical cable in some engineering sites is relatively long, which exceeds the maximum length that can be measured by DAS. Or even if the length of the optical cable is within the maximum length that can be measured by DAS, the transmission loss of the optical cable is relatively large due to various reasons.
布里渊放大器也是分布式放大器,但是布里渊放大器的带宽很窄,并且受温度影响很大,从而影响传输信号的放大,不适合用于DAS传感系统中。The Brillouin amplifier is also a distributed amplifier, but the bandwidth of the Brillouin amplifier is very narrow and is greatly affected by temperature, which affects the amplification of the transmitted signal, and is not suitable for use in DAS sensing systems.
发明内容SUMMARY OF THE INVENTION
针对现有技术中存在的问题,本发明提供一种基于远泵放大器和拉曼放大器的分布式光纤声波传感系统,本发明部分实施例将无中继光通信系统中应用的远泵放大器或者拉曼放大器应用在光纤声波传感系统中,这两种技术可以大幅度提升现有光纤系统的容量,增加传感系统的探测距离,降低系统的成本从而广泛应用于长距离光纤通信系统、光纤传感系统以及科学研究等领域,同时将这两种技术应用到光纤声波传感系统中来提升系统的传感距离。In view of the problems existing in the prior art, the present invention provides a distributed optical fiber acoustic wave sensing system based on a remote pump amplifier and a Raman amplifier. Raman amplifiers are used in fiber optic acoustic wave sensing systems. These two technologies can greatly increase the capacity of existing fiber optic systems, increase the detection distance of sensing systems, and reduce system costs, so they are widely used in long-distance fiber optic communication systems, fiber optic At the same time, these two technologies are applied to the optical fiber acoustic wave sensing system to improve the sensing distance of the system.
为实现上述目的,本发明采用以下技术方案:To achieve the above object, the present invention adopts the following technical solutions:
基于远泵放大器和拉曼放大器的分布式光纤声波传感系统,所述光纤声波传感系统包括:振动探测单元,提供信号光;第一激光源,提供第一泵浦光;第一传感光纤,所述第一传感光纤的首端接收所述第一泵浦光与信号光的合束光;远泵放大器模块,所述远泵放大器模块与所述第一传感光纤的尾端连接,所述远泵放大器包括用来放大输入中所述信号光的掺铒光纤;第二传感光纤,所述第二传感光纤的首端接收所述远泵放大器模块的输出。A distributed optical fiber acoustic wave sensing system based on a remote pump amplifier and a Raman amplifier, the optical fiber acoustic wave sensing system includes: a vibration detection unit, providing signal light; a first laser source, providing a first pump light; a first sensor an optical fiber, the head end of the first sensing fiber receives the combined beam of the first pump light and the signal light; a remote pump amplifier module, the remote pump amplifier module and the tail end of the first sensing fiber The remote pump amplifier includes an erbium-doped fiber for amplifying the signal light in the input; a second sensing fiber, the head end of the second sensing fiber receives the output of the remote pump amplifier module.
优选地,所述光纤声波传感系统包括:第二激光源,提供第二泵浦光,输入所述第二传感光纤。所述第一泵浦光为1480nm,所述第二泵浦光为1455nm。所述远泵放大器包括将所述第一泵浦光和信号光分离的波分复用器、和将分离后的第一泵浦光调节的衰减器、将调节后的第一泵浦光和信号光再次合束的另一波分复用器,再次合束后的第一泵浦光和信号光输入所述掺铒光纤中。Preferably, the optical fiber acoustic wave sensing system includes: a second laser source, which provides a second pump light and is input to the second sensing fiber. The first pump light is 1480 nm, and the second pump light is 1455 nm. The remote pump amplifier includes a wavelength division multiplexer for separating the first pump light and signal light, an attenuator for adjusting the separated first pump light, and the adjusted first pump light and Another wavelength division multiplexer that combines the signal light again, and the first pump light and the signal light after the recombination are input into the erbium-doped fiber.
优选地,所述第一泵浦光为1455nm。所述光纤声波传感系统包括:第三激光源,提供第三泵浦光,用来与所述合束光再次合束后输入所述掺铒光纤。所述第三泵浦光为1480nm。Preferably, the first pump light is 1455 nm. The optical fiber acoustic wave sensing system includes: a third laser source, which provides a third pump light, which is used for recombining with the combining light and then inputting the erbium-doped optical fiber. The third pump light is 1480 nm.
优选地,所述第一传感光纤和远泵放大器模块之间连接有第一环形器,所述第一环形器的第一端与所述第一传感光纤的尾端连接,所述第一环形器的第二端与所述远泵放大器的输入端连接,所述第一环形器还包括第三端,所述第一环形器的第一端的入射光自其第二端导出,所述第一环形器的第三端的入射光自其第一端导出。Preferably, a first circulator is connected between the first sensing fiber and the remote pump amplifier module, the first end of the first circulator is connected to the tail end of the first sensing fiber, and the first circulator is connected to the tail end of the first sensing fiber. The second end of a circulator is connected to the input end of the remote pump amplifier, the first circulator further includes a third end, and the incident light at the first end of the first circulator is derived from the second end thereof, Incident light at the third end of the first circulator is directed away from the first end thereof.
优选地,所述第二传感光纤和远泵放大器模块之间连接有第二环形器,所述第二环形器的第一端与所述远泵放大器的输出端连接,所述第二环形器的第二端与所述第二传感光纤的首端连接,所述第二环形器的第三端与所述第一环形器的第三端连接,所述第二环形器的第一端的入射光自第二端导出,所述第二环形器的第二端的入射光自第三端导出。Preferably, a second circulator is connected between the second sensing fiber and the remote pump amplifier module, the first end of the second circulator is connected to the output end of the remote pump amplifier, and the second ring The second end of the circulator is connected to the head end of the second sensing fiber, the third end of the second circulator is connected to the third end of the first circulator, and the first The incident light of the end is led out from the second end, and the incident light of the second end of the second circulator is led out from the third end.
与现有技术相比,本发明的有益效果为:制约高速率、超长距离通信系统大规模应用的主要因素是光信噪比(Optical Signal Noise Ratio,简写为:OSNR),本方案在提高系统OSNR方面有独特优势,其低噪声系数的特性可显著降低光纤通信系统中光信噪比劣化速度,对延长传输距离、扩大跨段间距、降低系统成本等有重要意义;Compared with the prior art, the beneficial effects of the present invention are as follows: the main factor restricting the large-scale application of high-speed and ultra-long-distance communication systems is the optical signal-to-noise ratio (Optical Signal Noise Ratio, abbreviated as: OSNR). The system OSNR has unique advantages. Its low noise figure can significantly reduce the degradation speed of the optical signal-to-noise ratio in the optical fiber communication system, which is of great significance for extending the transmission distance, expanding the span distance, and reducing the system cost;
远泵放大器模块是一种置于系统线路中的放大器,与接收端和发射端所用的前置放大器和功率放大器有所区别;所谓“远泵”指的是放大器的泵源距离作为增益介质的掺铒光纤有一段比较长的距离,从而可以将泵源置于发射端或接收端。远泵掺铒光纤放大器采用1480nm激光器作为泵源,比采用980nnm泵源具有更高的效率,同时1480nm光在线路中传输比980nnm传输损耗低很多;远泵掺铒光纤放大器可以实现连续输出,具有增益高、噪声系数低,极宽的增益带宽等优良特性;The remote pump amplifier module is an amplifier placed in the system circuit, which is different from the preamplifier and power amplifier used at the receiving end and the transmitting end; the so-called "remote pump" refers to the distance between the pump source of the amplifier as the gain medium. Erbium-doped fiber has a relatively long distance, so that the pump source can be placed at the transmitter or receiver. The far-pump erbium-doped fiber amplifier uses a 1480 nm laser as the pump source, which has higher efficiency than the 980-nm pump source, and the transmission loss of 1480 nm light in the line is much lower than that of 980 nm; the far-pump erbium-doped fiber amplifier can achieve continuous output, with High gain, low noise figure, extremely wide gain bandwidth and other excellent characteristics;
拉曼光纤放大器采用高性能大功率1455nm泵浦激光器实现连续输出,利用传输光纤作为增益介质,利用入射泵浦光与介质分子的能量转移,即受激拉曼散射过程对弱信号光的放大,是一种基于光纤的全波段放大器,也是一种分布式放大器;具有增益高、噪声系数低,极宽的增益带宽等优良特性;The Raman fiber amplifier uses a high-performance high-power 1455nm pump laser to achieve continuous output, uses the transmission fiber as the gain medium, and uses the energy transfer between the incident pump light and the medium molecules, that is, the amplification of weak signal light by the stimulated Raman scattering process. It is a fiber-based full-band amplifier and a distributed amplifier; it has excellent characteristics such as high gain, low noise figure, and extremely wide gain bandwidth;
采用远泵放大器模块和拉曼放大器后,系统的传输距离延长到100km,从而有效地增大系统的传感距离。After using the remote pump amplifier module and Raman amplifier, the transmission distance of the system is extended to 100km, thereby effectively increasing the sensing distance of the system.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.
图1为现有技术中DAS设备的瀑布图。FIG. 1 is a waterfall diagram of a DAS device in the prior art.
图2为实施例一的示意图。FIG. 2 is a schematic diagram of the first embodiment.
图3实施例一的100km原始曲线图。FIG. 3 is a 100km original graph of the first embodiment.
图4为实施例一的100km瀑布图。FIG. 4 is a 100km waterfall diagram of the first embodiment.
图5为实施例一的前50km的瀑布图。FIG. 5 is a waterfall diagram of the first 50km of the first embodiment.
图6为实施例一的后50km的瀑布图。FIG. 6 is a waterfall diagram of the last 50 km of the first embodiment.
图7为实施例二的示意图。FIG. 7 is a schematic diagram of the second embodiment.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有付出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
在本发明的描述中,需要理解的是,术语“纵向”、“横向”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系,仅是为了便于描述本发明和简化描述,而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本发明的限制。In the description of the present invention, it should be understood that the terms "portrait", "horizontal", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientations or positional relationships indicated by "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than An indication or implication that the referred device or element must have a particular orientation, be constructed and operate in a particular orientation, is not to be construed as a limitation of the invention.
实施例一Example 1
如图2-6所示,基于远泵放大器和拉曼放大器的分布式光纤声波传感系统,光纤声波传感系统包括:振动探测单元1,提供信号光;第一激光源2,提供第一泵浦光;第一传感光纤3,第一传感光纤3的首端接收第一泵浦光与信号光的合束光;远泵放大器模块4,远泵放大器模块4与第一传感光纤3的尾端连接,远泵放大器包括用来放大输入中信号光的掺铒光纤5;第二传感光纤6,第二传感光纤6的首端接收远泵放大器模块4的输出。As shown in Figure 2-6, the distributed optical fiber acoustic wave sensing system based on remote pump amplifiers and Raman amplifiers, the optical fiber acoustic wave sensing system includes: a vibration detection unit 1, which provides signal light; a first laser source 2, which provides a first pump light; the first sensing fiber 3, the head end of the first sensing fiber 3 receives the combined beam of the first pump light and the signal light; the remote pump amplifier module 4, the remote pump amplifier module 4 and the first sensor The end of the optical fiber 3 is connected, and the remote pump amplifier includes an erbium-doped fiber 5 for amplifying the signal light in the input; the second sensing fiber 6, the head end of the second sensing fiber 6 receives the output of the remote pump amplifier module 4 .
光纤声波传感系统包括:第二激光源7,提供第二泵浦光,输入第二传感光纤6。The fiber optic acoustic wave sensing system includes: a second laser source 7 , which provides a second pump light and is input to the second sensing fiber 6 .
第一泵浦光为1480nm,第二泵浦光为1455nm。The first pump light is 1480 nm, and the second pump light is 1455 nm.
远泵放大器模块4包括将第一泵浦光和信号光分离的波分复用器8、和将分离后的第一泵浦光调节的衰减器9、将调节后的第一泵浦光和信号光再次合束的另一波分复用器8,再次合束后的第一泵浦光和信号光输入掺铒光纤5中。The far pump amplifier module 4 includes a
第一传感光纤3和远泵放大器模块4之间连接有第一环形器11,第一环形器11的第一端与第一传感光纤3的尾端连接,第一环形器11的第二端与远泵放大器的输入端连接,第一环形器11还包括第三端,第一环形器11的第一端的入射光自其第二端导出,第一环形器11的第三端的入射光自其第一端导出。第一环形器11亦能设置在将第一泵浦光和信号光分离的波分复用器8与将调节后的第一泵浦光和信号光再次合束的另一波分复用器8二者之间。A first circulator 11 is connected between the first sensing fiber 3 and the remote pump amplifier module 4 , the first end of the first circulator 11 is connected with the tail end of the first sensing fiber 3 , and the first circulator 11 is connected to the tail end of the first sensing fiber 3 . The two ends are connected to the input end of the remote pump amplifier. The first circulator 11 further includes a third end. The incident light at the first end of the first circulator 11 is led out from the second end. Incident light exits from its first end. The first circulator 11 can also be arranged in the
第二传感光纤6和远泵放大器模块4之间连接有第二环形器12,第二环形器12的第一端与远泵放大器的输出端连接,第二环形器12的第二端与第二传感光纤6的首端连接,第二环形器12的第三端与第一环形器11的第三端连接,第二环形器12的第一端的入射光自第二端导出,第二环形器12的第二端的入射光自第三端导出。A
系统中的探测光纤长度为100km,由两段50km光纤组成。该系统的工作原理为:在振动探测单元一端的1480nm激光器作为远泵泵源,该泵源输出的光经过隔离器后(该隔离器所起的作用:防止光纤端面的反射光将激光器打坏),与振动探测单元输出的1550nm的信号光同时进入波分复用器1中,然后进入50km探测光纤中。该50km光纤后面的虚线框内的器件和掺铒光纤构成远泵放大器模块。该模块输出的光经过第二环形器后进入到第二段50km探测光纤中。1455nm激光器作为拉曼泵源,接在第二段50km光纤的尾端。The length of the detection fiber in the system is 100km, which consists of two 50km optical fibers. The working principle of the system is: the 1480nm laser at one end of the vibration detection unit is used as a remote pump source, and the light output by the pump source passes through the isolator (the function of the isolator: to prevent the reflected light from the end face of the fiber from damaging the laser ), and the 1550nm signal light output from the vibration detection unit enters the wavelength division multiplexer 1 at the same time, and then enters the 50km detection fiber. The devices in the dotted box behind the 50km fiber and the erbium-doped fiber constitute a far-pump amplifier module. The light output by the module enters the second section of 50km detection fiber after passing through the second circulator. A 1455nm laser is used as a Raman pump source and is connected to the end of the second 50km fiber.
光纤环形器工作在1550nm波段,共有3个端口。环形器的工作原理为:输入到第一环形器端口的光直接到2端口输出,输入到第二环形器端口的光直接到3端口输出。The fiber optic circulator works in the 1550nm band and has 3 ports in total. The working principle of the circulator is as follows: the light input to the port of the first circulator is directly output to port 2, and the light input to the port of the second circulator is directly output to port 3.
第二环形器的工作过程如下:远泵放大器输出的信号光进入第二环形器的1端口后直接进入2端口,然后进入第二段50km光纤。第二段50km探测光纤中产生的自发背向瑞利散射相干光进入第二环形器的2端口后直接到3端口,然后进入远泵放大器模块、第一段50km光纤和波分复用器1,最后进入光纤分布式振动探测单元做信号处理从而检测出光纤沿路的微扰动。The working process of the second circulator is as follows: the signal light output by the remote pump amplifier enters port 1 of the second circulator and directly enters port 2, and then enters the second 50km fiber. The spontaneous back-Rayleigh scattered coherent light generated in the second 50km probe fiber enters port 2 of the second circulator and directly to port 3, and then enters the remote pump amplifier module, the first 50km fiber and wavelength division multiplexer 1 , and finally enter the optical fiber distributed vibration detection unit for signal processing to detect the micro-perturbation along the optical fiber.
1480nm远泵泵源起到两方面的作用,一是作为拉曼泵源,注入到远距离光纤中实现光信号的分布式放大,二是作为泵源,传输到50km光纤后的远泵放大器模块中作为泵源,从而有效地增大系统的传感距离。The 1480nm remote pump source plays two roles, one is as a Raman pump source, injected into a long-distance optical fiber to achieve distributed amplification of optical signals, and the other is as a pump source, a remote pump amplifier module after transmission to a 50km optical fiber It can be used as a pump source, thereby effectively increasing the sensing distance of the system.
可以看出每一段光纤的瀑布图都非常清晰。采用远泵掺铒光纤放大器和拉曼放大器后,系统的传输距离从40km延长到100km,从而有效地增大系统的传感距离。It can be seen that the waterfall diagram of each fiber segment is very clear. After using the far-pump erbium-doped fiber amplifier and Raman amplifier, the transmission distance of the system is extended from 40km to 100km, thereby effectively increasing the sensing distance of the system.
光传感系统与光通信系统不同,随着光脉冲的功率增大,传感系统中很容易引起非线性效应,例如四波混频和受激拉曼效应。光纤越长,受激拉曼的临界光功率越小。如前所述,1480nm远泵泵源起到两方面的作用,在发射端作为拉曼泵源时功率越大则信号的增益越大,但大功率的1480nm激光经第一段50km光纤后进入远泵放大器模块中产生的信号光很大则很容易引起非线性效应。为此本发明设计如图2中的虚线框内所示的远泵放大器模块。该模块的最关键地方是利用两个波分复用器将泵浦光和信号光分开进行传输。其工作原理为:在第一个50km光纤中传输的1480nm泵浦光和信号光进入波分复用器2后1480nm泵浦光和1550nm信号光分开,泵浦光一侧加一个可调光衰减器从而优化进入到掺铒光纤中的泵浦光功率。1550nm信号光进入第一环形器的2端口后直接到3端口。衰减后的泵浦光和信号光同时进入波分复用器3中进行合束,再经过隔离器后进入掺铒光纤中将1550nm信号光放大。如前所述,第二段50km光纤中产生的自发背向瑞利散射相干光经第二环形器的3端口输出后进入第一环形器的1端口后直接到2端口输出。然后再进入波分复用器2,第一段50km光纤和波分复用器1,最后进入光纤分布式振动探测单元做信号处理从而检测出光纤沿路的微扰动。Unlike optical communication systems, optical sensing systems are prone to nonlinear effects such as four-wave mixing and stimulated Raman effects as the power of optical pulses increases. The longer the fiber, the lower the critical optical power for stimulated Raman. As mentioned above, the 1480nm remote pump source plays two roles. When the transmitting end is used as the Raman pump source, the higher the power, the greater the signal gain, but the high-power 1480nm laser enters the first 50km fiber The signal light generated in the remote pump amplifier module is very large and it is easy to cause nonlinear effects. To this end, the present invention designs a remote pump amplifier module as shown in the dashed box in FIG. 2 . The most critical part of this module is to use two wavelength division multiplexers to separate the pump light and the signal light for transmission. Its working principle is: after the 1480nm pump light and signal light transmitted in the first 50km fiber enter the wavelength division multiplexer 2, the 1480nm pump light and 1550nm signal light are separated, and an adjustable optical attenuator is added to the pump light side. Thus, the power of the pump light entering the erbium-doped fiber is optimized. The 1550nm signal light enters port 2 of the first circulator and goes directly to port 3. The attenuated pump light and signal light simultaneously enter the wavelength division multiplexer 3 for beam combining, and then enter the erbium-doped fiber after passing through the isolator to amplify the 1550 nm signal light. As mentioned above, the spontaneous back-Rayleigh scattered coherent light generated in the second section of 50km fiber is output through the 3-port of the second circulator, and then enters the 1-port of the first circulator, and is directly output to the 2-port. Then enter the wavelength division multiplexer 2, the first 50km fiber and the wavelength division multiplexer 1, and finally enter the fiber distributed vibration detection unit for signal processing to detect the micro-perturbation along the fiber.
本发明将远泵掺铒光纤放大器和拉曼光纤放大器从光通信领域应用到传感领域中,可以将光纤声波传感系统的传输距离从40km延长到100km,从而有效地增大系统的传感距离。The invention applies the far-pump erbium-doped fiber amplifier and the Raman fiber amplifier from the field of optical communication to the field of sensing, and can extend the transmission distance of the fiber-optic acoustic wave sensing system from 40km to 100km, thereby effectively increasing the sensing capacity of the system. distance.
实施例二Embodiment 2
如图7所示,基于远泵放大器和拉曼放大器的分布式光纤声波传感系统,光纤声波传感系统包括:振动探测单元1,提供信号光;第一激光源2,提供第一泵浦光;第一传感光纤3,第一传感光纤3的首端接收第一泵浦光与信号光的合束光;远泵放大器模块4,远泵放大器模块4与第一传感光纤3的尾端连接,远泵放大器包括用来放大输入中信号光的掺铒光纤5;第二传感光纤6,第二传感光纤6的首端接收远泵放大器模块4的输出。As shown in FIG. 7 , the distributed optical fiber acoustic wave sensing system based on the remote pump amplifier and Raman amplifier, the optical fiber acoustic wave sensing system includes: a vibration detection unit 1, which provides signal light; a first laser source 2, which provides a first pump light; the first sensing fiber 3, the head end of the first sensing fiber 3 receives the combined beam of the first pump light and the signal light; the remote pump amplifier module 4, the remote pump amplifier module 4 and the first sensing fiber 3 The remote pump amplifier includes an erbium-doped fiber 5 for amplifying the signal light in the input; the second sensing fiber 6, the head end of the second sensing fiber 6 receives the output of the remote pump amplifier module 4.
第一泵浦光为1455nm。The first pump light is 1455 nm.
光纤声波传感系统包括:第三激光源10,提供第三泵浦光,用来与合束光再次合束后输入掺铒光纤5。The optical fiber acoustic wave sensing system includes: a third
第三泵浦光为1480nm。The third pump light is 1480 nm.
第一传感光纤3和远泵放大器模块4之间连接有第一环形器11,第一环形器11的第一端与第一传感光纤3的尾端连接,第一环形器11的第二端与远泵放大器的输入端连接,第一环形器11还包括第三端,第一环形器11的第一端的入射光自其第二端导出,第一环形器11的第三端的入射光自其第一端导出。A first circulator 11 is connected between the first sensing fiber 3 and the remote pump amplifier module 4 , the first end of the first circulator 11 is connected with the tail end of the first sensing fiber 3 , and the first circulator 11 is connected to the tail end of the first sensing fiber 3 . The two ends are connected to the input end of the remote pump amplifier. The first circulator 11 further includes a third end. The incident light at the first end of the first circulator 11 is led out from the second end. Incident light exits from its first end.
第二传感光纤6和远泵放大器模块4之间连接有第二环形器12,第二环形器12的第一端与远泵放大器的输出端连接,第二环形器12的第二端与第二传感光纤6的首端连接,第二环形器12的第三端与第一环形器11的第三端连接,第二环形器12的第一端的入射光自第二端导出,第二环形器12的第二端的入射光自第三端导出。A
尽管上述实施例已对本发明作出具体描述,但是对于本领域的普通技术人员来说,应该理解为可以在不脱离本发明的精神以及范围之内基于本发明公开的内容进行修改或改进,这些修改和改进都在本发明的精神以及范围之内。Although the above embodiments have specifically described the present invention, it should be understood by those skilled in the art that modifications or improvements can be made based on the disclosure of the present invention without departing from the spirit and scope of the present invention. and modifications are within the spirit and scope of the present invention.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202011001965.4A CN112038878B (en) | 2020-09-22 | 2020-09-22 | Distributed fiber optic acoustic wave sensing system based on remote pump amplifier and Raman amplifier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202011001965.4A CN112038878B (en) | 2020-09-22 | 2020-09-22 | Distributed fiber optic acoustic wave sensing system based on remote pump amplifier and Raman amplifier |
Publications (2)
Publication Number | Publication Date |
---|---|
CN112038878A CN112038878A (en) | 2020-12-04 |
CN112038878B true CN112038878B (en) | 2021-09-07 |
Family
ID=73574098
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202011001965.4A Active CN112038878B (en) | 2020-09-22 | 2020-09-22 | Distributed fiber optic acoustic wave sensing system based on remote pump amplifier and Raman amplifier |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN112038878B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112504969B (en) * | 2021-02-03 | 2021-05-14 | 四川大学 | Device and method for pipeline flange weld health detection based on distributed acoustic sensing |
CN114509095B (en) * | 2022-02-22 | 2023-12-12 | 武汉光迅科技股份有限公司 | Sensing system |
CN115290181B (en) * | 2022-10-09 | 2022-12-27 | 之江实验室 | Distributed acoustic wave sensing system based on random laser amplification and scattering enhanced optical fiber |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1167352A (en) * | 1996-04-11 | 1997-12-10 | 株式会社日立制作所 | Optical amplifier, optical amplification method and optical transmission system using optical amplifier |
CN101162158A (en) * | 2007-11-15 | 2008-04-16 | 中国计量学院 | Ultra-remote distributed fiber raman and brillouin photons sensor |
CN101771234A (en) * | 2010-01-26 | 2010-07-07 | 奇瑞汽车股份有限公司 | Nanosecond pulse optical fiber laser and control method thereof |
CN101893476A (en) * | 2010-03-11 | 2010-11-24 | 上海华魏光纤传感技术有限公司 | Long-distance optical fiber vibration sensing system with distributed amplification |
CN103392136A (en) * | 2010-12-02 | 2013-11-13 | Ofs飞泰尔公司 | Dfb fiber laser bend sensor and optical heterodyne microphone |
CN103913186A (en) * | 2014-04-25 | 2014-07-09 | 重庆大学 | Multiparameter distributed type optical fiber sensing system based on Rayleigh scattering and Raman scattering |
CN203758610U (en) * | 2013-12-20 | 2014-08-06 | 上海波汇通信科技有限公司 | Long-distance distributed optical fiber vibration monitoring system |
WO2018017111A1 (en) * | 2016-07-22 | 2018-01-25 | Halliburton Energy Services, Inc | Dra das system |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0614991D0 (en) * | 2006-07-28 | 2006-09-06 | Schlumberger Holdings | Improvements to raman amplification in distributed sensors |
-
2020
- 2020-09-22 CN CN202011001965.4A patent/CN112038878B/en active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1167352A (en) * | 1996-04-11 | 1997-12-10 | 株式会社日立制作所 | Optical amplifier, optical amplification method and optical transmission system using optical amplifier |
CN101162158A (en) * | 2007-11-15 | 2008-04-16 | 中国计量学院 | Ultra-remote distributed fiber raman and brillouin photons sensor |
CN101771234A (en) * | 2010-01-26 | 2010-07-07 | 奇瑞汽车股份有限公司 | Nanosecond pulse optical fiber laser and control method thereof |
CN101893476A (en) * | 2010-03-11 | 2010-11-24 | 上海华魏光纤传感技术有限公司 | Long-distance optical fiber vibration sensing system with distributed amplification |
CN103392136A (en) * | 2010-12-02 | 2013-11-13 | Ofs飞泰尔公司 | Dfb fiber laser bend sensor and optical heterodyne microphone |
CN203758610U (en) * | 2013-12-20 | 2014-08-06 | 上海波汇通信科技有限公司 | Long-distance distributed optical fiber vibration monitoring system |
CN103913186A (en) * | 2014-04-25 | 2014-07-09 | 重庆大学 | Multiparameter distributed type optical fiber sensing system based on Rayleigh scattering and Raman scattering |
WO2018017111A1 (en) * | 2016-07-22 | 2018-01-25 | Halliburton Energy Services, Inc | Dra das system |
Non-Patent Citations (3)
Title |
---|
Field test and fading measurement of a distributed acoustic sensor system over a 50 km-long fiber;Faruk Uyar 等;《Proc. of SPIE Vol. 10654》;20181231;全文 * |
Long-Range (>100km) Distributed Vibration Sensor based on Φ-OTDR Technique with Spread Amplification and Detection of Probe Pulses;David Sanahuja 等;《In Proceedings of the 7th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS 2019)》;20191231;全文 * |
基于超长环形激光器泵浦的94km布里渊分布式传感系统;袁程旭 等;《光谱学与光谱分析》;20140531;全文 * |
Also Published As
Publication number | Publication date |
---|---|
CN112038878A (en) | 2020-12-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10985520B2 (en) | Long-distance fiber optic distributed acoustic sensing amplification system and method thereof | |
CN112038878B (en) | Distributed fiber optic acoustic wave sensing system based on remote pump amplifier and Raman amplifier | |
CN102706437B (en) | Super-long distance phase-sensitive optical time domain reflectometer (Phi-OTDR) system | |
CN103152097B (en) | A kind of adopt Random Laser to amplify polarization and phase sensitive optical time domain reflectometer | |
CN102322810B (en) | Chaotic laser related Brillouin optical time domain analyzer integrated with optical fiber Raman amplifier | |
CN102506912A (en) | Optical fiber distributed disturbance sensor | |
CN110440900A (en) | A kind of optical fiber distributed type acoustic wave sensing system | |
CN106788752B (en) | A kind of relay amplification device and its method for realizing long-distance distributed optical fiber sensing | |
CN103698959A (en) | Remote optical pumped amplifier for distributed optical fiber sensing | |
CN102538844A (en) | Method and system for improving sensing performance of long-distance Brillouin optical time domain analysis system | |
CN105356945A (en) | Heterodyne optical fiber hydrophone system | |
CN114285473B (en) | Bidirectional optical amplification device, system and method | |
WO2013020276A1 (en) | Brillouin optical time domain analyzer of chaotic laser-related integrated optical fiber raman amplifier | |
CN106525279A (en) | Multi-wavelength-light-source-based method for increasing working distance of distributed spontaneous Raman scattering temperature sensing system | |
CN203103754U (en) | Stimulated Raman amplifier for distributed optical fiber vibration sensing system | |
CN202710286U (en) | Time domain reflectometer fused with Raman amplifier | |
CN112345060B (en) | A DAS System Based on Remote Pump Amplifier | |
CN112033447B (en) | Brillouin optical time domain analysis system based on quasi-distributed passive remote pump amplification | |
CN102799044B (en) | Method and device for amplifying signal light of optical time-domain reflectometer of fusion Raman amplifier | |
CN112880865B (en) | Ultra-long-distance high-spatial-resolution Raman fiber dual-parameter sensing system and method | |
CN216524011U (en) | Long-distance Brillouin optical time domain reflectometer monitoring device | |
CN110657878A (en) | A Distributed Optical Fiber Sensing System for Sound Picking Based on Mach-Zehnder Interferometer and φ-OTDR | |
CN105783955A (en) | Sensitivity adjustable distributed fiber sensing system based on high-order Stokes waves | |
CN118936532B (en) | Fiber-optic sensing system based on stimulated Raman amplification to achieve full-range sensitivity balance | |
CN211121599U (en) | Binary channels optic fibre vibration detecting system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant |