CN103439766B - A kind of space division multiplexing method of multi-core fiber - Google Patents

A kind of space division multiplexing method of multi-core fiber Download PDF

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Publication number
CN103439766B
CN103439766B CN201310258990.4A CN201310258990A CN103439766B CN 103439766 B CN103439766 B CN 103439766B CN 201310258990 A CN201310258990 A CN 201310258990A CN 103439766 B CN103439766 B CN 103439766B
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China
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core
fibre core
sensing
bar
fiber
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CN201310258990.4A
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Chinese (zh)
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CN103439766A (en
Inventor
赵志勇
沈平
付松年
唐明
周金龙
朱冬宏
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江苏金迪电子科技有限公司
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Abstract

The space division multiplexing method of the multi-core fiber in a kind of Fibre Optical Sensor of disclosure, fields of measurement, multi-core fiber has the n bar fibre core of more than 2, using the two of which fibre core in n bar fibre core as input, export fibre core, remaining n-2 bar fibre core is sequentially connected with, constitute the n bar link channel of an only one of which input port and a delivery outlet, n bar link channel sensing n group data;While completing distance distributed sensor, realize again the sensing of multiple multidimensional, improve accuracy and precision, more intelligent.

Description

A kind of space division multiplexing method of multi-core fiber
Technical field
The present invention relates to Fibre Optical Sensor, fields of measurement, be particularly used for the space division multiplexing technology of Fibre Optical Sensor, the environment parameters such as temperature, strain, pressure are realized distributed sensing.
Background technology
Multi-core fiber is the optical fiber in single covering with multiple single, the space division multiplexing of multi-core fiber is that light beam is divided into along space multichannel sensing passage in an optical fiber, pass through space division multiplexing, every bit on optical fiber link is all as sensing element, sensing length is up to tens kilometers, the environment parameter along fiber lengths distribution can be measured continuously, it is achieved distributing optical fiber sensing.
Traditional Distributed Optical Fiber Sensing Techniques specifically includes that the distributed sensing technology (POTDR) based on polarization, distributed sensing technology (ROTDR) based on Raman scattering and the distributed sensing technology (BOTDR/A) etc. based on Brillouin scattering, including: polarization-optical time domain reflectometry (PolarizationOpticalTimeDomainReflectometry), Raman light domain reflectometer (RamanOpticalTimeDomainReflectometry) and Brillouin light domain reflectometer/analyser (BrillouinOpticalTimeDomainReflectometry/Analysis) etc..Wherein, POTDR technology is to reach the purpose of distributed sensing by the change of polarization state in detection fiber.When the external environment residing for optical fiber changes, the local indexes of refraction of optical fiber being distributed and form modulation, cause that the polarization state of Rayleigh scattering light changes, the delay of change and optical signal by detecting polarization state just can realize the sensing of environment to external world.ROTDR is based on the distributed sensing that the inelastic collision Raman scattering effect in optical fiber realizes, Raman scattering can be drifted about by occurrence frequency, wherein can vary with temperature relative to the anti-Stokes Raman scattering light moved on incident illumination occurrence frequency and significant change occurs, but the stokes light that occurrence frequency moves down then is affected very micro-by variations in temperature, as long as so detecting their light intensity, utilize formula can realize the monitoring to temperature.BOTDR/A is based on the distributed sensing that the inelastic collision Brillouin scattering effect in optical fiber realizes, conventional technology includes the BOTDR technology based on spontaneous brillouin scattering and the BOTDA technology based on stimulated Brillouin scattering, Brillouin scattering in optical fiber has a frequency displacement relative to pump light, it is called Brillouin shift, when the variations in temperature of optical fiber local environment or when being stressed effect, Brillouin shift amount and the change of Brillouin scattering light energy can be caused, so can be obtained by, by the frequency displacement and Strength Changes measuring Brillouin scattering, temperature and the strain that sensor fibre is experienced.
Several traditional distributed sensing technology all obtain heat transfer agent by process back-scattering light above, have the disadvantage that
1, in long-distance sensing, backscattering optical attenuation can become very serious, is even submerged in noise, greatly limits distance sensing, and easily produce error, cause precise decreasing, and system reliability reduces.In order to improve the signal to noise ratio of system, it is possible to increase pulse width, improve launched power with this, but be to increase pulse width and can cause the reduction of spatial resolution.In addition to reduce owing to signal to noise ratio deteriorates the generation of the erroneous judgement event caused, the measure usually taked is repetitive measurement, picks out error, improve accuracy, but this is with the time of sacrificing for cost, and some physical quantity is transient, and this is also very big one and denounces.
2, all realize in single-core fiber, utilize the optical fiber with single core, certain event all be can only obtain one group of sensing data within the same time, in long-distance sensing, it is subject to effect of noise, owing to single heat transfer agent amount is not enough, erroneous judgement may be caused, repetitive measurement is then likely to be due to midway delay to be caused missing the seizure to ambient parameter change, and precision is low, poor reliability.
Summary of the invention
The invention aims to solve above-mentioned traditional distributed optical fiber sensing technology Problems existing and a kind of space division multiplexing method based on multi-core fiber is provided, multiple sensor and multidimensional sensing is also realized while measurement environment parameter realizes long-distance distributed sensing treating, make multi-core fiber to the sensing more three-dimensional of environment, more precision, make the distributed sensor constructed by space division multiplexing method that the employing present invention proposes relatively reliable and intelligent.
The technical solution used in the present invention is: multi-core fiber has the n bar fibre core of more than 2, using the two of which fibre core in n bar fibre core as input, export fibre core, remaining n-2 bar fibre core is sequentially connected with, constitute the n bar link channel of an only one of which input port and a delivery outlet, n bar link channel sensing n group data.
After the present invention adopts technique scheme, contrast with prior art, have the advantage that
1, adopting the space division multiplexing method of multi-core fiber of the present invention, be in identical environment from each core macroscopic perspective, each core is as independent sensing passage, similar to the effect of repetitive measurement, it is achieved that multiple sensor, improves accuracy.From microcosmic angle, when each core is as an independent passage, their locus is again different, the perception degree of environment is also different by they, conveniently judge the space distribution information that external physical quantity changes, so having widened sensing dimension, while completing distance distributed sensor, achieve again the sensing of multidimensional.
2, adopting the space division multiplexing method of multi-core fiber of the present invention, link channel can obtain organizing sensing data more, improves accuracy and the precision of measurement.Each core is likely to be different for the response of surrounding environment change simultaneously, the comprehensive heat transfer agent analyzing link channel, it is possible to accomplish the Multidimensional Awareness of localized region, conveniently analyzes the space distribution information of physics variable quantity, more intelligent.
3, the distributed sensor being built into by the space division multiplexing method of multi-core fiber of the present invention, it is possible to as required, reasonably selects the Distributed Optical Fiber Sensing Techniques that POTDR, ROTDR or BOTDR/A etc. are traditional, as required, optimizes design, builds sensor-based system.LASER Light Source is reasonably set, incident illumination is modulated, spectrogrph or photodetector or light polarization analyser is utilized to measure heat transfer agent, calculate the heat transfer agent such as temperature, stress, comprehensively analyze the heat transfer agent obtained, carry out multiple judgement, kick out of false positive event, gained heat transfer agent is carried out multidimensional reproduction, it is achieved the Multidimensional Awareness to environment.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the structural representation of multi-core fiber of the present invention;
Fig. 2 is the schematic diagram of the space division multiplexing method of multi-core fiber of the present invention;
Fig. 3 is the structural representation of a kind of distributed sensor adopting the space division multiplexing method of multi-core fiber of the present invention to be built into.
In figure: 1. multi-core fiber;2. LASER Light Source;3. circulator;4. spectrogrph or photodetector or light polarization analyser;11,12,13,14,15,16,17,21,22,23,24,25,26,27. fibre core port.
Detailed description of the invention
Multi-core fiber 1 shown in Figure 1, multi-core fiber 1 is the carrier realizing sensing, it is possible to be the optical fiber accommodating more than 2 fibre cores in single covering, such as optical fiber such as twin-core fiber, three core fibres, four-core fibers.In order to become apparent from and be fully described by the feature of the present invention, seven core fibres of seven singles that Fig. 1 is distributed only with centrosymmetry are example.One end of seven core fibres has 7 fibre core ports, it is fibre core port 11,12,13,14,15,16,17 respectively, correspondingly, the other end of the multi-core fiber 1 of these seven singles has 7 fibre core ports 11,12,13,14,15,16,17 difference 7 the fibre core ports 21,22,23,24,25,26,27 one to one with one end.
Assume the n bar fibre core accommodated in the single covering of multi-core fiber 1 more than 2, the present invention is using the two of which fibre core in n bar fibre core as inputting, exporting fibre core, remaining n-2 bar fibre core is sequentially connected with, constitute the n bar link channel of an only one of which input port and a delivery outlet, n bar link channel unidirectional sensing n group data, described n bar link channel is to pass sequentially through every fibre core from an input port to a delivery outlet to sense.Every single senses one group of data independently, has several singles just can sense several groups of data.
Such as Fig. 2, for seven core fibres, implementing of all the other multi-core fibers is identical with the embodiment of seven core fibres.Multi-core fiber 1 one end fibre core port except input port is sequentially connected with, multi-core fiber 1 other end fibre core port except output port is sequentially connected with, multi-core fiber 1 is constituted the path of an only one of which input port and a delivery outlet, allowing a road detectable signal carry out transmission back at multi-core fiber 1 go-and-retum, this detectable signal passes sequentially through each core.Such as using one end fibre core port 11 of seven core fibres as input port, other end fibre core port 27 is as delivery outlet, and sensory path is: fibre core port 11 → 21 → 22 → 12 → 13 → 23 → 24 → 14 → 15 → 25 → 26 → 16 → 17 → 27.Although, the repeatedly detection of certain point on optical fiber link is deposited at certain time intervals, but owing to light spread speed in a vacuum is about, also have during transmission in a fiberMagnitude, so this interval is very short, multiple, multidimensional sensing can be realized, event evolution-information in time can also be obtained by analyzing each sensing data.
The application examples of the present invention presented below:
As it is shown on figure 3, form a kind of distributed sensor together with LASER Light Source 2 other device such as grade with the multi-core fiber 1 shown in Fig. 1, this distributed sensor can also include circulator 3 and spectrogrph or photodetector or light polarization analyser 4 etc..This distributed sensor can adopt the technology that POTDR, ROTDR, BOTDR/A etc. are different.The light sent by LASER Light Source 2 is coupled in multi-core fiber 1 through circulator 3, then, according to the space division multiplexing method adopting multi-core fiber 1 of the present invention, the transducing signal (scattering light or detection light) obtained from multi-core fiber 1 enters photodetector or light polarization analyser 4 through circulator 3, spectrogrph therein can measure frequency displacement, photodetector can measure optical power change, light polarization analyser can measure the polarization state of light, choice of technology one or more of which instrument according to adopting is detected, and thus can obtain measurement data.

Claims (1)

1. the space division multiplexing method of a multi-core fiber, described multi-core fiber has the n bar fibre core of more than 2, it is characterized in that: using the two of which fibre core in n bar fibre core as input, export fibre core, remaining n-2 bar fibre core is sequentially connected with, constitute the n bar link channel of an only one of which input port and a delivery outlet, n bar link channel sensing n group data;Described n bar link channel passes sequentially through every fibre core unidirectional sensing n group data from one input port to one delivery outlet, and a road detectable signal carrys out transmission back at the go-and-retum of multi-core fiber, and described detectable signal passes sequentially through each fibre core.
CN201310258990.4A 2013-06-26 2013-06-26 A kind of space division multiplexing method of multi-core fiber CN103439766B (en)

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US10302463B2 (en) * 2015-11-19 2019-05-28 Corning Incorporated Distributed fiber sensors and systems employing multicore optical fibers
US10145681B2 (en) 2016-07-19 2018-12-04 Corning Incorporated Brillouin-based distributed bend fiber sensor and method for using same
CN110113104A (en) * 2018-02-01 2019-08-09 桂林电子科技大学 A kind of method and device generating adjustable microwave signal based on single-mode dual-core optical fiber
CN110243305B (en) * 2018-03-08 2020-11-06 桂林电子科技大学 Multi-core circulating tandem type optical fiber shape sensor based on dynamic BOTDA
CN110243302B (en) * 2018-03-08 2020-11-06 桂林电子科技大学 Reflection type multi-core circulating series connection optical fiber shape sensor
CN110132397B (en) * 2019-05-09 2021-03-19 南京大学 Method for reducing dead zone probability in phi-OTDR system based on space division multiplexing
CN110166117B (en) * 2019-05-17 2021-04-16 华南师范大学 Fault monitoring system and method for long-distance double-path optical fiber unidirectional transmission
CN110166135A (en) * 2019-05-17 2019-08-23 华南师范大学 A kind of fault monitoring system and method for long range multi-core optical fiber one-way transmission
CN110247705B (en) * 2019-06-21 2020-12-08 武汉邮电科学研究院有限公司 Multi-core fiber-based optical quantum fusion network implementation method and system
CN110595599A (en) * 2019-08-15 2019-12-20 广东电网有限责任公司 Method for reducing polarization fading of optical fiber vibration system and detection system applying same

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