CN103439766A - Spatial division multiplexing method for multi-core optical fiber - Google Patents
Spatial division multiplexing method for multi-core optical fiber Download PDFInfo
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Abstract
The invention discloses a spatial division multiplexing method for a multi-core optical fiber in the field of optical fiber sensing and measuring. The multi-core optical fiber is provided with n fiber cores, wherein n is larger than 2. Two of the n fiber cores are used as an input fiber core and an output fiber core respectively, the other n-2 fiber cores are sequentially connected, and therefore n link channels with one input port and one output port are formed, and the n link channels sense n sets of data. According to the spatial division multiplexing method for the multi-core optical fiber, long-distance sensing distribution is finished, multiple and multidimensional sensing is achieved at the same time, accuracy is improved, and intelligence is achieved.
Description
Technical field
The present invention relates to Fibre Optical Sensor, fields of measurement, specifically, for the space division multiplexing technology of Fibre Optical Sensor, the environment parameters such as temperature, strain, pressure are realized to distributed sensing.
Background technology
Multi-core fiber is to have the optical fiber of a plurality of single cores in single covering, the space division multiplexing of multi-core fiber is light beam to be divided into to the multichannel sensing passage in an optical fiber along space, by space division multiplexing, every bit on optical fiber link is all as sensing element, sensing length can reach tens kilometers, the environment parameter can continuous coverage distributed along fiber lengths, realize distributing optical fiber sensing.
Traditional Distributed Optical Fiber Sensing Techniques mainly comprises: the distributed sensing technology (POTDR) based on polarization, distributed sensing technology (ROTDR) based on Raman scattering and the distributed sensing technology (BOTDR/A) based on Brillouin scattering etc., comprise: polarization-optical time domain reflectometry (Polarization Optical Time Domain Reflectometry), Raman light domain reflectometer (Raman Optical Time Domain Reflectometry) and Brillouin light domain reflectometer/analyser (Brillouin Optical Time Domain Reflectometry/Analysis) etc.Wherein, the POTDR technology is to reach the purpose of distributed sensing by the variation of polarization state in detection fiber.When the residing external environment of optical fiber changes, can distribute and form modulation the local indexes of refraction of optical fiber, cause the polarization state of Rayleigh scattering light to change, just can realize the sensing of environment to external world by the variation of detection polarization state and the delay of light signal.ROTDR is based on the distributed sensing that the inelastic collision Raman scattering effect in optical fiber is realized, the drift of Raman scattering meeting occurrence frequency, wherein with respect to the anti-Stokes Raman diffused light moved on the incident light occurrence frequency, can vary with temperature and significant variation occurs, but the stokes light that occurrence frequency moves down is subject to influence of temperature change very micro-, as long as, so detect 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, technology commonly used comprises 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 with respect to pump light, be called Brillouin shift, when the temperature variation of optical fiber environment of living in or while being subject to effect of stress, can cause the variation of Brillouin shift amount and Brillouin scattering luminous energy, so just can obtain by frequency displacement and the Strength Changes of measuring Brillouin scattering temperature and the strain that sensor fibre is experienced.
Above several traditional distributed sensing technology all obtains heat transfer agent by processing back-scattering light, has the following disadvantages:
1, in long-distance sensing, it is very serious that the backscattering optical attenuation can become, and even is submerged in noise, limited greatly distance sensing, and easily produced error, causes precise decreasing, and system reliability reduces.In order to improve the signal to noise ratio (S/N ratio) of system, can increase pulse width, improve launched power with this, but increase the reduction that pulse width can cause spatial resolution.In order to reduce the generation of the erroneous judgement event caused because signal to noise ratio (S/N ratio) is deteriorated, the measure of usually taking is repeatedly to measure, and picks out error in addition, improve accuracy, but this take the sacrifice time as cost, and some physical quantity is transient, and this is also very large one and denounces.
2, all in single-core fiber, realize, utilization has the optical fiber of single core, all can only obtain one group of sensing data to certain event at one time, in long-distance sensing, be subject to the impact of noise, due to single heat transfer agent quantity not sufficient, may cause erroneous judgement, repeatedly measure and may cause missing the seizure that environmental parameter is changed owing to incuring loss through delay midway, precision be low, poor reliability.
Summary of the invention
The objective of the invention is the problem in order to solve above-mentioned traditional distributed optical fiber sensing technology existence and a kind of space division multiplexing method based on multi-core fiber is provided, also realize multiple sensing and multidimensional sensing treating when the measurement environment parameter is realized long-distance distributed sensing, make multi-core fiber to the sensing of environment more three-dimensional, precision more, the constructed distributed sensor of the space division multiplexing method that makes to adopt the present invention to propose is more reliable and intelligent.
The technical solution used in the present invention is: multi-core fiber has the n bar fibre core more than 2, using wherein two fibre cores in n bar fibre core respectively as input, output fibre core, remaining n-2 bar fibre core is connected successively, form a n bar link channel of only having an input port and a delivery outlet, n bar link channel sensing n organizes data.
After the present invention adopts technique scheme, with the prior art contrast, have the following advantages:
1, adopt the space division multiplexing method of multi-core fiber of the present invention, from macroscopic perspective, each core is in identical environment, and each core is as sensing passage independently, similar to the effect of repeatedly measuring, and has realized multiple sensing, has improved accuracy.From microcosmic angle, each core is as one independently during passage, their locus is again different, they are also different to the perception degree of environment, the space distribution information that convenient judgement external physical quantity changes, so widened the sensing dimension, realized again the sensing of multidimensional when having completed long range distribution sensing.
2, adopt the space division multiplexing method of multi-core fiber of the present invention, link channel can obtain many group sensing datas, has improved accuracy and the precision measured.Simultaneously each core is likely different for the response of surrounding environment change, and the heat transfer agent of analysis-by-synthesis link channel can be accomplished the Multidimensional Awareness of localized region, and the convenient space distribution information of analyzing the physics variable quantity is more intelligent.
3, the distributed sensor be built into by the space division multiplexing method of multi-core fiber of the present invention, can as required, reasonably select traditional Distributed Optical Fiber Sensing Techniques such as POTDR, ROTDR or BOTDR/A, as required, optimal design, build sensor-based system.LASER Light Source reasonably is set, incident light is modulated, utilize spectrometer or photodetector or light polarization analyser to measure heat transfer agent, calculate the heat transfer agents such as temperature, stress, the heat transfer agent that analysis-by-synthesis obtains, carry out multiple judgement, kicks out of the wrong report event, the gained heat transfer agent is carried out to the multidimensional reproduction, realize the Multidimensional Awareness to environment.
The 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 of 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. spectrometer or photodetector or light polarization analyser; 11,12,13,14,15,16,17,21,22,23,24,25,26,27. fibre core ports.
Embodiment
Suppose in the single covering of multi-core fiber 1 to accommodate the n bar fibre core that is greater than 2, the present invention using wherein two fibre cores in n bar fibre core respectively as input, output fibre core, remaining n-2 bar fibre core is connected successively, form a n bar link channel of only having an input port and a delivery outlet, the unidirectional sensing n group of n bar link channel data, described n bar link channel is successively by every fibre core sensing from input port to a delivery outlet.Every single core is one group of data of sensing independently, has several single cores just can several groups of data of sensing.
As Fig. 2, take seven core fibres as example, the enforcement of all the other multi-core fibers is identical with the embodiment of seven core fibres.Fibre core port by multi-core fiber 1 one ends except input port connects successively, the fibre core port of multi-core fiber 1 other end except output port connects successively, multi-core fiber 1 is formed to a path that only has an input port and a delivery outlet, allow a road detectable signal carry out transmission back between multi-core fiber 1 two ends, this detectable signal is successively by each core.For example, using an end fibre core port one 1 of seven core fibres as input port, other end fibre core port 27 is as delivery outlet, and the sensing path is: fibre core port one 1 → 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 existed to the certain hour interval, because light velocity of propagation in a vacuum is about
, while transmitting in optical fiber, also have
magnitude, so this time interval is very short, can realize multiple, multidimensional sensing, can also obtain event evolution-information in time by analyzing each sensing data.
application examples of the present invention below is provided:
As shown in Figure 3, with the multi-core fiber 1 shown in Fig. 1, together with LASER Light Source 2 other devices such as grade, form a kind of distributed sensor, this distributed sensor can also comprise circulator 3 and spectrometer or photodetector or light polarization analyser 4 etc.This distributed sensor can adopt the different technology such as POTDR, ROTDR, BOTDR/A.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 that adopts multi-core fiber 1 of the present invention, the transducing signal obtained from multi-core fiber 1 (scattered light or detection light) enters photodetector or light polarization analyser 4 through circulator 3, spectrometer wherein can be measured frequency displacement, photodetector can be measured optical power change, the light polarization analyser can be measured the polarisation of light state, according to the adopted choice of technology wherein one or more instruments surveyed, can obtain measurement data thus.
Claims (3)
1. the space division multiplexing method of a multi-core fiber, described multi-core fiber has the n bar fibre core more than 2, it is characterized in that: using wherein two fibre cores in n bar fibre core respectively as input, output fibre core, remaining n-2 bar fibre core is connected successively, form a n bar link channel of only having an input port and a delivery outlet, n bar link channel sensing n organizes data.
2. the space division multiplexing method of a kind of multi-core fiber according to claim 1 is characterized in that: described n bar link channel is organized data by every unidirectional sensing n of fibre core successively from a described input port to a described delivery outlet.
3. the space division multiplexing method of a kind of multi-core fiber according to claim 2, it is characterized in that: a road detectable signal carrys out transmission back between the two ends of multi-core fiber.
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| WO2018017403A1 (en) * | 2016-07-19 | 2018-01-25 | Corning Incorporated | Brillouin-based distributed bend fiber sensor and method for using same |
| CN108292009A (en) * | 2015-11-19 | 2018-07-17 | 康宁股份有限公司 | Using the distributed fiberoptic sensor and system of multicore fiber |
| 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 |
| CN110132397A (en) * | 2019-05-09 | 2019-08-16 | 南京大学 | A method of reducing dead zone probability in the Φ-OTDR system based on space division multiplexing |
| 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 |
| CN110166117A (en) * | 2019-05-17 | 2019-08-23 | 华南师范大学 | A kind of fault monitoring system and method for long range two-way optical one-way transmission |
| CN110247705A (en) * | 2019-06-21 | 2019-09-17 | 武汉邮电科学研究院有限公司 | A kind of light quantum converged network realization method and system based on multi-core optical fiber |
| CN110243305A (en) * | 2018-03-08 | 2019-09-17 | 桂林电子科技大学 | Multicore based on dynamic BOTDA recycles concatenation type optical fiber shape sensor |
| CN110243302A (en) * | 2018-03-08 | 2019-09-17 | 桂林电子科技大学 | Reflective multicore recycles concatenated fiber shape sensor |
| 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 |
| CN111442789A (en) * | 2020-04-03 | 2020-07-24 | 南京晓庄学院 | Method for improving spatial resolution and measurement accuracy of sensing system based on mode multiplexing |
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| CN105305210B (en) * | 2015-11-18 | 2018-04-13 | 中国工程物理研究院激光聚变研究中心 | A kind of high-power all-fiber laser based on multi-core optical fiber |
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| 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 |
| CN110113104B (en) * | 2018-02-01 | 2021-07-02 | 桂林电子科技大学 | Device for generating adjustable microwave signal based on single-mode double-core optical fiber |
| CN110243305A (en) * | 2018-03-08 | 2019-09-17 | 桂林电子科技大学 | Multicore based on dynamic BOTDA recycles concatenation type optical fiber shape sensor |
| CN110243302A (en) * | 2018-03-08 | 2019-09-17 | 桂林电子科技大学 | Reflective multicore recycles concatenated fiber shape sensor |
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| CN110166117A (en) * | 2019-05-17 | 2019-08-23 | 华南师范大学 | A kind of fault monitoring system and method for long range two-way optical one-way transmission |
| 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 |
| CN110247705A (en) * | 2019-06-21 | 2019-09-17 | 武汉邮电科学研究院有限公司 | A kind of light quantum converged network realization method and system based on multi-core optical fiber |
| 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 |
| CN111442789A (en) * | 2020-04-03 | 2020-07-24 | 南京晓庄学院 | Method for improving spatial resolution and measurement accuracy of sensing system based on mode multiplexing |
| CN111442789B (en) * | 2020-04-03 | 2022-03-29 | 南京晓庄学院 | Method for improving spatial resolution and measurement accuracy of sensing system based on mode multiplexing |
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