CN103731211A - Dispersion compensation method suitable for fewer-mode type multiplexing system - Google Patents
Dispersion compensation method suitable for fewer-mode type multiplexing system Download PDFInfo
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- CN103731211A CN103731211A CN201310358861.2A CN201310358861A CN103731211A CN 103731211 A CN103731211 A CN 103731211A CN 201310358861 A CN201310358861 A CN 201310358861A CN 103731211 A CN103731211 A CN 103731211A
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Abstract
The invention relates to a dispersion compensation method suitable for a fewer-mode type multiplexing system. Through gradual-changing fewer-mode optical fibers with special design and a segmental cascading structure, dispersion compensation between transmission modes is achieved. Two fewer-mode optical fiber sections have the same basic transmission mode in a C-wave band, and have opposite dispersions and dispersion slopes. The length ratio of two fewer-mode optical fiber cross-segments is selected to achieve dispersion compensation between modes. By means of the method, inter-model dispersion compensation accumulated at nodes or route terminals of a fewer-mode type multiplexing system through transmission can be effectively compensated, practicability and flexibility are high, and the method is efficiently suitable for a mode-dividing multiplexing system and system terminal signal processing.
Description
Technical field
The present invention relates to a kind of dispersion compensation method that is applicable to few mould mode multiplexing system, relate in particular to a kind of inter-modal dispersion compensation method based on gradation type less fundamental mode optical fibre.
Technical background
For solving in high-speed optical transmission system transmission capacity by the bottleneck facing, utilize multi-core fiber and the multimode fiber by new design as emerging scheme, to become gradually the study hotspot of each scientific research institution as the mode multiplexing technology of different transmission mode in less fundamental mode optical fibre.Mode multiplexing technology is a kind of based on fibre-optic waveguide transmission mode, adopts and except basic transmission mode, also comprises that more higher order mode is as carrier wave, carries out mould and divides multiplexingly, realizes more high power capacity, the more novel optical communication technique of high transfer rate.
But then, few mould mode multiplexing optical transmission system is to utilize light transmission different mode signal transmission in less fundamental mode optical fibre, the manufacture craft that optical transmission mode is inevitably subject to actual fiber in practical communication system is as mechanical pressure, distortion, having a strong impact on of the factors such as micro-curved and fiber span mismatch, cause the orthogonality between transmission mode to be damaged, basic mode distributes different from higher order mode concentration of energy in fibre core simultaneously, further cause the group rate difference of different mode, produce intermode group delay dispersion, at transmission terminal light signal, will be subject to severe jamming.
In the mode multiplexing optical transmission system of present stage research, be mostly carry out the inter-modal dispersion of balanced and compensation transmission accumulation or adopt the balanced dispersion in optical channel of many step change types less fundamental mode optical fibre in terminal by multiple-input and multiple-output Digital Signal Processing.Although these technology can reduce inter-modal dispersion value to a certain extent, be all correspondingly subject to actual environment, decoding complex degree, the restriction of the factors such as operating difficulties.
Summary of the invention
For overcoming having a strong impact on that in few mould mode multiplexing system, between different mode, the interference of transmission group speed difference produces communication performance, the invention provides a kind of inter-modal dispersion compensation method based on gradation type less fundamental mode optical fibre.
The optical transmission system example based on less fundamental mode optical fibre that the present invention also provides a kind of above-mentioned inter-modal dispersion compensation method to adopt.
The present invention also provides accumulated chromatic dispersion collocation structure one employing in a kind of above-mentioned less fundamental mode optical fibre transmission line to have positive negative dispersion less fundamental mode optical fibre to intersect the structure of cascade.
The technical scheme of technical solution problem of the present invention is: a kind of method inter-modal dispersion of accumulating in mode multiplexing system transmission link being compensated based on gradation type less fundamental mode optical fibre is provided.The less fundamental mode optical fibre section that the method has positive negative dispersion by intersection cascade realizes inter-modal dispersion compensation.
The optical transmission system example based on less fundamental mode optical fibre that the present invention also provides a kind of above-mentioned inter-modal dispersion compensation method to adopt.Comprise optical transmitter module, Optical Receivers and one section of above-mentioned optical transmission line section, this light emission module comprises signal generating module, mode excitation, pattern conversion and mode multiplexing; Optical Receivers comprises signal receiving module, pattern filtering, pattern conversion and pattern demultiplexing.The inter-modal dispersion compensation of transmission link accumulation can be realized in described optical transmission line section at optical transmission terminal.
Compared with prior art, the inter-modal dispersion compensation method in the mode multiplexing system based on less fundamental mode optical fibre of the present invention, does not need the Digital Signal Processing of terminal complexity, without the basic transmission structure that changes mode multiplexing system.
Accompanying drawing explanation
Fig. 1 is the optical transmission system example based on less fundamental mode optical fibre of the present invention.
Fig. 2 is the refraction index profile schematic diagram of less fundamental mode optical fibre of the present invention
Embodiment
Referring to Fig. 1, is the optical transmission system example based on less fundamental mode optical fibre of the present invention.This mould point multiplexed optical transmission system comprises light emission module, Optical Receivers and one section of optical transmission line section.Optical sender has comprised signal generating module, mode excitation module, pattern modular converter, mode multiplexing module; Optical receiver comprises signal receiving modes, pattern modular converter, pattern demultiplexing module; Transmit optical fiber cable section used and formed by the less fundamental mode optical fibre segmentation intersection cascade with positive negative dispersion, Optical Fiber Transmission is comprised except fundamental mode to other higher order modes carry out the real-Time Compensation of inter-modal dispersion.
Referring to Fig. 2, is the refraction index profile schematic diagram of the less fundamental mode optical fibre that adopts of the present invention.Design adopts the SiO that mixes 90%
2less fundamental mode optical fibre, and the fiber core radius r of Rational choice less fundamental mode optical fibre
0, cladding radius r, utilizes smooth sea to lead the relative index of refraction Δ=(n between the lower fibre core of restriction and covering
1-n
2)/n
1minimum condition, the profile exponent α that chooses positive dispersion fiber is 2.1, the exponent of refractive index α with negative dispersion optical fiber is 1.8.Adopt transmission-line structure of the present invention, positive negative dispersion optical fiber is 1:1.2 across the lenth ratio of section.The total distance of transmission system reaches 100km, within the scope of can be controlled in-6ps/nm/km～5ps/nm/km of total dispersion value.
At least two optical signal transmitters of described photosystem envelope, are intended to produce the light signal in predetermined spectral band-C-band.A transmitter produces the signal sending and propagates with fundamental mode LP01, and another transmitter produces the signal sending and needs, through a pattern modular converter, to be converted to such as LP11 of higher order mode after propagating with fundamental mode LP01.Pattern modular converter can be used for example long-period gratings of any prior art or spatial light modulator to obtain.Obtaining two kinds of patterns propagates along optical transmission line section through mode multiplexing module alignment less fundamental mode optical fibre.As former definition, transmission line section comprises that at least one section of optical fiber with positive dispersion and positive dispersion slope and one section have the optical fiber of negative dispersion and negative dispersion slope.The transmission node of photosystem can comprise image intensifer.At optical receiver Nodes, light signal must have the transmission accumulated chromatic dispersion that approaches zero.Output signal is decoded respectively and is obtained the two paths of signals of the multiplexing fundamental mode LP01 of two-way and for example LP11 of higher order mode through pattern demultiplexing, pattern conversion, pattern filtering, signal processing module successively again.
The long distance, transmit envelope that dispersion compensation method of the present invention is intended to have multiple transmission line sections for few mould mould division multiplexing system is except basic transmission mode more in the inter-modal dispersion module in the transmission system of the bit rate of the multiple transmission mode of higher order mode.
Claims (7)
1. the dispersion compensation method of a few mould modular system, the structure of many fiber span cascade is provided, at least comprises that a gradation type less fundamental mode optical fibre section with positive dispersion and positive dispersion slope and one have the gradation type less fundamental mode optical fibre section of negative dispersion and negative dispersion slope.
2. dispersion compensation method as claimed in claim 1, is characterized in that: the cascade of described two kinds of fiber segments intersection.
3. the optical transmission system based on above-mentioned less fundamental mode optical fibre, comprises light emission module and Optical Receivers, at least one section of transmission line section as described in claim 1 and 2.
4. as claimed in claim 3, the transmitter module of optical transmission system, is characterized in that: comprise at least two signal generating module, mode excitation module, pattern modular converter and mode multiplexing module, two signal generating module are connected with mode excitation module, excite basic transmission mode LP simultaneously
01, wherein a road is connected with pattern modular converter, by basic transmission mode LP
01be converted to higher order mode, for example LP
11; The carrying communication mode of two paths of signals comprises after basic transmission mode and higher order mode access module Multiplexing module simultaneously, and two paths of signals is carried out multiplexing.
5. as claimed in claim 3, the Optical Receivers of optical transmission system, is characterized in that: comprise at least two signal receiving modules, pattern demultiplexing module, pattern modular converter, pattern filtering module and signal processing module; The signal that light emission module transmits is after above-mentioned transmission line section, through pattern demultiplexing module, obtain the light signal that two-way comprises fundamental mode and fine mode, wherein higher order mode is converted to fundamental mode through pattern modular converter again, and further pass through pattern filtering module, filtering higher order mode, makes conversion obtain basic transmission mode more pure; Such two paths of signals is carrying out information decoding through terminal signaling processing module.
6. an inter-modal dispersion compensation method for few mould mode multiplexing system, is characterized in that comprising following steps:
Light emission module is provided, produces at least two kinds of transmission modes that comprise that are suitable for the transmission line section as described in claim 1 and 2;
Optical Receivers is provided, receives two kinds of arq modes after inter-modal dispersion compensation;
Light emission module produces and comprises after at least two kinds of transmission modes, requires described transmission line section to be connected with claim 1 and 2, after certain transmission line length, is connected with Optical Receivers.
7. the inter-modal dispersion compensation method of few mould mode multiplexing photosystem as claimed in claim 6, is characterized in that: the dispersion in compensating light transmission system between basic transmission mode and higher order mode.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103997386A (en) * | 2014-06-03 | 2014-08-20 | 北京邮电大学 | Method for accurately converting arbitrary modes based on simulated annealing algorithm |
| CN106716874A (en) * | 2014-09-30 | 2017-05-24 | 阿尔卡特朗讯 | A method for producing a quality of transmission estimator for optical transmissions |
| CN106253973B (en) * | 2016-07-25 | 2018-09-18 | 暨南大学 | A kind of long range less fundamental mode optical fibre characteristic measurement method and device |
| CN111948664A (en) * | 2020-08-18 | 2020-11-17 | 中国科学院光电技术研究所 | Dispersion compensation method of frequency modulation continuous wave laser radar based on dispersion coefficient modulation |
| WO2021129870A1 (en) * | 2019-12-28 | 2021-07-01 | 华为技术有限公司 | Transmission cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294690A (en) * | 1999-02-22 | 2001-05-09 | 古河电气工业株式会社 | Optical transmission line, negtive dispersion optical fiber used for optical transmission line, and optical transmission system comprising optical transmission line |
| US20130064554A1 (en) * | 2010-01-27 | 2013-03-14 | University Of Central Florida Research Foundation Inc. | Optical Transmission Using Few-Mode Fibers |
| CN103152099A (en) * | 2013-01-31 | 2013-06-12 | 华中科技大学 | Single-fiber bidirectional transmission system based on mode division multiplexing |
-
2013
- 2013-08-16 CN CN201310358861.2A patent/CN103731211A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294690A (en) * | 1999-02-22 | 2001-05-09 | 古河电气工业株式会社 | Optical transmission line, negtive dispersion optical fiber used for optical transmission line, and optical transmission system comprising optical transmission line |
| US20130064554A1 (en) * | 2010-01-27 | 2013-03-14 | University Of Central Florida Research Foundation Inc. | Optical Transmission Using Few-Mode Fibers |
| CN103152099A (en) * | 2013-01-31 | 2013-06-12 | 华中科技大学 | Single-fiber bidirectional transmission system based on mode division multiplexing |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103997386A (en) * | 2014-06-03 | 2014-08-20 | 北京邮电大学 | Method for accurately converting arbitrary modes based on simulated annealing algorithm |
| CN106716874A (en) * | 2014-09-30 | 2017-05-24 | 阿尔卡特朗讯 | A method for producing a quality of transmission estimator for optical transmissions |
| CN106253973B (en) * | 2016-07-25 | 2018-09-18 | 暨南大学 | A kind of long range less fundamental mode optical fibre characteristic measurement method and device |
| WO2021129870A1 (en) * | 2019-12-28 | 2021-07-01 | 华为技术有限公司 | Transmission cable |
| CN111948664A (en) * | 2020-08-18 | 2020-11-17 | 中国科学院光电技术研究所 | Dispersion compensation method of frequency modulation continuous wave laser radar based on dispersion coefficient modulation |
| CN111948664B (en) * | 2020-08-18 | 2022-10-18 | 中国科学院光电技术研究所 | Dispersion compensation method of frequency modulation continuous wave laser radar based on dispersion coefficient modulation |
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Application publication date: 20140416 |