A single-fiber bidirectional optical fiber transmission system based on asymmetric modulation spectrum
A technology of modulation spectrum and optical fiber transmission, which is applied in the field of single-fiber bidirectional optical transmission system, which can solve the problems of easily receiving wavelength drift and not being able to apply dense wavelength division multiplexing, so as to improve transmission capacity, avoid signal quality degradation, and facilitate installation Effect
Active Publication Date: 2022-02-11
SUN YAT SEN UNIV
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[0006] In order to solve the problem that the current single-fiber bidirectional transmission system is easily affected by wavelength drift and cannot be applied to dense wavelength division multiplexing when the wavelength spectrum is staggered, the present invention proposes a single-fiber based on asymmetric modulation spectrum The two-way optical fiber transmission system adjusts the spectral position of the transmitted signal through the asymmetric modulation spectrum, so that the two-way transmitted signal is staggered in the frequency spectrum, the structure is simple, and the feasibility of the system is increased while reducing the influence of backward Rayleigh scattering
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[0035] like figure 1 The structure diagram of the single-fiber bidirectional optical fiber transmission system based on the asymmetric modulation spectrum shown, see figure 1 , including: a first direction signal transceiving module 1, a first multiplexer / demultiplexer 2, a first circulator 3, an intermediate waveguide medium 4, a second multiplexer / demultiplexer 5, a second The circulator 6 and the second direction signal transceiver module 7; the first direction signal transceiver module 1 includes a first direction signal transmission module 11, an asymmetric modulation spectrum module 12, a signal performance monitoring module 13 and a first direction signal receiving module 14, the first direction signal receiving module 14, The two-directional signal transceiving module 7 includes a second directional signal sending module 71 and a second directional signal receiving module 72; the first optical signal sent by the first directional signal sending module 11 is input into ...
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The present invention proposes a single-fiber bidirectional optical fiber transmission system with an asymmetric modulation spectrum, which relates to the technical field of optical fiber communication transmission, and solves the problem that the current single-fiber bidirectional transmission system is easily affected by wavelength drift when the wavelength spectrum is staggered. It cannot be applied to the problem of dense wavelength division multiplexing. The asymmetric modulation spectrum module improves the precise control capability of the signal spectrum position of the traditional single-fiber two-way system, ensures the high spectrum utilization of the single-fiber two-way system, and adjusts and controls the first optical signal. Wavelength, reduce the overlap of the back Rayleigh scattering generated by it and the other party's signal on the spectrum, the signals transmitted by the two parties and the back Rayleigh scattering generated by the other party's signal are staggered in the spectrum, reducing the back Rayleigh scattering In addition, the structure of the asymmetric modulation spectrum module is simple and easy to install, which avoids the phenomenon of signal quality degradation caused by the influence of backward Rayleigh scattering in dense wavelength division multiplexing, and solves the problem that dense wavelength division multiplexing cannot be used. Technology reduces the problem of transmission capacity and improves the bidirectional transmission capacity of single fiber.
Description
technical field [0001] The present invention relates to the technical field of optical fiber communication transmission, more specifically, to a single-fiber bidirectional optical transmission system based on asymmetric modulation spectrum. Background technique [0002] With the development of the information society based on electronic information technology, information resources as the basic development resources, information service industry as the basic social industry, and digitalization and networking as the basic social communication mode, the demand for information transmission bandwidth is constantly increasing. As the main channel of information transmission, optical fiber communication is also continuously improving the transmission capacity. [0003] During the development of optical fiber communication, a variety of technologies have been adopted to improve the efficiency of spectrum use, such as the use of modulation formats with high spectral efficiency or th...
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IPC IPC(8): H04B10/079H04B10/50H04B10/548H04B10/572H04B10/61G02B6/27G02B6/293
CPCH04B10/0795H04B10/503H04B10/548H04B10/572H04B10/61G02B6/2938G02B6/2746
Inventor 易兴文罗念祺江梦江潘竞顺李凡李朝晖
Owner SUN YAT SEN UNIV