Single-fiber bidirectional optical fiber transmission system based on asymmetric modulation spectrum

Abstract

The invention provides a single-fiber two-way optical fiber transmission system of an asymmetric modulation frequency spectrum, relates to the technical field of optical fiber communication transmission, and solves the problem that a current single-fiber two-way transmission system is easily influenced by wavelength drift and cannot be suitable for dense wavelength division multiplexing when adopting a wavelength frequency spectrum staggered mode. The precise control capability of the signal spectrum position of a traditional single-fiber bidirectional system is improved through the asymmetric modulation spectrum module, the high spectrum utilization rate of the single-fiber bidirectional system is guaranteed, the wavelength of a first optical signal is adjusted and controlled, overlapping of backward Rayleigh scattering generated by the first optical signal and a signal of the other party on the spectrum is reduced, the backward Rayleigh scattering generated by the signals transmitted by the two parties and the signals of the opposite party is staggered on the frequency spectrum, the influence caused by the backward Rayleigh scattering is reduced, the asymmetric modulation frequency spectrum module is additionally arranged, the structure is simple, installation is convenient, the phenomenon that the signal quality is reduced due to the influence of the backward Rayleigh scattering in dense wavelength division multiplexing is avoided, the problem that the transmission capacity cannot be reduced by using a dense wavelength division multiplexing technology is solved, and the single-fiber bidirectional transmission capacity is improved.

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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Problems solved by technology

[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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