Optical fiber communication transmission system and method applied to multi-wavelength bidirectional pumping high-order bidirectional Raman amplification

Abstract

The invention discloses an optical fiber communication transmission system and method applied to multi-wavelength pumping high-order bidirectional Raman amplification, which are applied to an ultra-long span optical fiber communication system and a common optical fiber communication system, can reduce one pump light in a multi-wavelength pumped bidirectional high-order Raman amplifier, and solve the problems of high relative intensity noise and low gain efficiency in a current multi-wavelength pumped high-order Raman amplification process and meanwhile reduce the system cost. A pump light closest to a signal light wavelength is reduced on a forward high-order Raman amplifier; and a reflection-type fiber grating filter is inserted respectively at an output end of the forward high-order Raman amplifier and an input end of a backward high-order Raman amplifier, and the central wavelength of the fiber grating is the wavelength of the pump light that has been reduced. The method of the invention can reduce the number of pump lights of the high-order Raman amplifier and reduce cost, and at the same time, reduce the relative intensity noise of the high-order Raman amplifier, greatly improve the backward gain and forward gain efficiency of the high-order Raman amplifier, and extend the transmission distance of a bidirectional high-order Raman fiber communication system.

Description

technical field [0001] The invention relates to the field of optical fiber communication, more specifically, relates to an optical fiber communication system for multi-wavelength pumped bidirectional high-order Raman optical fiber amplification, especially an ultra-long-span optical fiber communication system. Background technique [0002] With the development of optical fiber communication technology, the optical fiber transmission system that requires single-span non-electric relay is getting longer and longer, and the transmission rate is getting higher and higher. In this case, generally using a bidirectional Raman amplifier is the best choice. The optical fiber communication system with bidirectional Raman fiber amplification is divided into first-order Raman amplification and high-order Raman amplification according to the number of pumping lights of the Raman amplifier. Among them, the high-order Raman amplification can greatly expand the gain spectrum of the signal ...

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Problems solved by technology

[0003] However, in the multi-wavelength pumped high-order Raman amplifier, because multiple pump lights are required, the relative intensity noise caused by the optical power fluctuation of each pump light will be transmitted to the signal light that needs to be amplified, resulting in the signal light that needs to be amplified The optical signal-to-noise ratio of the signal light is greatly reduced, which will cause the deterioration of the amplified signal noise

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