Repeater-less optical fiber transmission system of bypass forward Raman amplifier

Abstract

The invention provides a repeater-less optical fiber transmission system of a bypass forward Raman amplifier. After an optical single transmitted from an optical transmitter passes through an optical power amplifier and a first section of transmission optical fiber, a forward Raman amplifier enters into a signal light transmission optical fiber through the coupling of a first wave-division multiplexer so as to amplify the light signal; the light signal enters into a remote pump optical amplifier through a second section of transmission optical fiber so as to be amplified; a remote pump unit is connected with the remote pump optical amplifier to provide pumping light as a pumping source. And then, the light signal passes through the third section of transmission optical fiber, and a backward optical fiber Raman amplifier enters into the signal light transmission optical fiber through the coupling of the second wave-division multiplexer so as to amplify a weak light signal; and finally, the light signal enters into an optical receiver. A switch gain of the bypass third-order optical fiber Raman amplifier achieves 15-30dB, and a signal to noise ratio of the light signal transmitted by the optical fiber is improved, and then the transmission distance of the repeater-less light signal is prolonged.

Description

technical field [0001] The invention relates to a method for extending the transmission distance of a non-relay optical fiber, in particular to a bypass forward Raman amplification non-repeater optical fiber transmission system which bypasses the forward third-order Raman amplification. Background technique [0002] In the non-repeater optical fiber transmission system, it is necessary to realize optical signal transmission with high capacity and as long as possible non-repeater distance. The so-called non-relay means that there is no local optical amplification device and electrical processing unit in the optical signal transmission link except the optical transmitter and optical receiver. However, long-distance optical remote-pumped erbium-doped fiber amplifiers (ROPA) and distributed Raman fiber amplifiers can be used in the transmission link. At present, in the common unrepeated optical fiber transmission system, the optical signal sent by the transmitter (Tx) is amplif...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiency of forward Raman amplification in the existing non-relay optical fiber transmission system, the present invention provides a non-repeater optical fiber transmission system with bypass forward Raman amplification. After the optical power amplifier enters the first section of transmission fiber, after a certain distance of transmission, the bypass forward Raman fiber amplifier is coupled into the signal optical transmission fiber through the first wavelength division multiplexer to amplify the optical signal

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