Broadband gain spectrum optimization method and device based on cascade Raman amplification assistance

Abstract

The invention provides a broadband gain spectrum optimization method and device based on cascade Raman amplification assistance, and the method comprises the steps: receiving multiple paths of signal light, and carrying out the wavelength division multiplexing operation of the received multiple paths of signal light; respectively selecting signal light of a plurality of wave bands from the signals after the wavelength division multiplexing operation by utilizing a plurality of wavelength selection switches, wherein the plurality of wave bands comprise a plurality of wave bands between a C wave band and a U wave band; amplifying the signal light of the first group of wave bands in the selected signal light of the multiple wave bands through an erbium-doped fiber amplifier (EDFA) under the excitation of the pump light of the first wavelength, and amplifying the signal light of the second group of wave bands through a thulium-doped fiber amplifier (TDFA) under the excitation of the pump light of the second wavelength; amplifying the multiband signal light amplified by the EDFA or the TDFA by a plurality of cascaded backward RFAs respectively; and separating the multiple paths of signal light through wavelength division demultiplexing. The antenna has the advantages of being wide in broadband and high in gain, and enables a broadband gain spectrum to be flatter.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to a cascaded Raman amplification-assisted wide-band gain spectrum optimization method and device. Background technique [0002] In recent years, with the continuous rise of new services such as high-definition video, virtual reality, and 5G, network traffic has increased dramatically. Therefore, there is an urgent need for the expansion of existing optical fiber communication networks and the realization of ultra-long-distance transmission. DWDM technology can effectively expand the capacity of the existing optical fiber backbone network, but the demand for optical fiber transmission bandwidth will become wider and wider in the future. Currently, the wavelengths used for communication are C-band and L-band. In order to meet the future demand for large-capacity optical communication , will extend the communication wavelength to S-band, U-band, etc., which require...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the optical fiber amplifiers in the prior art are difficult to meet the needs of future large-capacity optical communication, the purpose of the present invention is to provide a wide-band gain spectrum optimization method and device based on cascaded Raman amplification assistance. (EDFA / TDFA) combined with Raman fiber amplifiers, using different pump light wavelengths to excite signal lights of different bands in the broadband system, after amplified by doped fiber amplifiers and cascaded Raman fiber amplifiers, it can make the final The superimposed hybrid gain spectrum is flatter and optimized for broadband gain spectrum

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