Low-noise remote pump EDFA

Abstract

The invention relates to a low-noise remote pump EDFA. The low-noise remote pump EDFA comprises a passive gain unit, an optical cable part and a pump unit part; the passive gain unit is formed by connecting a first optical isolator ISO1, a first wavelength division multiplexer WDM1, a first erbium doped fiber EDF1, a second wavelength division multiplexer WDM2, a second optical isolator ISO2, a gain flattening filter, a third wavelength division multiplexer WDM3, a second erbium doped fiber EDF2, a dichroic mirror and an optical isolator ISO3 in sequence; a pump source is formed by combining an EDFA pump source with a Raman pump source, the Raman pump source is used for amplifying the EDFA pump source, the purpose that pump power injected into the passive gain unit does not change or even is higher under the condition of relative small power of the EDFA pump source is achieved, the non-relay optical transmission distance is prolonged, no cable needs to be laid in the long-distance optical communication optical cable laying process, the laying cost and maintaining cost of circuits are reduced, peak power in the optical cable is reduced, safety of the optical cable is improved greatly, and the maintaining cost of the optical cable is reduced greatly.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a low-noise remote pump EDFA optical amplifier, which is mainly used in the field of long-distance unrepeated optical communication. Background technique [0002] At present, in order to solve the problem of optical power loss in long-distance optical fiber communication, there are two main solutions: EDFA amplifier and Raman amplifier. [0003] The solution to using EDFA amplifiers is to place EDFA optical amplifiers at different nodes of the transmission cable to achieve the purpose of compensating for optical link loss. Its main disadvantage is that EDFA is an active centralized optical amplifier. Therefore, when laying optical cables, it is necessary to consider laying transmission cables to provide power for EDFAs at each node. This will not only increase the cost of line laying, but also greatly increase the cost of line maintenance, especially It is more prominent in ...

AI Technical Summary

Problems solved by technology

First, it is difficult to design a high-power pump source. The current process technology can only reach 700mW. After long-distance transmission, the power to the passive gain unit cannot meet the pump power requirements. Therefore, the transmission distance is very limited. , generally around 50km

[0006] In order to solve the problem of short transmission distance of the current long-distance pump EDFA optical amplifier, this invention proposes the method of using Raman to amplify the EDFA pump source to increase the pump power of the front-end passive gain unit, thereby increasing the transmission distance to more than 200km

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