Hybrid optical fiber amplifier, optical signal amplification method and optical communication system

Abstract

The embodiment of the present application discloses a hybrid optical fiber amplifier, an optical signal amplification method, and an optical communication system. The hybrid optical fiber amplifier includes: an erbium-doped optical fiber amplifier, which is used to amplify optical signals in the C and L bands in the optical path, and Filter out the part of the amplified C and L band optical signals whose gain exceeds the set threshold, so that the power of the C and L band optical signals output to the rear end of the optical path is balanced in each channel; the lumped Raman fiber amplifier, The input end is connected to the output end of the erbium-doped fiber amplifier through a highly nonlinear optical fiber or a dispersion-compensating optical fiber, and is used to amplify the optical signals that are not amplified by the erbium-doped fiber amplifier in the output optical signals of the C and L bands . Both EDFA and Raman in this application are lumped fiber amplifiers, and their gain control can be realized through local input and output power detection, and the gain control is very convenient.

Description

technical field [0001] Embodiments of the present application relate to optical fiber communication technology, and in particular to a hybrid optical fiber amplifier supporting C+L frequency band amplification, an optical signal amplification method, and an optical communication system. Background technique [0002] In the field of optical communication, in order to make the communication system have a large enough capacity, the ultra-broadband fiber amplifier becomes one of the essential devices. Erbium-doped fiber amplifier (EDFA, Erbium-Doped Fiber Amplifier) ​​and Raman fiber amplifier (RFA, Raman Fiber Amplifier) ​​has been widely used in optical communication systems. With the gradual commercialization of single-channel 400G coherent communication systems, the channel spacing is getting larger and larger. The traditional 50GHz spacing can no longer meet the requirements of high-speed communication systems. Currently, based on dual The minimum channel spacing of carrier...

AI Technical Summary

Problems solved by technology

[0003] In the current existing technical scheme, if the C+L-band is amplified, the C+L-band must be separated into two independent C-bands and L-bands, and then separately amplified and then passed through wavelength division multiplexing (WDM, Wavelength DivisionMultiplexing) method for multiplexing, so that there are always several wavelengths (3-5nm bandwidth) in the middle of the frequency band that are lost due to multiplexing

In the current technology, there are also hybrid amplifiers composed of distributed Raman fiber amplifiers and EDFA, but the operating wavelength of distributed RFA and EDFA is the same. This hybrid fiber amplifier mainly utilizes the characteristics of low noise index of distributed Raman fiber amplifiers , reduce the noise figure of the hybrid fiber amplifier, improve the optical signal-to-noise ratio (OSNR, Optical SignalNoise Ratio) of the system, instead of widening the channel bandwidth, due to the difficulty of automatic gain control of the distributed Raman fiber amplifier, the traditional hybrid fiber amplifier The gain control of the

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