Online matt Raman amplifier with automatic shutdown and starting and control method thereof

Abstract

The invention relates to an online matt Raman amplifier with automatic shutdown and starting and a control method thereof. An output end of a pump laser unit group is connected with a pump end of a combiner, a public end of the combiner is connected with a transmission optical fiber, a signal end of the combiner is connected with an input end of a spectro-coupler, the big end of the spectro-coupler is a signal output end, the small end of the spectro-coupler is connected with the public end of a signal band-pass filter, a reflection end of the signal band-pass filter is connected with a detector of noise outside bandwidth, a transmission end is connected with a detector of signal plus the noise within the bandwidth, the signal output ends of the detector of the noise outside the bandwidth and the detector of the signal plus the noise within the bandwidth are respectively connected with a signal input end of a control unit, and the signal output end of the control unit is connected with the pump laser unit group. The method is to realize the signal power detection and the ASE compensation according to the method of detecting the ASE power of the Raman amplifier outside the working bandwidth and the total power of the ASE within the working bandwidth and the signal. The method can accurately detect the actual power of the signal and automatically shut down and start the amplifier according to the level of the signal power.

Description

technical field [0001] The invention relates to a distributed Raman fiber amplifier. In particular, it relates to a Raman amplifier capable of accurately detecting signal power and realizing online automatic shutdown and startup without light according to the signal power and a control method thereof. Background technique [0002] With the commercialization of 10Gb / s, the potential demand of 3G wireless communication, IPTV and other communication systems, the demand of operators for communication bandwidth continues to expand, the number of optical channels and single channel code rate continue to increase, ultra-long-distance, ultra-large-capacity optical transmission The system has become a research hotspot. The 40Gb / s system is gradually commercialized, and the high-speed, high-capacity system requires an optical amplifier with wider gain bandwidth and lower noise figure. The Raman amplifier uses transmission fiber as its gain medium, and through distributed amplificati...

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Problems solved by technology

In terms of cost, comb filters are expensive and not suitable for mass production; in terms of application flexibility, for a system with a channel spacing of 100 GHz, 50 GHz or 25 GHz Interleaver must be used. If 50 GHz Interleaver is used, 50 GHz The channel spacing system will not be applicable, and this solution will not be able to achieve online upgrades. It is the same as the second solution in the US patent US.

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