Safety monitoring device and method of distributed fiber Raman amplifier

Abstract

The invention discloses a safety monitoring device of a distributed fiber Raman amplifier. The safety monitoring device comprises an intelligent control system which comprises an optical power splitter, two etalons, two optical detectors and a computing control module. An output end of the optical power splitter is connected with input ends of the two etalons; output ends of the two etalons are respectively connected with an input end of one optical detector; and output ends of the optical detectors are connected with the computing control module. The invention further discloses a safety monitoring method of the distributed fiber Raman amplifier. The safety monitoring device and method has the advantages of low cost, implementing easiness and convenience in popularization and commercialization; besides, with small environmental effect, the signal scanning is a dynamic process and the Raman amplifier is switched on and off dynamically, intelligently and quickly in real time; thus, personal safety and system security are protected and interference to systems from ineffective signals is avoided.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to the field of distributed optical fiber Raman amplifiers. Background technique [0002] The optical fiber amplifier is a key module in the optical communication system. With the mass deployment of 40Gb / s optical communication systems, the practical application of 100Gb / s and even 400Gb / s systems is gradually put on the agenda. It is expected that 40Gb / s will be used in 50 More than % need to use fiber Raman amplifier or hybrid amplifier (combined use of Raman amplifier and erbium-doped fiber amplifier), this is because Raman amplifier has the characteristics of low noise, high bandwidth and low nonlinear effect. [0003] Optical fiber Raman amplifiers generally adopt distributed amplification, that is, the amplification process is completed using the Raman effect on the transmission fiber. Compared with traditional discrete erbium-doped fiber amplifiers, Raman amplifiers requ...

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Problems solved by technology

[0003] Optical fiber Raman amplifiers generally adopt distributed amplification, that is, the amplification process is completed using the Raman effect on the transmission fiber. Compared with traditional discrete erbium-doped fiber amplifiers, Raman amplifiers require higher pumping power into the fiber. Due to the distributed nature, the input optical signal power detection cannot be completed inside the module, which brings some new problems: 1) When the transmission fiber is broken, the pump will always be on because the information cannot be detected inside the module , which will cause great safety hazards to users and the environment; 2) When the transmission signal is lost, the Raman effect will still generate spontaneous radiation light, which will be amplified step by step by the post-stage amplifier, and finally reach the receiving end. cause severe disruption to the system

In order to solve the above problems, Chinese patent CN1404237A describes a method of separating signal light and spontaneous emission light by using Interleaver devices, which can effectively solve the above problems, but its disadvantages are high cost and large package size, which is not conducive to large-scale use and future modules miniaturization requirements; while US Patent US.6,423,963 uses an additional monitoring channel to judge the on-off of the optical fiber, but cannot judge the presence or absence of signal light, and not all optical communication systems have loading monitoring channels, making this method The practicability and versatility of the

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