Analysis in distributed Raman amplification

Abstract We theoretically analyze a distributed Raman amplification (DRA) with counter-pumped by combining multi-section model and target shooting arithmetic, present the evolutions of the signal power, the pump power, the DRS power and optical signal–noise-ratio (OSNR) along the transmission fiber with different pump powers in two different cases: one is without an isolator and another with an isolator, find from those evolutions that there exists an optimal placement for the isolator so that DRA has maximum OSNR and gain, and that with an isolator put optimally, the gain of DRA can be gotten by effective value of input pump.

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