Investigation of Crosstalk in Channels by Using Fiber Raman Amplifiers

ISSN： 1096-4681

Source： Fiber And Integrated Optics, Vol.31, Iss.5, 2012-09, pp. : 328-340

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Abstract

This study has investigated the effects of crosstalk in fiber Raman amplifiers by propagating two channels simultaneously through the same Raman fiber. The quality factor reduces for higher bit rates and lesser channel spacing. The signals have been propagated in two channels at a bit-rate of 10 Gb/s with spacing of 50 GHz, and a quality factor above 35 dB is obtained. The effect of signal input power and injected pump power on crosstalk and signal interference ratio is also studied up to 40 Gb/s. It is observed that the signal gain and injected pump power should be limited to the value well below the threshold of Raman amplification to ensure small crosstalk and high signal interference ratio. The effect of Raman fiber length on crosstalk is also studied, and it is observed that for high values of Raman fiber length, signal interference ratio reduces considerably.