Optimization of pumping schemes for 160-Gb/s single channel Raman amplified systems

Lin Xu, Karsten Rottwitt, Christophe Peucheret, Palle Jeppesen

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    Three different distributed Raman amplification schemes-backward pumping, bidirectional pumping, and second-order pumping-are evaluated numerically for 160-Gb/s single-channel transmission. The same longest transmission distance of 2500 km is achieved for all three pumping methods with a 105-km span composed of superlarge effective area fiber and inverse dispersion fiber. For longest system reach, second-order pumping and backward pumping have larger pump power tolerance than bidirectional pumping, while the optimal span input signal power margin of second-order pumping is the largest and gets 5-dB improvement compared to backward pumping. Span loss tolerance increased to 140 km with more than 2000-km reach. Optimal signal power variation at both ends of the span can provide about 6-dB positive net gain.
    Original languageEnglish
    JournalI E E E Photonics Technology Letters
    Issue number1
    Pages (from-to)329-331
    Publication statusPublished - 2004

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