2R optical regeneration: an all-optical solution for BER improvement
Rochette, M.; Libin Fu; Taapos;eed, V.; Moss, D.J.; Eggleton, B.J.
Selected Topics in Quantum Electronics, IEEE Journal of
Volume 12, Issue 4, July-Aug. 2006 Page(s):736 - 744
Digital Object Identifier   10.1109/JSTQE.2006.876611
Summary:We show both theoretically and experimentally that signal re-amplifying and reshaping (2R) optical regenerator based on self-phase-modulation (SPM)-induced spectral broadening followed by optical filtering has significant advantages over conventional 2R regenerators. By discriminating amplified spontaneous emission noise from a pulsed signal, the SPM-based regenerator is able to selectively attenuate noise more than the pulsed signal. This unique feature results in a direct improvement in bit-error ratio (BER) of a noisy pulsed signal, whereas conventional 2R regenerators can only prevent BER degradation-not actually improve it. We compare the two classes of regenerator and highlight their fundamental differences. We also demonstrate the BER improvement of a noisy signal filtered with an SPM-based regenerator that utilizes a highly nonlinear silica fiber, and present a compact version by exploiting a short length of As₂Se₃ chalcogenide glass fiber

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