Abstract
We put forward a new all-optical I/Q regeneration scheme for quadrature amplitude modulation (QAM) signals with rectangular constellation. In the proposed scheme, two phase-preserving amplitude and phase shift key (PP-APSK) regeneration units are built up by optimizing the nonlinear amplified fiber loop mirror. The phase-preserving amplitude regeneration characteristics obtained by simulation are identical with the theoretical results. Our simulation shows that the maximum noise reduction ratios of the proposed regenerators are up to 3 dB, 6.9 dB, and 4.5 dB at the input optical signal-to-noise ratio of about 26 dB for 8QAM, 16QAM and 32QAM signals, respectively.
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