Abstract

This paper reviews the recent advances on nonlinear-optical loop mirror (NOLM)-based all-optical multilevel amplitude regenerator. Two different NOLM-based regenerator schemes, including the conventional single NOLM and the polarization-orthogonal continuous-wave-light-assisted NOLM (PC-NOLM) have been compared for the regenerative performance. The results show that the conventional NOLM regenerator gives a larger amplitude-noise handling capability on the low regenerative level, but the proposed PC-NOLM scheme offering the same regenerative behaviours on multiple levels significantly improves the noise suppression on the high-order amplitude level. The uniform regenerative performance achieved in the PC-NOLM structure also results in a better EVM improvement, i.e. 2.33 dB in the experiment.

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