All-optical multilevel amplitude regeneration in a single nonlinear optical loop mirror

F. Wen, C. P. Tsekrekos, Y. Geng, X. Zhou, B. Wu, K. Qiu, S. K. Turitsyn, S. Sygletos

Research output: Contribution to journalArticlepeer-review


We experimentally demonstrate all-optical amplitude regeneration of 4-level pulse amplitude modulated signals (PAM4) based on a single nonlinear optical loop mirror (NOLM). Four power-plateau regions are achieved using return-to-zero (RZ) pulses of narrow pulse-width, enabling large nonlinear phase shifts within the highly nonlinear fiber (HNLF). We quantify noise suppression characteristics at each amplitude level and obtain an overall EVM improvement of 0.92dB by optimizing input power and distortion strength. A theoretical analysis has been also carried out matching the experimental results and revealing the design characteristics of the regenerator’s nonlinear transfer function.
Original languageEnglish
Pages (from-to)12698-12706
JournalOptics Express
Issue number10
Publication statusPublished - 14 May 2018

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