Optical frequency comb generation based on three parallel Mach-Zehnder modulators with recirculating frequency shifting loop

摘要

We theoretically and numerically study an approach for optical frequency comb (OFC) generation, by utilizing recirculating frequency shifting (RFS) loop based on three parallel Mach-Zehnder modulators (MZMs). Our results show that three parallel MZMs can generate a single-side-band (SSB) signal with 36 dB optical carrier suppression (OCS) ratio. Furthermore, the 60-tone OFC signal with 30 dB side-mode suppression ratio (SMSR) and 4 dB maximum power fluctuation is achieved, and 20 of the OFC signal possess the power fluctuation of less than 1 dB. Our approach provides a novel way of generating OFC with excellent SMSR and good power fluctuation.