Open AccessA Broadband, Rectangular, and Self-Sustained Optical Frequency Comb Generation Employing Recirculation Frequency Shifter
Author(s) -
Jingliang Liu,
Anni Liu,
Jian Dai,
Yue Zhou,
Jianqiang Li,
Yitang Dai,
Feifei Yin,
Kun Xu
Publication year - 2017
Publication title -
ieee photonics journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 73
eISSN - 1943-0655
pISSN - 1943-0647
DOI - 10.1109/jphot.2017.2745707
Subject(s) - engineered materials, dielectrics and plasmas , photonics and electrooptics
To generate a self-sustained rectangular optical frequency comb (OFC) with tunable spacing and bandwidth, we propose and experimentally demonstrate a novel scheme by using an optoelectronic oscillator employing recirculation frequency shifter (RFS) loop. In this scheme, the oscillating signal is separated to drive the Mach–Zehnder modulator (MZM) in the oscillation loop and the inphase/quadrature modulator in the RFS loop separately. Then more than 50-tone OFCs, which have a rectangular spectral profile and the flatness better than 6 dB, are obtained with 8-GHz spacing and 10-GHz spacing by tuning the center frequency of the microwave filter respectively. Besides, the phase noise of the driving signals are both lower than $-$