An optical frequency comb generation scheme using time-to-frequency conversion and optical fiber-loop modulation is proposed and demonstrated experimentally. Flat-top optical pulse train from an intensity modulator is injected into a fiber loop, which includes a phase modulator and an amplifier and is cyclically modulated by the phase modulator, to generate abundant optical comb lines. A total of 110 comb lines with 3-dB spectral power variation and 10-GHz frequency spacing are obtained. The proposed scheme is relatively simple and uses only one intensity modulator and one phase modulator.
© 2013 Chinese Optics Letters
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.5060) Fiber optics and optical communications : Phase modulation
(230.2090) Optical devices : Electro-optical devices
(060.5625) Fiber optics and optical communications : Radio frequency photonics
Fiber Optics and Optical Communications
Yujie Dou, Hongming Zhang, Yang Wang, and Minyu Yao, "Flat-top optical frequency comb generation based on optical fiber-loop modulation with external injection," Chin. Opt. Lett. 11, 070603- (2013)