Generation of Flat Optical Frequency Comb Based on FM Laser Operation of Fiber Ring Laser

Masaki HIRANO  Ryosuke YOTSUTANI  Akihiro MORIMOTO  

IEICE TRANSACTIONS on Electronics   Vol.E94-C   No.1   pp.132-133
Publication Date: 2011/01/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E94.C.132
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Lasers, Quantum Electronics
optical frequency comb,  FM laser,  fiber ring laser,  optical phase modulator,  spectral shaping,  

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We obtained flat optical frequency combs by using the FM laser operation of a fiber ring laser and external intensity modulation. Extremely wide FM spectra can be easily obtained by the moderate internal phase modulation of an FM laser. We used an external intensity modulator to extract a linearly chirped part from the FM light in order to obtain flat spectra. In our experiments, we obtained a flat optical frequency comb with a spectral bandwidth of about 0.5 THz and a power deviation of less than 1.5 dB.