Ultrafine electro-optical frequency comb based on cascade phase modulation with cyclic frequency shifting

An ultrafine electro-optical frequency comb (EOFC) with plentiful comb teeth is demonstrated. Adopting a single-frequency fiber laser as a light source, cascade phase modulation based on a sinusoidal signal and a frequency-time transformation (FTT) signal is executed to generate the EOFC with high f...

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Bibliographic Details
Published in:Optics letters 2023-09, Vol.48 (17), p.4665-4668
Main Authors: Wang, Changhe, Sun, Yuxin, Zhao, Qilai, Yang, Changsheng, Zeng, Chun, Feng, Zhouming, Zhang, Yu, Li, Li, Zhou, Kaijun, Wei, Xiaoming, Yang, Zhongmin, Xu, Shanhui
Format: Article
Language:English
Subjects:
Bandwidths
Fiber lasers
Fineness
Light sources
Optical frequency
Phase modulation
Ultrafines
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Summary:An ultrafine electro-optical frequency comb (EOFC) with plentiful comb teeth is demonstrated. Adopting a single-frequency fiber laser as a light source, cascade phase modulation based on a sinusoidal signal and a frequency-time transformation (FTT) signal is executed to generate the EOFC with high fineness. Meanwhile, a cyclic fast frequency shifting strategy is introduced to boost the number of comb teeth and the bandwidth of the EOFC. As a result, an EOFC with 12600 comb lines covering a broad bandwidth from −6.3 GHz to 6.3 GHz is established, corresponding to an ultrafine comb space of 1 MHz. Moreover, the power fluctuation of a comb tooth is less than 0.5 dBm. This state-of-the-art EOFC has significant potential in the field of precision spectroscopy.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.498007