Journal
OPTICS EXPRESS
Volume 27, Issue 6, Pages 9266-9275Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.27.009266
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Funding
- National Natural Science Foundation of China (NSFC) [61775132, 61735015, 61620106015]
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We propose a broadband and high-resolution dual-comb interferometer (DCI) realized with dense electro-optic frequency combs (EOFCs), which are generated with two-stage electro-optic modulation and nonlinear fiber spectral broadening. The broadband coarse comb is generated in the first-stage modulation and the space between neighboring combs is filled with a dense electrical comb in the second-stage modulation. The spectral resolution of the DCI can be flexibly changed from 10 MHz to 1 GHz easily as required, and electro-optic DCIs with 10-MHz, 100-MHz, and 1-GHz frequency, resolutions are experimentally realized. Meanwhile, DCI working in the quasi-integer-ratio mode is easily implemented in this system for the increased refresh rate and improved figure of merit especially for high resolution. As a demonstration, 150000 comb lines with 10 MHz frequency interval arc resolved in the experiment. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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