4.5 Article

Broadband EO-Comb Generation Based on Two-Stage Nonlinear System

期刊

IEEE PHOTONICS JOURNAL
卷 14, 期 5, 页码 -

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2022.3203858

关键词

Optical waveguides; Optical fiber dispersion; Optical pulses; Silicon; Optical fiber amplifiers; Nonlinear optics; System-on-chip; Optical frequency comb; integrated silicon nitride waveguide; electro-optical modulation; gas detection

资金

  1. National Key Research and Development Program of China [2020YFB2205804, 62075240]
  2. Science Fund for Distinguished Young Scholars of Hunan Province [2020JJ2036]

向作者/读者索取更多资源

In this paper, a two-stage nonlinear system is built to broaden a 12.5 GHz EO-comb. The system achieves significant spectral broadening and shows potential for application in parallel gas detection.
Optical frequency comb (OFC) has attracted growing interest in various fields, such as frequency metrology, absorption spectroscopy, and instrumental calibrations. Electro-optic modulation (EOM) is one of the main comb-generating methods with the advantageous features of adjustable repetition frequency, high optical signal-to-noise ratio, and intrinsic coherence of the comb teeth. However, the spectral range of the EO-comb is limited by the modulation depth. In this paper, a two-stage nonlinear system is built to broaden a 12.5 GHz EO-comb, namely the fiber-based stage and the on-chip stage. In the fiber-based stage, the pulse width of the comb is compressed to 52 fs from similar to 3 ps, meanwhile, the peak power is amplified to 2053 W and the comb spectrum is moderately broadened. In the on-chip stage, the comb is further broadened by an integrated Si3N4 waveguide spanning from 1200 nm up to 2000 nm. It is worth mentioning that the characteristic absorption lines of water vapor can also be observed in the broadened spectrum. These results indicate that the built system may have great application prospects in the field of parallel gas detection.

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