Acta Photonica Sinica ›› 2019, Vol. 48 ›› Issue (10): 1048003-1048003.doi: 10.3788/gzxb20194810.1048003

• Special Issue on Optical Soliton • Previous Articles     Next Articles

Generation of High Repetition Rate Broadband Flat Coherent Optical Frequency Comb Based on Tantalum Pentoxide Integrated Nonlinear Optical Waveguide

WU Chun-jiang, FENG Su-chun   

  1. Key Laboratory of All Optical Network and Advanced Telecommunication Network, Ministry of Education, Institute of Lightwave Technology, Beijing Jiaotong University, Beijing, 100044, China
  • Received:2019-08-19 Online:2019-10-25 Published:2019-09-19
  • Contact: 2019-09-19 E-mail:schfeng@bjtu.edu.cn
  • Supported by:

    Fundamental Research Funds for the Central Universities (No.2017JBM002), National Natural Science Foundation of China (No.61827818)

Abstract:

Through the waveguide structure design and dispersion engineering, based on the soliton pulse compression, self-phase modulation, and optical wave breaking, a 0.22 m anomalous dispersion tantalum pentoxide waveguide cascaded with a 0.9 m normal dispersion tantalum pentoxide waveguide was used to produce a flat optical frequency comb with a 4 dB flatness and 60 nm bandwidth in the 1 520 nm to 1 580 nm. The spectrogram evolution during the pulse transmission process was analyzed through the X-Frog technique, and the coherence of the optical frequency comb were also studied. The analysis indicates that the self-phase modulation and optical wave breaking effects make the comb spectrum envelop broadened and flattened. The first-order mutual coherence function calculation indicates that the optical frequency comb has good spectral coherence. The simulation results show that the tantalum pentoxide integrated nonlinear optical waveguide has a good prospect in the generation of high repetition rate flat coherent broadband optical frequency comb.

Key words: Soliton compression, Optical wave breaking, Tantalum pentoxide, Self-phase modulation, Optical frequency comb

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