Photonics Research, 2018, 6 (10): 10000948, Published Online: Sep. 7, 2018  

Soliton regulation in microcavities induced by fundamental–second-harmonic mode coupling

Author Affiliations
Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
Abstract
Microcomb generation with simultaneous χ(2) and χ(3) nonlinearities brings new possibilities for ultrabroadband and potentially self-referenced integrated comb sources. However, the evolution of the intracavity field involving multiple nonlinear processes shows complex dynamics that are still poorly understood. Here, we report on strong soliton regulation induced by fundamental–second-harmonic (FD-SH) mode coupling. The formation of solitons from chaos is extensively investigated based on coupled Lugiato–Lefever equations. The soliton generation shows more deterministic behaviors in the presence of FD-SH mode interaction, which is in sharp contrast with the usual cases where the soliton number and relative locations are stochastic. Deterministic single soliton transition, soliton binding, and prohibition are observed, depending on the phase-matching condition and coupling coefficient between the fundamental and second-harmonic waves. Our finding provides important new insights into the soliton dynamics in microcavities with simultaneous χ(2) and χ(3) nonlinearities and can be immediate guidance for broadband soliton comb generation with such platforms.

Xiaoxiao Xue, Xiaoping Zheng, Bingkun Zhou. Soliton regulation in microcavities induced by fundamental–second-harmonic mode coupling[J]. Photonics Research, 2018, 6(10): 10000948.

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