Abstract

Single soliton microcombs enable the chip-scaled comb source with an extremely high repetition rate suitable for many applications. However, it is challenging to deterministically generate a single soliton due to the thermal effect and the stochastic soliton formation. Meanwhile, mode coupling induced avoided mode crossings (AMXs) also affect the soliton generation. Here, we analyze the thermal compensation effect of an auxiliary laser on the single soliton generation based on a Si₃N₄ micro-resonator with weak AMXs. Both simulation and experiments demonstrate that only in a proper blue-detuned range of the auxiliary laser can achieve the high-probable single soliton generation. Based on the above observation, we present a program-controlled scheme for reliable single soliton generation based on the red-detuned pump entrance forward tuning method. A single soliton is successfully generated in 100 trials with a 100% success rate. We also stabilize the single soliton generation by pump back tuning and feedback control of the auxiliary wavelength and achieve more than 5 hours of the soliton duration time in the experiments.

Program-controlled single soliton microcomb source

Xinyu Wang, Peng Xie, Weiqiang Wang, Yang Wang, Zhizhou Lu, Leiran Wang, Sai T. Chu, Brent E. Little, Wei Zhao, and Wenfu Zhang
Photon. Res. 9(1) 66-72 (2021)

Repetition rate locked single-soliton microcomb generation via rapid frequency sweep and sideband thermal compensation

Runlin Miao, Chenxi Zhang, Xin Zheng, Xiang’ai Cheng, Ke Yin, and Tian Jiang
Photon. Res. 10(8) 1859-1867 (2022)

Turn-key Kerr soliton generation and tunable microwave synthesizer in dual-mode Si₃N₄ microresonators

Haizhong Weng, Michael McDermott, Adnan Ali Afridi, Huilan Tu, Qiaoyin Lu, Weihua Guo, and John F. Donegan
Opt. Express 32(3) 3123-3137 (2024)

Thermal tuning of mode crossing and the perfect soliton crystal in a Si₃N₄ microresonator

Jin Li, Shuai Wan, Jin-Lan Peng, Zheng-Yu Wang, Rui Niu, Chang-Ling Zou, Guang-Can Guo, and Chun-Hua Dong
Opt. Express 30(8) 13690-13698 (2022)

Thermal control of a Kerr microresonator soliton comb via an optical sideband

Kenji Nishimoto, Kaoru Minoshima, Takeshi Yasui, and Naoya Kuse
Opt. Lett. 47(2) 281-284 (2022)