Abstract

Dissipative Kerr cavity soliton and optical frequency comb (OFC) can be generated in fiber cavities or microresonators with anomalous group velocity dispersion (GVD), which has achieved great breakthroughs and found significant applications in many fields. Despite recent progress in this field, it remains challenging to obtain OFCs with a flat-top spectrum and a high conversion efficiency in an optical cavity with anomalous GVD. In this paper, intra-cavity dispersion engineering is proposed to reshape the bright dissipative Kerr solitons in a Brillouin laser cavity with anomalous GVD for generating flat-top OFCs with a high conversion efficiency. By introducing a piece of optical fiber with normal GVD into the above Brillouin fiber laser cavity for making a hybrid fiber cavity with near zero net cavity GVD, the intra-cavity waveform is broadened in time-domain due to the existence of normal GVD, which conquers the pulse compression caused by four-wave mixing and anomalous GVD, and leads to the formation of bright dissipative Kerr solitons and OFCs with a flat-top profile and a high conversion efficiency, via interlocking of up-switching waves. Furthermore, flat-top OFCs with step tunable mode spacing from GHz to THz are achieved via intra-cavity dispersion engineering.

Temporal soliton and optical frequency comb generation in a Brillouin laser cavity

Yali Huang, Qing Li, Junyuan Han, Zhixu Jia, Yongsen Yu, Yuede Yang, Jinlong Xiao, Jiliang Wu, Daming Zhang, Yongzhen Huang, Weiping Qin, and Guanshi Qin
Optica 6(12) 1491-1497 (2019)

Dispersion engineering in a Brillouin fiber laser cavity for Kerr frequency comb formation

Moise Deroh, Erwan Lucas, and Bertrand Kibler
Opt. Lett. 48(24) 6388-6391 (2023)

Intra–cavity flat–top beam generation

Igor A. Litvin and Andrew Forbes
Opt. Express 17(18) 15891-15903 (2009)

Advanced dispersion engineering of a III-nitride micro-resonator for a blue frequency comb

Ali Eshaghian Dorche, Doğan Timuçin, Krishnan Thyagarajan, Thomas Wunderer, Noble Johnson, and David Schwartz
Opt. Express 28(21) 30542-30554 (2020)

Experimental observations of bright dissipative cavity solitons and their collapsed snaking in a Kerr resonator with normal dispersion driving

Zongda Li, Yiqing Xu, Stéphane Coen, Stuart G. Murdoch, and Miro Erkintalo
Optica 7(9) 1195-1203 (2020)