Soliton microwave oscillators using oversized billion Q optical microresonators

Author:

Yao Lu1,Liu Peng1,Chen Hao-Jing1ORCID,Gong Qihuang123,Yang Qi-Fan12ORCID,Xiao Yun-Feng123ORCID

Affiliation:

1. Peking University

2. Shanxi University

3. Peking University Yangtze Delta Institute of Optoelectronics

Abstract

Microresonator soliton frequency combs offer unique flexibility in synthesizing microwaves over a wide range of frequencies, while their phase noise is currently limited by thermal noise. Enlarging the mode volume would mitigate thermal noise but also raise power consumption. Here, we fabricate optical microresonators with large mode volumes by lathe machining high-purity fiber preforms. Quality factors greater than 4 billion result in a record-low threshold power of 110 µW to initiate comb operation in millimeter-sized devices. The synthesized X-band microwaves with an absolute phase noise level of 107 ( 133 ) d B c / H z at 1(10) kHz offset frequency feature considerable noise reduction compared to other silica-microresonator-based oscillators, which are further used to cope with high-speed data links as carrier waves. Our work illuminates a pathway toward low-noise photonic microwave generation as well as the quantum regime of soliton microcombs.

Funder

Beijing Municipal Science & Technology Commission

Beijing Municipal Natural Science Foundation

National Natural Science Foundation of China

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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