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Flat soliton microcomb source
扁平孤子微梳源
平面孤立子マイクロ叢源
평면 고립자 미세 총원
Fuente de microclase de aislamiento plano
Source de sous - plexus isolés planaires
плоский изолированный субкластерный источник
Xinyu Wang 王信宇 ¹, Xuke Qiu 邱旭科 ², Mulong Liu 柳牧龙 ³, Feng Liu 刘峰 ², Mengmeng Li 李萌萌 ², Linpei Xue 薛林培 ², Bohan Chen 陈博涵 ², Mingran Zhang 张明然 ⁴, Peng Xie 谢鹏 ² ⁵
¹ School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, China
中国 北京 中国科学院大学未来技术学院
² Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
³ School of Science, Northwest A&F University, Yangling 712100, China
中国 杨凌 西北农林科技大学理学院
⁴ Department of Physics, City University of Hong Kong, Kowloon, Hong Kong, SAR, China
中国 香港 香港城市大学物理学系
⁵ School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore
Opto-Electronic Science, 29 December 2023
Abstract

Mode-locked microcombs with flat spectral profiles provide the high signal-to-noise ratio and are in high demand for wavelength division multiplexing (WDM)-based applications, particularly in future high-capacity communication and parallel optical computing.

Here, we present two solutions to generate local relatively flat spectral profiles. One microcavity with ultra-flat integrated dispersion is pumped to generate one relatively flat single soliton source spanning over 150 nm. Besides, one extraordinary soliton crystal with single vacancy demonstrates the local relatively flat microcomb lines when the inner soliton spacings are slightly irregular.

Our work paves a new way for soliton-based applications owing to the relatively flat spectral characteristics.
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