Breaking the limitation of mode building time in an optoelectronic oscillator

Tengfei Hao, Qizhuang Cen, Yitang Dai, Jian Tang, Wei Li, Jianping Yao (), Ninghua Zhu () and Ming Li ()
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Tengfei Hao: Institute of Semiconductors, Chinese Academy of Sciences
Qizhuang Cen: Beijing University of Posts and Telecommunications
Yitang Dai: Beijing University of Posts and Telecommunications
Jian Tang: Institute of Semiconductors, Chinese Academy of Sciences
Wei Li: Institute of Semiconductors, Chinese Academy of Sciences
Jianping Yao: University of Ottawa, Ottawa
Ninghua Zhu: Institute of Semiconductors, Chinese Academy of Sciences
Ming Li: Institute of Semiconductors, Chinese Academy of Sciences

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract An optoelectronic oscillator (OEO) is a microwave photonic system with a positive feedback loop used to create microwave oscillation with ultra-low phase noise thanks to the employment of a high-quality-factor energy storage element, such as a fiber delay line. For many applications, a frequency-tunable microwave signal or waveform, such as a linearly chirped microwave waveform (LCMW), is also needed. Due to the long characteristic time constant required for building up stable oscillation at an oscillation mode, it is impossible to generate an LCMW with a large chirp rate using a conventional frequency-tunable OEO. In this study, we propose and demonstrate a new scheme to generate a large chirp-rate LCMW based on Fourier domain mode locking technique to break the limitation of mode building time in an OEO. An LCMW with a high chirp rate of 0.34 GHz/μs and a large time-bandwidth product of 166,650 is demonstrated.

Date: 2018
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DOI: 10.1038/s41467-018-04240-6

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