Zhou, Zichuan; Liu, Zhixin; (2024) Optical frequency combs applications for synchronous transmission. In: Perego, Auro Michele and Ellis, Andrew, (eds.) Optical Frequency Combs: Trends in Sources and Applications. (pp. 285-304). CRC Press: Boca Raton, Florida, USA.

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Abstract

This chapter focuses on exploring optical frequency comb technology for synchronised clock, radio-frequency (RF) carrier, and optical carrier distribution in radio access networks and optical access networks. Largescale clock distribution can be realised by detecting the entire optical frequency comb. The coherence between neighbouring comb lines results in low phase noise photo-mixing terms and the fundamental term can be used for clock distribution, which enables timing-sensitive application. In a radio access network, a similar concept can be applied, the higher order photo-mixing terms between comb lines can be naturally used as frequency synchronised low phase noise RF carriers, which facilitates wideband high-capacity wireless data transmission. On the other hand, in optical access network, optical frequency combs are used as optical frequency reference to lock multiple free-running lasers at user end, which enables dense frequency-division-multiplexing upstream communication with low cost and power consumption. More importantly, compared to conventional time-division–multiplexing, this approach ensures stable and low latency between user and cloud by allowing all users to transmit within dedicated bandwidth instead of time-sharing, which is critical for latency sensitive applications.

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