Zhou, Zichuan; (2024) Clock synchronised optical transceivers for short and medium reach optical communication. Doctoral thesis (Ph.D), UCL (University College London).

Text PhD_Thesis_Zichuan_Zhou_14093058.pdf - Accepted Version Access restricted to UCL open access staff until 1 July 2025. Download (36MB)

Abstract

Due to the increasing demand of IT traffic, further short and medium reach communication requires delivering higher capacity to massive number of users. Meanwhile, the emerging timing-critical applications such as self-driving cars and high accuracy positioning require low and stable latency user-cloud communication. Achieving synchronisation between clocks among all nodes is the key enabler for high capacity and low latency communication. Current telecommunication network system replies on Synchronous Ethernet to achieve clock synchronisation among nodes through a hierarchical clock tree. This approach has two main limitations: 1) the clock and data recovery at receiver node adds latency and 2) the clock jitter accumulation impose challenges to maintain optimal sampling clock phase, especially for high baud rate data transmission. In this thesis, we proposed distributing a low jitter clock to all nodes, receiver side clock recovery can be significantly simplified, enabling high baud rate data transmission with low processing latency, this is known as clock synchronisation technique. We have demonstrated a real-time low reconfiguration latency (≤ 50ns) clock synchronised 51.2 GBd wavelength switched data centre interconnection. We also utilized optical frequency comb to achieve synchronised clock and optical carrier distribution, which enables user to transmit within dedicated bandwidth in access network upstream communication, ensuring low and stable latency. With such scheme, we demonstrated frequency division multiplex upstream with 64 users, achieving aggregated data rate of 240Gb/s. We further explored using optical frequency comb for synchronised clock and RF carriers distribution in wireless point-to-point transmission, which mitigates clock recovery and enables multiple frequency bands transmission. A multi-band 3.6Gb/s wireless transmission at 12.5, 25 and 37.5GHz is demonstrated. In summary, in this thesis, we have demonstrated 1) clock synchronised transceiver for data centre interconnection, achieving ultra-low latency communication, 2) clock and optical carrier synchronised transceiver enabling low and stable latency access network upstream and 3) clock and RF carrier synchronised transceiver for high capacity multi-band wireless transmission.

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