期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 40, 期 6, 页码 1681-1689出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2021.3130955
关键词
Clocks; Optical switches; Optical transmitters; Adaptive optics; Optical receivers; Synchronization; Optical network units; Data center networks; optical switching; clock synchronization; clock and data recovery; clock phase caching
资金
- EPSRC [EP/R041792/1, EP/V051377/1, EP/R035342]
- Royal Society Paul Instrument Fund [PIF/R1/180001]
This paper explores the use of clock-synchronized approach in optical switching networks and introduces an analytical model to evaluate the performance and scalability of clock phase caching method. The model is validated using experimental results and provides accurate predictions.
Optical switching could enable data center networks to keep pace with the rapid growth of intra-data center traffic, however, sub-nanosecond clock and data recovery time is crucial to enabling optically-switched data center networks to transport small packet dominated data center traffic with over 90% efficiency. We review the clock-synchronized approach to clock and data recovery, which enables sub-nanosecond switching time in optically switched networks. We then introduce an analytical model to mathematically explore the operation of clock phase caching, and use this model to explore the impact of factors such as fiber temperature, clock jitter and symbol rate on the BER and clock and data recovery locking time performance of the clock phase caching approach, as well as their impact on scalability. Using commercial data center parameters matching those used in our previous experimental research, we find that our analytical model provides estimates that closely match our previous experimental results, validating its use for making predictions of the performance of clock phase cached systems.
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