Modeling the Performance of the Clock Phase Caching Approach to Clock and Data Recovery
Modeling the Performance of the Clock Phase Caching Approach to Clock and Data Recovery
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DOI：
10.1109/jlt.2021.3130955
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发表时间：
2022-03-15
影响因子：
4.7
通讯作者：
Liu, Zhixin
中科院分区：
文献类型：
--
作者：
Clark, Kari A.;Liu, Zhixin
光交换可以使数据中心网络跟上数据中心内部流量的快速增长，然而，亚纳秒时钟和数据恢复时间对于使光交换数据中心网络以90%以上的效率传输以小包为主的数据中心流量至关重要。我们回顾了时钟和数据恢复的时钟同步方法，它可以在光交换网络中实现亚纳秒的切换时间。然后，我们引入了一个分析模型，从数学上探讨了时钟相位缓存的操作，并利用该模型探讨了光纤温度、时钟抖动和符号率等因素对时钟相位缓存方法的误码率、时钟和数据恢复锁定时间性能的影响，以及它们对可扩展性的影响。使用与我们之前实验研究中使用的数据中心参数相匹配的商业数据中心参数，我们发现我们的分析模型提供了与我们之前的实验结果密切匹配的估计，验证了其用于预测时钟相位缓存系统性能的用途。
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.