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本文提出一种50Gb/s PAM-4双向塑料波导链路，利用基于PI的Costas环实现载波同步。通过初始化时校正极性反转并由Costas环锁定相位偏移，实现了低功耗、高能效的载波恢复。该架构简单且对带宽要求宽松，适合高速数据通信。
Huxian Jin1, Tai young Kim1, Woohyun Kwon2, Kyoohyun Lim1, Konan Kwon1, Chang-Ahn Kim1, Taeho Kim1, Jun Gi Jo1, Jake Eu1, Sean Park1, Hyeon-Min Bae2 Point2 technology, Seoul, Korea KAIST, Daejeon, Korea of the I-DCM converges to the maximum but the output polarity is inverted. The correction for the polarity inversion can be performed when initializing the link and the following phase offset after the initialization is forced to the origin by the Costas loop. A power-efficient implementation of the PI-based Costas loop is enabled by its simple architecture and relaxed requirements on the bandwidth. The 70GHz transceiver adopts the architecture of the direct-conversion to utilize the wideband characteristics of the E-TUBE channel. 1 2 The demand for greater I/O bandwidth in data centers is increasing due to the explosive growth of network traffic. However, conventional high-speed interconnects are struggling with the challenges
Ha-Il Song1, Hanho Choi1,2, Jun young Yoo1, Hyo-Sup Won1, Cheong Min Lee1,