Jianwei Tang, Jinlong Wei, Junpeng Liang, Zhaopeng Xu, Tianfeng Zhao, Chen Cheng, Yaguang Hao, Bang Yang, Zhongliang Sun, Ke Li, Yunchen Li, Lingjun Zhou, Zhixue He, Yanfu Yang, Weisheng Hu
Clock recovery (CR) algorithms that support higher baud rates and advanced modulation formats are crucial for short-distance optical interconnections, and it is desirable to push CR to operate at baud rate with minimal computing resources and power. In this Letter, we proposed a hardware-efficient and multiplication operation-free baud-rate timing error detector (TED) as a solution to meet these demands. Our approach involves employing both the absolute value of samples and the nonlinear sign operation to emphasize the clock tone, which is deteriorated by severe bandwidth limitation in Nyquist and faster than Nyquist (FTN) systems...
May 1, 2024: Optics Letters