SemiAnalysis：Coherent-lite 应对数据中心 400G/lane 挑战
SemiAnalysis 指出，训练与推理基础设施需求激增推动园区规模扩大，园区链路需达到 5 km 以上传输距离，而传统全相干（Full Coherent）系统在 10 km 以下距离因激光器要求严苛、调制器参数及复杂 DSP 而过度设计。Coherent-lite 旨在将相干检测引入数据中心链路，以应对 IM-DD 在未来代际（尤其是 400G/lane）面临的压力。
As the need for training and inference infrastructure grows rapidly, there is demand for increased campus sizes, with the growth mandating campus links have 5 km reach or more. Full Coherent systems are predominantly used in long-haul communications, which ends up being overkill for distances less than 10 km due to stringent laser requirements, better modulator parameters (including a larger drive swing) and a complex DSP. Coherent-lite is an attempt to bring Coherent detection to the datacenter links since IM-DD gets strained with future generations, particularly 400G/lane. (1/5)🧵
来源：SemiAnalysis_ · x.com