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该论文提出了一种用于3.2pJ/b 24Gb/s QPSK相干光接收机的载波相位恢复环路，旨在解决短距离光互连中传统IM-DD链路数据速率提升困难的问题，通过低功耗相干接收方案实现高能效高速数据传输。
increasing intra-datacenter traffic is pushing the demand for ultra-high-speed optical interconnect that maximizes both power efficiency and data rate per wavelength. Intensity modulation-direct detection (IM-DD) links are used in these short-reach applications because of their simplicity and low power consumption; however, increasing their data rates is becoming exceedingly difficult due to technology- and packaging-imposed constraints. Coherent links, traditionally used in long-reach applications, are gaining traction as an alternative to short-reach IM-DD links. Compared to IM-DD, coherent links can deliver 4× spectral efficiency by utilizing three degrees of freedom of the optical signal (i.e., intensity, phase, and polarization states). Still, it comes at the expense of the
Ahmed E. Abdelrahman1, Mostafa G. Ahmed1,2, Mahmoud A. Khalil1,
Mohamed Badr Younis1, Kyu-Sang Park1, Pavan Kumar Hanumolu1 University of Illinois, Urbana, IL, 2now at Ain Shams University, Cairo, Egypt 1 The