Modulator material impact on chirp, DSP, and performance in coherent digital links: comparison of the lithium niobate, indium phosphide, and silicon platforms

作者：Maxime Jacques, Alireza Samani, David Patel, Eslam El‐Fiky, Mohamed Morsy-Osman, Thang M. Hoang, Md. Ghulam Saber, Luhua Xu, John Sonkoly, Michael H. Ayliffe, David V. Plant · 发表于：Optics Express · 年份：2018 · DOI：10.1364/oe.26.022471 · 被引用次数：22 · 研究领域：Optical Network Technologies、Photonic and Optical Devices、Advanced Photonic Communication Systems

are found to scale with the RF signal amplitude. In simulations, using a polynomial fit over a sinusoidal fit when pre-compensating the Si modulator transfer function slightly improves EVM (-0.6%). We also show that Si-related distortions can impact the efficiency of symbol timing recovery. In conclusion, phase and attenuation distortions in InP and Si modulators deteriorate the overall performance in coherent links, and cannot be neglected for large RF signal amplitudes. These results will benefit the optical communications community.