Asymmetric direct detection of twin-SSB signals

作者：Xueyang Li, Mingyue Zhu, Zhenping Xing, Maurice O’Sullivan, David V. Plant · 发表于：Optics Letters · 年份：2020 · DOI：10.1364/ol.383029 · 被引用次数：14 · 研究领域：Optical Network Technologies、Advanced Photonic Communication Systems、Semiconductor Lasers and Optical Devices

We propose the asymmetric direct detection (ADD) of twin-single sideband (SSB) signals based on a simple receiver front-end composed of one optical filter and two photodiodes. ADD exploits the photocurrent difference between a filtered and unfiltered signal pair to reconstruct and linearize the received twin-SSB signal with a high electrical spectral efficiency (ESE). We evaluate the performance impact of the critical system parameters on ADD and demonstrate 231 Gb/s net rate 16-QAM twin-SSB transmission with 6.03 b/s/Hz ESE over an 80 km standard single-mode fiber below the 1 × 10 − 2 hard-decision forward error correction threshold. We also found that the bit error rate performance of ADD is robust against the relative center wavelength drifting of the optical filter.