An SOI based polarization insensitive filter for all-optical clock recovery

作者:Zou, Jinghui; Yu, Yu; Yang, Weili; Wu, Zhao; Ye, Mengyuan; Chen, Guanyu; Liu, Lei; Deng, Shupeng; Zhang, Xinliang*
来源:Optics Express, 2014, 22(6): 6647-6660.
DOI:10.1364/OE.22.006647

摘要

We fabricate and demonstrate a compact polarization insensitive filter for all-optical clock recovery (CR) based on silicon-on-insulator (SOI), which consists of a microring resonator (MRR) and two modified two-dimensional (2D) grating couplers. The distributed Bragg reflectors (DBRs) are introduced to improve the coupling efficiency of the 2D grating coupler. The MRR works as a comb filter for CR, while the 2D grating couplers serve as the polarization diversity unit to achieve a polarization insensitive operation. A subsequent semiconductor optical amplifier (SOA) performs the amplitude equalization. Based on this scheme, a good clock signal with 970 fs timing jitter can be achieved at 44 Gb/s from input signals with arbitrary polarization states.