Improved Post-compensation SSBI Mitigation Method for Single-sideband Signals

The recent development of communication, the capacity demand of a single link is increasing. Direct detection with high order modulation attracts much attention due to higher spectrum utilization efficiency and lower hardware complexity. Direct detection will suffer from signal-signal beat interference (SSBI), especially under lower carrier-signal power ratios (CSPR). However, a lower CSPR means that more optical power is allocated to desired signals. Thus, we propose an improved post-compensation method for SSBI mitigation. We investigate the influence of carrier estimation and the accuracy of SSBI estimation made by the proposed method. Besides, we compare the proposed method with other SSBI mitigation methods. The result shows the efficiency and the effectiveness of the proposed method, especially under the optimal CSPR.