Conference Proceedings
Hybrid frequency-time domain Tx and Rx I/Q imbalance compensation for coherent optical OFDM transmission
S Chen, AA Amin, W Shieh
Optics InfoBase Conference Papers | SPIE-INT SOC OPTICAL ENGINEERING | Published : 2010
DOI: 10.1117/12.888150
Abstract
A compensation scheme for transmitter (Tx) and receiver (Rx) I/Q imbalance with the interference of carrier frequency offset for CO-OFDM transmission is demonstrated. It has low over-head using only two specific designed symbols for Rx side I/Q imbalance and two for that of Tx side, respectively. Rx compensation is performed in time domain after OFDM frame synchronization and the Tx I/Q imbalance is compensated in frequency domain after channel and phase estimation. The bit error rate (BER) and Q improvement are evaluated experimentally to demonstrate the effectiveness of compensation algorithms. This scheme performs better with the increase of OSNR. © 2011 SPIE-OSA-IEEE.