Design and Parallel Implementation of an Adaptive Baseline Wander Compensator for High-Speed Optical Coherent Receivers
ISCAS(2011)
Abstract
Baseline wander (BLW) is caused by transmission zeros at DC in the frequency response of the communication channel [1]. One of its common sources is a high-pass filter used to AC-couple the received signal. Numerous BLW compensation (BLWC) schemes for baseband and homodyne communication systems have been proposed in past literature. However, a preferred architecture in modern coherent optical communications is the intradyne receiver, because it avoids complex optical phase locked loops. As a result of the carrier frequency offset experienced at the input of intradyne coherent receivers, existing BLWC techniques are not sufficient.In this work we propose an adaptive parallel-processing BLW compensation architecture for high-speed coherent intradyne fiber optic receivers. Parallel processing for the BLWC implementation is imposed by the high data rate required in current optical applications. The new compensator estimates the BLW interference based on both the detected symbols and the carrier frequency offset provided by the carrier recovery loop. Numerical results demonstrate the effectiveness of the proposed technique to mitigate BLW effects.
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Key words
coherence,frequency response,high-pass filters,optical communication,optical receivers,AC-couple,BLW effect,BLW interference,adaptive baseline wander compensator,adaptive parallel-processing BLW compensation architecture,baseband,carrier frequency offset,carrier recovery loop,communication channel,complex optical phase locked loop,frequency response,high-pass filter,high-speed coherent intradyne fiber optic receiver,high-speed optical coherent receiver,homodyne communication system,intradyne receiver,modern coherent optical communication,parallel processing,transmission zero
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