HIGH-SPEED OPTICAL RECEIVER WITH SOFT DECISION ISI CANCELLATION

Due to the stimulating success in developing optical amplifiers, inter symbol interference (ISI) will become the dominant limit on both bit r ate and transmission distance in long-haul optical fiber communication systems. Here we present a receiver with ''Soft Decision ISI Cancella tion'' (SDIC) to deal with ISI in high-speed lightwave systems. The an alytical and simulation results show that the transmission distance ca n be doubled with SDIC. In addition, the receiver with SDIC allows the ISI cancellation circuit operating with processing and propagation de lay much longer than 1-b period. Therefore, it is very promising in ve ry high bit rate optical systems.