Ultra-High Speed Optical Signal Transmission: Single Channel 40 Gbit/s. 80 Gbit/s and 160 Gbit/s

In this paper we review recent results on long-haul ultra-high speed single-channel optical signal transmission. We have demonstrated pseudo-linear transmission of a 40-Gbit/s return-to-zero (RZ) signal over 2000 km of nonzero dispersion fiber with terrestrial span length (100 km) and without forward error correction (FEC). In addition, we show 80-Gbit/s transmission over 1200 km using time and polarization multiplexing. Experiment of 160-Gbit/s transmission over 400 km is presented, including its semiconductor based transmitter, demultiplexer and clock recovery. We also report a recent record ultra-long-haul transmission of 40 Gbit/s over 1,000,000 kilometers using in-line optical regeneration. This record-breaking result is achieved by using a novel fiber 2R (re-amplifying and re-shaping) regenerator and an in-line synchronous modulator.