High-Speed and Ultra-Wideband Devices for Coherent Transmission: Challenges and Opportunities

Low cost-per-bit high symbol-rate transceivers and link capacity upgrade with ultra-wideband (UWB) amplifiers are promising enabling technologies for future cost-efficient optical networks. In this paper, we review recent progress and future developments in semiconductor optical amplifier (SOA)-based UWB repeaters to extend the transmission bandwidth up to 100 nm and high-speed CMOS digital-to-analog (DAC) converters in the generation of 100 GBd class signals.