The implementation of 40 Gbit/s optical communication systems places increasing pressure on the development of the optoelectronic devices used to drive, amplify, modulate and receive optical signals. This title brings together contributions from leading figures in their respective fields, reviewing the state-of-the-art in the enabling technologies behind high speed telecommunication systems. Separate chapters are devoted to the wide variety of modulators in use and in development, high speed lasers, photodetectors, photoreceivers and optical amplifiers. The final chapter considers integrated circuit technology for possible future lightwave communication systems, and the book concludes with a summary from the editor indicating future trends within the industry.