The introduction of GaAs/AlGaAs double heterostructure lasers marks a new era in the application of compound semiconductor materials to microwave and optical technologies. A variety of semiconductor materials and combinations have been investigated and applied to present commercial uses, with the devices operating at wide frequencies and wavelengths. Semiconductor modulators are typical examples of this technical evolution and have been developed for commercial use, but to date there has been no book that deals with the long history of this evolution. Semiconductor Optical Modulators is the first book to provide a comprehensive account of semiconductor modulators with historical details and experimental reports. Particular attention has been paid to multiple quantum well (MQW) modulators operating at long wavelengths, taking into account the low losses and dispersion in silica fibers occurring at around 1.3 and 1.55 mm. Semiconductor Optical Modulators will prove to be an indispensable reference for both academics and researchers active in this quickly evolving field. Graduate students will also find this text an accessible introduction.