We describe recent advances in the development of 1550-nm symmetric self-electrooptic effect devices (S-SEEDs). S-SEEDs are semiconductor optoelectronic devices used to implement ultrafast all-optical logic functions for optical fiber communication applications. In this paper, basic S-SEED operation is described, followed by a detailed explanation of the optimization techniques used to improve DC and high-speed performance in these long wavelength devices. Both epitaxial strain and quantum well design are shown to be important for S-SEEDs grown in the InAlGaAs quaternary material system. The device fabrication approach is outlined, and DC electrical and optical performance is discussed. Finally, we describe the high-speed optoelectronic measurements used to determine S-SEED switching characteristics. The devices described herein are the first known S-SEEDs to operate at telecommunications-compatible wavelengths and demonstrate record switching speeds with rail-to-rail switching rates faster than 6 picoseconds.
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