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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1991),
  • paper CThR36

Design optimization of phase modulators based on generalized reservoir-and-quantum-well electron-transfer structures

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Abstract

Multiple quantum-well (QW) phase modulators based on band filling effect have recently been demonstrated to be much superior to those based on the quantum confined Stark effect. In particular, waveguides incorporating the periodic blockaded reservoir-and-quantum-well electron-transfer structure (BRAQWETS) exhibit not only low-voltage-length products for π phase shift (0.35 V-cm) with essentially linear phase change with voltage and very low absorption loss and associated electroabsorption, but also high-response speed owing to the absence of holes in the structure.1–3 In this paper we first establish several figures of merit for BRAQWETS modulators generalized to allow multiple QWs per period. Guidelines for layer optimization of prototype BRAQWETS are elucidated with the help of an equivalent circuit model involving the concepts of transcapacitance and quantum capacitance. Benefits of using additional quantum wells in each period are then evaluated by self-consistent numerical simulation. Finally, figures of merit are tabulated for a range of practical designs, including a novel three-terminal symmetric configuration, and the guide-lines for using the table are given.

© 1991 Optical Society of America

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