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Ultrafast All-Optical Switching and Modulation Using Intersubband Transitions in Coupled Quantum Well Structures
Haruhiko YOSHIDA Takasi SIMOYAMA Achanta Venu GOPAL Jun-ichi KASAI Teruo MOZUME Hiroshi ISHIKAWA
IEICE TRANSACTIONS on Electronics
Publication Date: 2004/07/01
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Section on Ultrafast Photonics)
intersubband transition, all-optical, coupled quantum well, optical communication, Sb,
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In this report we present all-optical switches and modulators based on the intersubband transition in semiconductor quantum wells. The use of InGaAs/AlAsSb coupled double quantum well structures is proposed to facilitate intersubband transitions in the optical-communication band, and to reduce the intersubband absorption recovery time from several picoseconds to a few hundred femtoseconds by utilizing enhanced electron-phonon scattering. Subpicosecond all-optical gating and modulation in coupled double quantum wells are observed using pump-probe experiments at optical-communication wavelengths. The results indicate that the intersubband transition in this structure is very useful for ultrafast all-optical switching devices.