Absorption Dynamics in All-Optical Switch Based on Intersubband Transition in InGaAs–AlAs–AlAsSb Coupled Quantum Wells

Author

Simoyama, Takasi ; Sekiguchi, Sigeaki ; Yoshida, Haruhiko ; Kasai, Jun-ichi ; Mozume, Teruo ; Ishikawa, Hiroshi

Author_Institution

Nat. Inst. of Adv. Ind. Sci. & Technol.

Volume

19

Issue

8

fYear

2007

fDate

4/15/2007 12:00:00 AM

Firstpage

604

Lastpage

606

Abstract

We developed a pigtailed fiber module including an intersubband transition all-optical switch using InGaAs-AlAs-AlAsSb coupled double quantum wells and studied the absorption saturation dynamics. An increased extinction ratio was obtained by optimizing the delay time between control and signal pulses due to the reduced effect of two-photon absorption. An extinction ratio of 10 dB was obtained for a fiber input pulse energy of 16 pJ (200-fs pulsewidth). The absorption recovery time varied from 600 fs to 2 ps depending on the control pulse energy

Keywords

III-V semiconductors; aluminium compounds; gallium arsenide; indium compounds; modules; optical saturable absorption; optical switches; quantum well devices; semiconductor quantum wells; two-photon processes; 16 pJ; 200 fs; InGaAs-AlAs-AlAsSb; InGaAs-AlAs-AlAsSb coupled quantum wells; absorption recovery time; absorption saturation; all-optical switch; extinction ratio; intersubband transition; pigtailed fiber module; two-photon absorption; Absorption; Communication switching; Delay; Extinction ratio; Indium gallium arsenide; Infrared spectra; Optical pulses; Optical scattering; Optical switches; Optical waveguides; Absorption saturation; coupled double quantum well (C-DQW); intersubband transition (ISB-T);

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2007.894353

Filename

4139646