Title :
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.
fDate :
4/15/2007 12:00:00 AM
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);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.894353
