The optimum condition for achieving highly efficient ultrafast all-optical pulse modulation by modification of the absorption of a pulsed interband light field by ultrasubband control-light pulses in a doped quantum well is investigated. The modulation efficiency in the femtosecond domain can be maximized by an intersubband control light with a pulse width (200 fs) that is comparable with the phase-relaxation time of the system and an intensity that is close to the intersubband saturation intensity.
© 1998 Optical Society of America
(060.4080) Fiber optics and optical communications : Modulation
(130.5990) Integrated optics : Semiconductors
(230.5590) Optical devices : Quantum-well, -wire and -dot devices
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
(320.7120) Ultrafast optics : Ultrafast phenomena
A. Neogi, O. Wada, Y. Takahashi, and H. Kawaguchi, "Ultrashort-pulse-controlled all-optical modulation by interband and intersubband transitions in doped quantum wells," Opt. Lett. 23, 1212-1214 (1998)