Title :
Stabilization of the longitudinal mode against spatial hole burning in lambda /4-shifted DFB lasers by quantum size effect
Author :
Aoki, M. ; Uomi, K. ; Tsuchiya, T. ; Sasaki, S. ; Chinone, N.
Author_Institution :
Hitachi Ltd., Tokyo, Japan
Abstract :
A novel method for stabilizing the spectral properties of lambda /4-shifted distributed-feedback (DFB) lasers against the longitudinal spatial hole burning by using the quantum size effect in MQW structures is proposed and demonstrated experimentally and theoretically. The effect of the longitudinal spatial hole burning on the spectral behavior is shown to be determined by the alpha parameter, not by the differential index or by the optical confinement in the active layer. The reduction of the alpha parameter is found to be very effective in suppressing the spectral instabilities induced by the longitudinal spatial hole burning.<>
Keywords :
distributed feedback lasers; laser modes; optical hole burning; semiconductor junction lasers; MQW structures; active layer; alpha parameter; distributed-feedback; hole burning; lambda /4-shifted DFB lasers; longitudinal mode; longitudinal spatial hole burning; quantum size effect; semiconductor lasers; spectral behavior; spectral instabilities; High speed optical techniques; Indium gallium arsenide; Laser modes; Laser stability; Laser theory; Optical films; Power generation; Quantum mechanics; Quantum well devices; Wavelength measurement;
Journal_Title :
Photonics Technology Letters, IEEE
