Title :
Influence of optical feedback-induced phase on turn-on dynamics of vertical-cavity surface-emitting semiconductor lasers
Author :
Mahmoud, Safwat W Z ; Ahmed, Moustafa F. ; Michalzik, Rainer
Author_Institution :
Dept. of Phys., Minia Univ., El-Minia, Egypt
Abstract :
We report on experimental and theoretical study of the influence of optical feedback-induced phase change on both the coupled optical power from GaAs based VCSEL into a multimode fiber under continuous wave operation and the turn-on dynamics under current modulation. A standing-wave interference pattern of laser light between the fiber facet and the VCSEL top mirror generates external optical feedback to the VCSEL, The phase variation of the feedback light changes the threshold gain periodically with a half-wavelength period. When the fiber is located at maxima and minima of this pattern, it causes a change of 50 μA in the threshold current under continuous wave (CW) operation. Thin change of threshold current induces a change in the turn-on delay time by 50 ps under bias-free pulsed operation.
Keywords :
gallium arsenide; laser feedback; semiconductor lasers; surface emitting lasers; bias-free pulsed operation; continuous wave; coupled optical power; current modulation; feedback light; feedback-induced phase change; laser light; multimode fiber; standing-wave interference pattern; vertical-cavity surface-emitting semiconductor lasers; Fiber lasers; Laser feedback; Laser theory; Optical feedback; Optical modulation; Optical surface waves; Semiconductor lasers; Surface emitting lasers; Threshold current; Vertical cavity surface emitting lasers;
Conference_Titel :
Circuits and Systems, 2003 IEEE 46th Midwest Symposium on
Print_ISBN :
0-7803-8294-3
DOI :
10.1109/MWSCAS.2003.1562546