Title :
Effect of external reflectors on radiation profile of grating coupled surface emitting lasers
Author :
Yu, S.F. ; Zhang, L.M. ; Plumb, R.G.S. ; Carroll, J.E.
Author_Institution :
Dept. of Eng., Cambridge Univ., UK
fDate :
2/1/1993 12:00:00 AM
Abstract :
Grating coupled surface emitting distributed feedback lasers are analysed by the authors´ recently developed model. The model takes into account spontaneous emission, the longitudinal variation of carrier concentration and that of photon density, calculated by a self-consistent technique. The emission spectrum and near and far field radiation patterns are determined as a function of the injection current and external optical feedback. It is found that a single lobed far field radiation pattern is favoured by asymmetric coating of the facets. In addition, the phase margin to achieve a single lobed radiation profile can be increased by increasing the amplitude of the reflection
Keywords :
diffraction gratings; distributed feedback lasers; laser theory; optical couplers; semiconductor device models; semiconductor lasers; asymmetric coating; carrier concentration; diode laser model; distributed feedback lasers; emission spectrum; external optical feedback; external reflectors; facet coating; grating coupled surface emitting lasers; injection current; laser accessories; longitudinal variation; near field radiation patterns; photon density; radiation profile; reflection amplitude; reflectivity; self-consistent technique; single lobed far field radiation pattern; single lobed radiation profile; spontaneous emission;
Journal_Title :
Optoelectronics, IEE Proceedings J
