Title :
Theoretical investigation on semiconductor lasers with passive waveguides
Author :
Yen, Shun Tung ; Lee, Chien-Ping
Author_Institution :
Dept. of Electron. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
fDate :
1/1/1996 12:00:00 AM
Abstract :
Semiconductor lasers with vertically integrated passive waveguides are theoretically studied using the coupled mode theory and exact calculation. Formulas for the threshold current density and the far-field patterns are derived. The physical concepts of the modulation of the beam divergence by passive waveguides are given. The exact calculated results show that the beam divergence can be greatly improved by paying a price of only a slight increase of the threshold current density. The operation mode selection is discussed. Attention is also paid to the appearance of side lobes for very narrow far-field patterns. Discussions are given for device design
Keywords :
current density; integrated optics; laser modes; laser theory; optical couplers; optical modulation; semiconductor lasers; waveguide lasers; beam divergence modulation; coupled mode theory; device design; exact calculation; far-field patterns; operation mode selection; semiconductor lasers; side lobes; threshold current density; vertically integrated passive waveguides; very narrow far-field patterns; waveguide lasers; Laser beams; Laser modes; Laser theory; Optical coupling; Optical modulation; Semiconductor lasers; Semiconductor waveguides; Threshold current; Waveguide lasers; Waveguide theory;
Journal_Title :
Quantum Electronics, IEEE Journal of
