Title :
Highly efficient single longitudinal-mode oscillation capability of gain-coupled distributed feedback semiconductor lasers-advantage of asymmetric facet coating
Author :
Nakano, Yoshiaki ; Ushida, Yuki ; Tada, Kunio
Author_Institution :
Dept. of Electron. Eng., Tokyo Univ., Japan
fDate :
4/1/1992 12:00:00 AM
Abstract :
The gain-coupled (GC) distributed feedback (DFB) laser is found to possess an uncommon and useful feature; unlike the quarter-wave phase-shifted (index-coupled) DFB laser, it is possible to enhance single-facet power extraction efficiency by applying an asymmetric antireflection-high-reflection (AR-HR) coating without demolishing its intrinsic single-mode property. A 1-90% coating gives more than 92% of output power from one of the facets while preserving Delta gL, the difference between the lowest and second lowest normalized threshold gains, larger than 0.2 in 90% of the devices.<>
Keywords :
antireflection coatings; distributed feedback lasers; laser modes; laser theory; optical films; semiconductor junction lasers; DFB laser; asymmetric antireflection-high-reflection coating; asymmetric facet coating; diode lasers; gain-coupled distributed feedback semiconductor lasers; intrinsic single-mode property; normalized threshold gains; output power; single longitudinal-mode oscillation; single-facet power extraction efficiency; stochastic analysis; Coatings; Distributed feedback devices; Laser feedback; Laser modes; Optical reflection; Partial differential equations; Power generation; Power lasers; Semiconductor lasers; Stochastic processes;
Journal_Title :
Photonics Technology Letters, IEEE
