Title :
DFB laser with nonuniform coupling coefficient realized by double-layer buried grating
Author :
Nilsson, S. ; Kjellberg, T. ; Klinga, T. ; Wallin, Johan ; Streubel, K. ; Schatz, Richard
Author_Institution :
Swedish Inst. of Microelectron., Kista, Sweden
Abstract :
A technique for the realization of a nonuniform grating coupling coefficient kappa , and its implementation in distributed-feedback (DFB) lasers is presented. This technique, which is an extension of the buried-grating concept, offers precise control of the coupling coefficient and enables a kappa -ratio greater than 10. DFB lasers with an asymmetric kappa -variation have been fabricated using this method. A front-to-rear facet output power ratio close to five was obtained, qualitatively in agreement with simulations.<>
Keywords :
diffraction gratings; distributed feedback lasers; optical couplers; semiconductor lasers; DFB laser; asymmetric kappa variation; distributed-feedback; double-layer buried grating; front-to-rear facet output power ratio; grating coupling coefficient; laser diodes; nonuniform coupling coefficient; Diode lasers; Electrons; Gratings; Laser modes; Optical coupling; Quantum well lasers; Semiconductor lasers; Superlattices; Surface reconstruction; Waveguide lasers;
Journal_Title :
Photonics Technology Letters, IEEE
