Title :
Coupling coefficients in gain-coupled DFB lasers: inherent compromise between coupling strength and loss
Author :
David, K. ; Buus, J. ; Morthier, G. ; Baets, R.
Author_Institution :
Lab. of Electromagn. & Acoust., Gent Univ., Belgium
fDate :
5/1/1991 12:00:00 AM
Abstract :
A theoretical analysis of the gain-coupling coefficient for distributed feedback (DFB) lasers with first-order, rectangular, gain, or loss gratings is presented. For the structure with gain grating, the dependence of the gain-coupling coefficient on the modal gain has been taken into account for the first time. In both structures, an inherent compromise between coupling strength and extra modal loss is found. The results show that significant gain-coupling coefficient values are feasible.<>
Keywords :
diffraction gratings; distributed feedback lasers; coupling strength; first order rectangular gratings; gain coupled distributed feedback lasers; gain grating; gain-coupling coefficient; loss gratings; modal gain; modal loss; theoretical analysis; Coatings; Frequency; Gratings; Laboratories; Laser feedback; Laser modes; Laser theory; Optical coupling; Optical device fabrication; Refractive index;
Journal_Title :
Photonics Technology Letters, IEEE
