Bsk. Lo et H. Ghafourishiraz, SPECTRAL CHARACTERISTICS OF DISTRIBUTED-FEEDBACK LASER-DIODES WITH DISTRIBUTED COUPLING COEFFICIENT, Journal of lightwave technology, 13(2), 1995, pp. 200-212
A comprehensive investigation of the spectral characteristics of distr
ibuted feedback (DFB) laser diodes (LD's) with a distributed coupling
coefficient (DCC) is presented, With a proper selection of both the co
upling ratio (tau) and a corrugation position (CP), the performance of
the DCC laser structure is enhanced with an improved single-mode stab
ility as well as a uniform field distribution. In the analysis, the ab
ove threshold characteristics and the influence of non-lasing side mod
es have been investigated using the transfer matrix method (TMM). Base
d on a DCC laser structure with tau = 1/3 and CP = 0.46, a normalized
gain margin (Delta alpha L) = 0.81 and a side mode suppression ratio (
SMSR) of 45 dB have been achieved for a DCC LD at biasing current of 4
I(th). The introduction of the DCC laser structure opens a new way of
stabilizing the single-mode oscillation in DFB LD's.