Title :
Spectral characteristics of distributed feedback laser diodes with distributed coupling coefficient
Author :
Lo, B.S.K. ; Ghafouri-Shiraz, H.
Author_Institution :
Sch. of Electron. & Electr. Eng., Birmingham Univ., UK
fDate :
2/1/1995 12:00:00 AM
Abstract :
A comprehensive investigation of the spectral characteristics of distributed feedback (DPB) laser diodes (LD´s) with a distributed coupling coefficient (DCC) is presented. With a proper selection of both the coupling ratio (r) and a corrugation position (CP), the performance of the DCC laser structure is enhanced with an improved single-mode stability as well as a uniform field distribution. In the analysis, the above threshold characteristics and the influence of non-lasing side modes have been investigated using the transfer matrix method (TMM). Based on a DCC laser structure with r=1/3 and CP=0.46, a normalized gain margin (ΔαL)=0.81 and a side mode suppression ratio (SMSR) of 45 dB have been achieved for a DCC LD at biasing current of 4Ith . The introduction of the DCC laser structure opens a new way of stabilizing the single-mode oscillation in DFB LD´s
Keywords :
distributed feedback lasers; laser modes; laser stability; laser theory; matrix algebra; optical couplers; semiconductor lasers; DCC laser structure; DFB LD´s; above threshold characteristics; biasing current; corrugation position; coupling ratio; distributed coupling coefficient; distributed feedback laser diodes; improved single-mode stability; non-lasing side modes; normalized gain margin; side mode suppression ratio; single-mode oscillation; spectral characteristics; transfer matrix method; uniform field distribution; Diode lasers; Distributed feedback devices; Laser feedback; Laser modes; Laser stability; Optical coupling; Semiconductor diodes; Semiconductor lasers; Spontaneous emission; Wavelength division multiplexing;
Journal_Title :
Lightwave Technology, Journal of
