Title :
Yield analysis of SLM DFB lasers with an axially-flattened internal field
Author :
Kinoshita, Jun-Ichi ; Matsumoto, Kenji
Author_Institution :
Toshiba Corp., Yokohama, Japan
fDate :
6/1/1989 12:00:00 AM
Abstract :
The results of the yield analysis of distributed-feedback (DFB) lasers which can operate in a single longitudinal model (SLM) are presented. A DFB structure with two λ/8 phase-shifters is analyzed, together with conventional structures with no shifters and a single shifter. The SLM yield is defined such that the lasers satisfy the criteria of both normalized threshold gain difference (ΔαL) and a flatness factor of the internal field profile along the cavity direction. Flattening the field profile is indispensable to minimize the effect of spatial hold-burning. The SLM behaviour of the double λ/8 shift DFB lasers with ideally zero reflectivity facets is also analyzed as a parameter of the distance between the shifters (ΔL)
Keywords :
distributed feedback lasers; laser modes; laser theory; semiconductor junction lasers; λ/8 phase-shifters; DFB lasers; axially-flattened internal field; flatness factor; normalized threshold gain difference; single longitudinal model; spatial hold-burning; yield analysis; zero reflectivity facets; Distributed feedback devices; Equations; Fiber lasers; Laser feedback; Laser modes; Laser stability; Laser theory; Optical fibers; Phase shifters; Reflectivity;
Journal_Title :
Quantum Electronics, IEEE Journal of
