Title :
Spectral linewidth of DFB lasers including the effects of spatial holeburning and nonuniform current injection
Author :
Pan, X. ; Olesen, H. ; Tromborg, B.
Author_Institution :
TFL Telecommun. Res. Lab., Horsholm, Denmark
fDate :
5/1/1990 12:00:00 AM
Abstract :
An analytic expression for the linewidth of distributed-feedback (DFB) lasers is derived. Local fluctuations in carrier density are shown to provide a significant contribution to laser linewidth in the presence of spatial holeburning. In a single-electrode DFB laser the effect can be avoided by careful optimization of the kl-product, but for a multielectrode DFB laser the linewidth can also be reduced by adjusting the injected current profile to compensate for spatial holeburning. Numerical results for a three-electrode lambda /4-shifted DFB laser are presented.<>
Keywords :
carrier density; distributed feedback lasers; fluctuations; optical hole burning; semiconductor junction lasers; spectral line breadth; DFB lasers; carrier density; fluctuations; injected current profile; kl-product; lambda /4-shifted DFB laser; laser linewidth; multielectrode DFB laser; nonuniform current injection; single-electrode DFB laser; spatial holeburning; spectral linewidth; Bandwidth; Charge carrier density; Distributed Bragg reflectors; Electrodes; Fluctuations; Laser modes; Laser noise; Laser theory; Optical device fabrication; Reflectivity;
Journal_Title :
Photonics Technology Letters, IEEE
