NDLI: Effects of radiation on circular-grating DFB lasers. I. Coupled-mode equations

Content Provider	IEEE Xplore Digital Library
Author	Greene, P.L. Hall, D.G.
Copyright Year	1965
Abstract	We derive near-threshold coupled-mode equations that include the effects of radiation for TE fields in circular-grating surface-emitting distributed feedback (DFB) lasers with second-order gratings. The analysis uses an exact description of the periodic grating that is valid for any grating shape and depth. For low-order azimuthal modes, approximate equations are found that are the same as those for a linear DFB laser, though the boundary conditions differ. We solve the coupled-mode equations for a weakly guiding laser numerically for low- and higher-order radial and azimuthal modes and compare these numerical results to previous experimental observations and to the results found for linear gratings. For sufficiently strong coupling, radiative losses have a significant impact on the mode structure of the laser, breaking the radial (longitudinal) mode symmetry otherwise seen for the lowest order azimuthal modes and improving mode selectivity.
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	353
Ending Page	364
Page Count	12
File Size	329060
File Format	PDF
ISSN	00189197
Volume Number	37
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Surface emitting lasers Distributed feedback devices Laser modes Gratings Laser feedback Optical coupling Equations Near-field radiation pattern Tellurium Shape
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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