Title :
Analysis of TE and TM modes in DFB lasers by two-dimensional theory
Author :
Hori, Yoshikazu ; Sato, Hisanao
Author_Institution :
Matsushita Electr. Ind. Co. Ltd., Osaka, Japan
fDate :
7/1/1991 12:00:00 AM
Abstract :
The two-dimensional theory of a distributed feedback (DFB) laser (which was previously presented and applied to the analysis of the laser threshold conditions for the transverse-electric (TE) mode in a simple three-layer waveguide structure) is developed to treat both TE and transverse-magnetic (TM) modes in a four-layer waveguide structure with a thin grating layer, which more closely reflects actual DFB laser structure. The differences between TE and TM modes for the dispersion relations and the laser threshold conditions are clarified. The effects of the waveguide structure (including grating layer thickness, refractive indexes of layers, coupling constant, and corrugation period) on the threshold gains and the gain differences between the two longitudinal modes on both sides of the Bragg frequencies are studied in detail for both TE and TM modes
Keywords :
distributed feedback lasers; laser modes; laser theory; Bragg frequencies; corrugation period; coupling constant; dispersion relations; distributed feedback lasers; four-layer waveguide structure; gain differences; grating layer thickness; laser threshold conditions; longitudinal modes; refractive indexes; thin grating layer; threshold gains; transverse electric mode; transverse magnetic modes; two-dimensional theory; Bragg gratings; Dispersion; Distributed feedback devices; Laser feedback; Laser modes; Laser theory; Refractive index; Tellurium; Waveguide lasers; Waveguide theory;
Journal_Title :
Quantum Electronics, IEEE Journal of
