Title :
Two-dimensional theory of distributed feedback semiconductor lasers
Author :
Sato, Hisanao ; Hori, Yoshikazu
Author_Institution :
Matsushita Electr. Ind. Co. Ltd., Osaka, Japan
fDate :
3/1/1990 12:00:00 AM
Abstract :
A theory which takes account of the two dimensional waveguide structure of the distributed-feedback (DFB) laser is presented. Laser threshold conditions in the case of no external reflections are calculated for a three-layer model in which one cladding layer has a periodically changing dielectric constant. In contrast with the coupled-wave theory the threshold conditions are found to be asymmetric with respect to the Bragg frequency. The longitudinal mode which lies below and nearest the Bragg frequency has the lowest threshold gain. The difference between the threshold gains of the two adjacent longitudinal modes straddling the Bragg frequency has a maximum as a function of the coupled strength of the grating
Keywords :
claddings; distributed feedback lasers; laser modes; optical waveguides; permittivity; semiconductor device models; semiconductor junction lasers; 2D semiconductor laser theory; 2D waveguide structure; Bragg frequency; cladding layer; distributed feedback semiconductor lasers; grating coupling strength; lasing threshold; longitudinal mode; periodically changing dielectric constant; three-layer model; threshold gain; Distributed feedback devices; Frequency; Laser feedback; Laser modes; Laser theory; Optical reflection; Semiconductor lasers; Semiconductor waveguides; Waveguide lasers; Waveguide theory;
Journal_Title :
Quantum Electronics, IEEE Journal of
