Title :
Lateral-mode discrimination in ridge waveguides by misaligned total internal reflection mirrors
Author :
Han, H. ; Coleman, J.J.
Author_Institution :
Microelectron. Lab., Illinois Univ., Urbana, IL, USA
fDate :
7/1/1995 12:00:00 AM
Abstract :
Lateral-mode discrimination by misaligned total internal reflection (TIR) mirrors in multimode ridge waveguide structures is proposed. The effects of angular misalignment in TIR mirrors and index steps in ridge waveguides on the modal reflectivity is analyzed by a plane wave expansion method. The modal reflectivity of a high order mode decreases more rapidly than that of a fundamental mode as the angular misalignment of TIR mirrors increases. It is found that a fundamental mode can have high modal reflectivity (/spl sim/0.9) with significant lateral-mode discrimination over high-order modes if the ridge waveguides have large index steps.<>
Keywords :
mirrors; optical waveguide theory; reflectivity; ridge waveguides; angular misalignment; fundamental mode; high-order modes; index steps; lateral-mode discrimination; modal reflectivity; multimode ridge waveguides; plane wave expansion; total internal reflection mirrors; Laser modes; Laser transitions; Mirrors; Optical reflection; Planar waveguides; Reflectivity; Ring lasers; Semiconductor lasers; Semiconductor waveguides; Waveguide lasers;
Journal_Title :
Photonics Technology Letters, IEEE
