Title :
Bidirectional eigenmode propagation for large refractive index steps
Author :
Sztefka, G. ; Nolting, H.P.
Author_Institution :
Heinrich Hertz Inst. fuer Nachrichtentech., Berlin, Germany
fDate :
5/1/1993 12:00:00 AM
Abstract :
The bidirectional eigenmode propagation (BEP) combines the advantages of the transfer-matrix method for propagation and the mode-matching method (satisfying Maxwell´s boundary conditions) at longitudinal large discontinuities for forward and backward travelling eigenvalues including discretized radiation modes. The calculated examples include a grating-assisted codirectional coupler for which 20% radiation losses have been found, and a cleaved waveguide facet with 39% reflected intensity and recapture of radiation modes due to a taperlike structure. The BEP is applicable to various types of optical passive (directional coupler, butt-coupling, taper) and active (DBR-, DFB-, and VCSE-laser, detector) devices with large refractive index differences.<>
Keywords :
diffraction gratings; directional couplers; eigenvalues and eigenfunctions; integrated optics; optical couplers; optical losses; optical waveguide theory; refractive index; DBR lasers; DFB lasers; Maxwell´s boundary conditions; VCSE-laser; active laser devices; backward travelling eigenvalues; bidirectional eigenmode propagation; butt-coupling; cleaved waveguide facet; directional coupler; discretized radiation modes; forward travelling eigenvalues; grating-assisted codirectional coupler; integrated optics; large refractive index differences; large refractive index steps; laser diodes; longitudinal large discontinuities; mode-matching method; photodetectors; radiation losses; reflected intensity; taper; taperlike structure; transfer-matrix method; Boundary conditions; Eigenvalues and eigenfunctions; Face detection; Gratings; Mode matching methods; Optical devices; Optical losses; Optical refraction; Optical waveguides; Refractive index;
Journal_Title :
Photonics Technology Letters, IEEE
