Pseudoreversibility condition for minimizing radiation loss at discontinuities of coupled waveguides

Author

Ramadan, Tarek A. ; Cohn, Robert W.

Author_Institution

Nanotechnology Center, Univ. of Louisville, KY, USA

Volume

15

Issue

1

fYear

2003

Firstpage

63

Lastpage

65

Abstract

A design condition is derived for lossless discontinuities of coupled waveguides by finding solutions, which satisfy time reversibility of guided modes. The derived condition is used as a bound for minimizing radiation loss. Even when there is strong coupling between guided modes, the radiation loss can be minimal. A comparison between different grating designs in a 2 /spl times/ 2 backward coupler demonstrates that two coherently coupled gratings can significantly reduce radiation loss, as compared to a single grating.

Keywords

diffraction gratings; integrated optics; optical couplers; optical design techniques; optical losses; optical waveguide theory; backward coupler; coupled gratings; coupled waveguide discontinuities; design condition; grating designs; guided modes; integrated optics; lossless discontinuities; pseudoreversibility condition; radiation loss; strong coupling; Gratings; Nanotechnology; Optical coupling; Optical losses; Optical scattering; Optical waveguides; Particle scattering; Reflection; Transmission line matrix methods; Waveguide discontinuities;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2002.805763

Filename

1159063