By Topic

Cross-orthogonality between guided and radiation modes at optical waveguide discontinuities

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
Ramadan, T.A. ; Electron. & Electr. Commun. Eng. Dept., Ain Shams Univ., Cairo, Egypt

The possibility of designing lossless discontinuities of optical waveguides is investigated by finding solutions that satisfy time reversibility of guided modes. It is found that these junctions are only possible for the TE modes. The use of the design condition for these junctions as a bound allows minimizing radiation loss. The results show that it is possible to minimize radiation loss under strong mode-coupling conditions. Two previously unreported designs are shown to significantly reduce radiation loss in grating couplers. The first design uses two coherently coupled gratings, instead of a single grating, for a 2 × 2 grating-assisted backward coupler. The second design uses an index-modulated buffer layer between the core and substrate of an index-modulation-grating coupler.

Published in:

Lightwave Technology, Journal of  (Volume:21 ,  Issue: 5 )