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Pseudoreversibility condition for minimizing radiation loss at discontinuities of coupled waveguides

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2 Author(s)
Ramadan, T.A. ; Nanotechnology Center, Univ. of Louisville, KY, USA ; Cohn, R.W.

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.

Published in:

Photonics Technology Letters, IEEE  (Volume:15 ,  Issue: 1 )