Open AccessUnidirectional complex gratings assisted couplers
Author(s) -
M. Greenberg,
Meir Orenstein
Publication year - 2004
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.12.004013
Subject(s) - optics , refractive index , waveguide , coupled mode theory , realization (probability) , modulation (music) , grating , transmission (telecommunications) , coupling (piping) , inverse , physics , diffraction grating , materials science , computer science , telecommunications , acoustics , metallurgy , statistics , mathematics , geometry
We present a novel concept which enables the realization of unidirectional and irreversible grating assisted couplers by using gain-loss modulated medium to eliminate the reversibility. Employing a matched periodic modulation of both refractive index and loss (gain) we achieve a unidirectional energy transfer between the modes of the coupler which translates to light transmission from one waveguide to another while disabling the inverse transmission. The importance of self coupling coefficients is explored as well and a feasible implementation, where the real and imaginary perturbations are implemented in different waveguides is presented.