J. A. Arnaud
Bell System Technical Journal, The (Volume:53 , Issue: 2 ), pages 217 – 224, Feb. 1974
Two perturbation formulas have been proposed to evaluate the coupling between parallel optical waveguides, one involving a line integral and the other a surface integral. They are shown to be identical. The former expression is preferred because of its greater simplicity. The case of two parallel lossy dielectric slabs is discussed as an example.
LIEN VERS L’ARTICLE : TRANSVERSE COUPLING IN FIBER OPTICS PART I : COUPLING BETWEEN TRAPPED MODES