Design Characteristics of Planar Grating - Assisted Directional Couplers in Optical Communication -
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Rigorous transmission-line modal description is derived for the first time to analyze maximum power transfer in grating-assisted directional couplers. By defining a coupling efficiency η amenable to rigorous analytical solutions and interference between even and odd modes, we evaluate the power exchange of TE modes as a function of propagation distance z. The result reveals that maximum power transfer occurs at a grating period Λmin, which is generally different from phase-matching condition Λph.
Abstract
Rigorous transmission-line modal description is derived for the first time to analyze maximum power transfer in grating-assisted directional couplers. By defining a coupling efficiency η amenable to rigorous analytical solutions and interference between even and odd modes, we evaluate the power exchange of TE modes as a function of propagation distance z. The result reveals that maximum power transfer occurs at a grating period Λmin, which is generally different from phase-matching condition Λph.