Novel Design of Optical Power Distributor of Three-Guide GADCs using Modal Transmission-Line Theory
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Newly developed modal transmission-line theory (MTLT) is derived to analyze rigorously the optical power distribution in grating-assisted directional couplers (GADCs) with three guiding channels. By defining a novel coupling efficiency η amenable to the rigorous analytical solutions of modal transmission-line theory, we explicitly evaluate the power coupling and distribution of TE modes. The results reveal that the incident power is sensitively partitioned through three output channels in terms of such grating parameters as the periodicity and height of grating embedded in the center guide.
Abstract
Newly developed modal transmission-line theory (MTLT) is derived to analyze rigorously the optical power distribution in grating-assisted directional couplers (GADCs) with three guiding channels. By defining a novel coupling efficiency η amenable to the rigorous analytical solutions of modal transmission-line theory, we explicitly evaluate the power coupling and distribution of TE modes. The results reveal that the incident power is sensitively partitioned through three output channels in terms of such grating parameters as the periodicity and height of grating embedded in the center guide.