Patent ID: 7239779
Filing Date: 2007-07-03
Classification: G02B

Abstract:
1. An optical via comprising: (a) a first waveguide in a first planar layer, said first waveguide having a first refractive index value, an input end and an output end, and supporting an optical mode with a first effective index value, (b) a second waveguide in a second planar layer, said second waveguide having a second refractive index value, an input end and an output end, and supporting a second optical mode with a second effective index value, (c) said first mode of first waveguide and said second mode of second waveguide evanescently interacting over an interaction length, (d) means for adjusting the magnitude of said mode-to-mode evanescent interaction, adjusting a detuning between said effective indexes of said first and second modes, and adjusting said interaction length, and (e) where said means for adjusting the magnitude of mode-to-mode evanescent interaction includes diminishing an interaction strength at the input end of the second waveguide, and diminishing the interaction strength at the output end of first waveguide, in such a way as to effect broadband and substantially complete optical power transfer from said input end of the first waveguide to said output end of the second waveguide.