Optical Waveguide Power Divider.
DEPARTMENT OF THE NAVY WASHINGTON D C
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This patent describes an optical waveguide power divider which uses a two-dimensional slab waveguide. An input confined to one arm propagates to a point where synchronism between two closely adjacent guides is abruptly introduced by introducing an overlay with a fast taper. The coupled guides are here sufficiently synchronous and close together that the symmetrical and asymmetrical normal modes of the coupled structure will be excited, each with 12 of the input power. Synchronism is then slowly removed by tapering the overlay to zero so that mode a selects arm no. 1 while mode b selects arm no. 2. These latter changes are adiabatic, i.e., slow enough after synchronism has been removed, the two arms may be spatially separated to split the power into two directions. Author
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