An apparatus and associated method for controlling the propagation constant of a region of focusing propagation constant in an optical waveguide. The method comprising positioning an electrode of a prescribed electrode shape proximate the waveguide. A region of focusing propagation constant is projected into the waveguides that corresponds, in shape, to the prescribed electrode shape by applying a voltage to the shaped electrode. The propagation constant of the region of focusing propagation constant is controlled by varying the voltage. Light of certain wavelengths passing through the region of focusing propagation constant has a variable focal length.

 
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> METHOD OF IMPLEMENTING THE KERR EFFECT IN AN INTEGRATED RING RESONATOR (THE KERR INTEGRATED OPTICAL RING FILTER) TO ACHIEVE ALL-OPTICAL WAVELENGTH SWITCHING, AS WELL AS ALL-OPTICAL TUNABLE FILTERING, ADD-AND -DROP MULTIPLEXING, SPACE SWITCHING AND OPTICAL INTENSITY MODULATION
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