Patent ID: 9217830
Filing Date: 2015-12-22
Classification: G02B,G02F,Y02P

Abstract:
1. An electro-optic structure comprising: an intrinsic semiconductor material ring waveguide and an optically coupled strip waveguide that define an optical coupling location and are located at least in part contiguous with and extending from a semiconductor material layer located over a substrate; a first doped region comprising a first dopant type located within at least a portion of the semiconductor material layer within the intrinsic semiconductor material ring waveguide; and a second doped region comprising a second dopant type different than the first dopant type and located within at least a portion of the semiconductor material layer outside the ring waveguide on one side of the strip waveguide and opposite the optical coupling location on an opposite side of the intrinsic semiconductor material strip waveguide, wherein the first doped region and the second doped region are electrically biased as electrodes at an optimal charge injection point so that a resulting PIN diode electro-optic device with the ring waveguide and the optical coupling region as an intrinsic region is configured to operate at a swing voltage less than about 500 millivolts; and wherein the optimal charge injection point corresponds to a maximum of a charge carrier injection efficiency determined, as a function of the PIN diode bias voltage V, using the equation: where Q is an injected carrier density, Q