Optical modulator and optical modulator array

Details Optical modulator and optical modulator array Optical modulator and optical modulator array

1997-01-03

1999-06-01

Epps, Georgia

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359245, 359247, 359260, 359322, G02F 103, G02F 1015

Patent

active

059093030

ABSTRACT:
A reversible and conservative photon routing switch is implemented as a room temperature, optical, vertical cavity X-gate (also sometimes known as a Fredkin gate). Such gates are primitive structures into which all logic functions can be decomposed. The construction of the device makes it uniquely suited to dense packed arrays of optoelectronic components for optical routing and logic. In one of the switching states, light incident on the device from either side of the wafer will pass through the device (the device is bi-directionally transmissive). In the other switching state, light incident from either side of the wafer will be reflected. Switching can be performed using either electrical or optical control. Thus incident photons are either routed through the device or reflected from the device. The characteristics of the device operation for both transmission and reflection are designed to be nearly identical regardless of whether the incident light impinges upon the top of the device or the bottom of the device (after passing through the substrate). This ability to have input light from either side makes the device reversible. This dual reversible and conservative nature along with the vertical cavity format allows for dense two dimensional arrays of devices to be formed on a single substrate. Furthermore, because the incident photon stream is recoverable in both the on and off states and can be recovered from either the top or the bottom of the wafer, device layers can be vertically stacked. Thus the device is useful for 3-D device geometry in which optical outputs from one set of devices can be directly used as the inputs to other sets of devices.

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