Optical logic using semiconductor ring lasers

Details Optical logic using semiconductor ring lasers Optical logic using semiconductor ring lasers

1990-05-17

1991-07-09

Davie, James W.

Coherent light generators

Particular resonant cavity

Folded cavity

372 8, 372 92, H01S 3083

Patent

active

050311905

ABSTRACT:
Optical logic circuits utilize laser segments responsive to external optical signals to produce predetermined outputs in accordance with a desired logic function. Each segment has plural laser cavity legs joined at angled junctions to form at least part of a closed ring, with each segment including at least one light emitting, or exit, facet and at least one internally reflective facet at junctions of corresponding cavity legs. In a one-segment laser, the plural cavity legs form a closed ring. The laser is energized to propagate light in both directions around the ring, and external controls in the form of input light signals or reflective facets adjacent to a partially transmitting facet of the laser segment force unidirectional propagation to produce corresponding changes in the direction of emitted light from the laser. Multiple segments may be interconnected to produce more complex logic functions. In a multi-segment device, legs forming an internally reflective junction for a first ring are connected to legs forming an internally reflective junction for a second ring, with these two junctions being omitted so that light propagated in one ring travels into the second. The light-emitting facets for each segment are retained, so that a single segment device has a single set of emitting facets, a two-segment device has two sets of emitting facets, and so on, with the joined segments forming a closed, multi-segment path representing a selected logic function.

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