Accession Number : ADD013993

Title :   Integratable Differential Light Detector.

Descriptive Note : Patent, Filed 7 Apr 87, patented 28 Jun 88,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Langer, Dietrich W ; Ezis, Andris

Report Date : 28 Jun 1988

Pagination or Media Count : 6

Abstract : This invention is directed to a three-terminal semiconductor device which acts as a differential light detector. It is based on the operation of two reverse biased PIN photodetectors where one receives light through its P-doped surface and the other through its N-doped surface. The device is configured to be compatible with applications in integrated optics and with fiber optics. In principle of operation the invention relies on the production and collection of electrons from the detection of a first light intensity and the production and collection of holes from the detection of the intensity of a second light. This is done in a connected or integrated semiconductor which allows the recombination of electrons and holes. The excess number of electrons or holes, depending upon which light is received with the greatest intensity, is extracted from the recombination region and is the basis for the output signal. Patents. (rh)

Descriptors :   *DETECTORS, *FIBER OPTICS, *INTEGRATED SYSTEMS, *PATENTS, *SEMICONDUCTORS, COLLECTION, DETECTION, ELECTRONS, HOLES(OPENINGS), INTENSITY, LIGHT, OPTICS, OUTPUT, PRODUCTION, RECOMBINATION REACTIONS, REGIONS, SIGNALS

Subject Categories : Optical Detection and Detectors
      Solid State Physics
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE