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Electro-optical device

  • US 5,404,373 A
  • Filed: 11/08/1991
  • Issued: 04/04/1995
  • Est. Priority Date: 11/08/1991
  • Status: Expired due to Term
First Claim
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1. An electro-optical device comprising a semiconductor substrate,a vertical cavity surface emitting laser having multiple stacked layers on the substrate,a heterojunction phototransister having plural stacked layers at a position on the substrate that is optically isolated from the layers of said laser so said laser and said phototransistor are optically isolated from each other,said laser add phototransistor being electrically connected and arranged so that optical energy incident on said phototransistor causes current to be coupled from said phototransistor to said laser to energize said laser into a lasing condition,a heterojunction light emitting device including plural stacked layers on said heterojunction phototransistor, said layers of said heterojunction light emitting device and said layers of said heterojunction phototransistor being arranged so there are optical and electrical feedback paths between them.

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