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Device for creating optical delays and application to an optical control system for a scanning antenna

  • US 5,430,454 A
  • Filed: 11/06/1991
  • Issued: 07/04/1995
  • Est. Priority Date: 03/16/1990
  • Status: Expired due to Term
First Claim
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1. Device for creating optical delays, comprising:

  • several optical switches arranged in a determined order and each comprising at least a first input and a second input and at least a first output and a second output, for switching between optically coupling either(a) the first input to the first output and the second input to the second output or(b) the first input to the second output and the second input to the first output;

    a light source emitting a light beam wherein the first input of one of the several optical switches is connected to the light source;

    wherein the first output of each one of the several optical switches is connected to the first input of the following one of the several optical switches, except for a first output of a last one of the several optical switches which is connected to a user circuit;

    a plurality of optical delay circuits;

    wherein the second output of each one of the several optical switches is connected to the second input of the following one of the several optical switches by the intermediary of one of said plurality of optical delay circuits;

    wherein each one of said plurality of optical delay circuits comprises two similar doubly refractive crystals disposed head-to-tail; and

    wherein the plurality of optical delay circuits (t1, t2, t3) induce different delays whose delay values constitute a geometric progression.

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