Optical transversal filter

  • US 5,329,118 A
  • Filed: 12/23/1992
  • Issued: 07/12/1994
  • Est. Priority Date: 12/23/1992
  • Status: Expired due to Fees
First Claim
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1. An optical transversal filter for processing an electromagnetic input signal comprising:

  • a light source adapted to generate a plurality of optical signals modulated in correspondence with said input signal;

    a plurality of optical time delay units optically coupled in a cascade, said cascade being optically coupled to said light source and adapted to differentially time delay selected ones of said plurality of optical signals passing therethrough;

    an optical trimmer device optically coupled to the last of said optical time delay units in said cascade; and

    a filter output assembly coupled to said optical trimmer device, said filter output assembly being adapted to convert the sum of the plurality of processed optical signals to a corresponding filtered electrical signal;

    each of said optical time delay units comprising a spatial light modulator (SLM) having an array of liquid crystal pixels disposed such that respective ones of said optical signals pass through respective pixels.

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