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Planar optical waveguide assembly and method of preparing same

  • US 6,905,904 B2
  • Filed: 06/24/2002
  • Issued: 06/14/2005
  • Est. Priority Date: 06/24/2002
  • Status: Active Grant
First Claim
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1. A method of preparing a planar optical waveguide assembly, comprising the steps of:

  • (i) applying a curable polymer composition to a surface of a substrate to form a polymer film;

    (ii) curing the polymer film to form a lower clad layer;

    (iii) applying a silicone composition to the lower clad layer to form a silicone film, wherein the silicone composition comprises;

    (A) an organopolysiloxane containing an average of at least two silicon-bonded alkenyl groups per molecule, (B) an organosilicon compound containing an average of at least two silicon-bonded hydrogen atoms per molecule in a concentration sufficient to cure the composition, and (C) a catalytic amount of a photoactivated hydrosilylation catalyst;

    (iv) exposing at least one selected region of the silicone film to radiation having a wavelength of from 150 to 800 nm to produce a partially exposed film having at least one exposed region and at least one non-exposed region;

    (v) removing the non-exposed region of the partially exposed film with a developing solvent to form a patterned film; and

    (vi) heating the patterned film for an amount of time sufficient to form at least one silicone core having a refractive index of from 1.3 to 1.7 at 23°

    C. for light having a wavelength of 589 nm;

    wherein the lower clad layer has a refractive index less than the refractive index of the silicone core.

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