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Rare earth element-doped optical waveguide and process for producing the same

  • US 5,206,925 A
  • Filed: 04/26/1991
  • Issued: 04/27/1993
  • Est. Priority Date: 06/29/1990
  • Status: Expired due to Fees
First Claim
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1. A rare earth element-doped optical waveguide comprising:

  • a substrate;

    a cladding provided on the substrate;

    a core waveguide provided in the cladding, the core waveguide being substantially rectangular in cross section with the width thereof greater than the thickness thereof; and

    a rare earth element-doped layer provided in the core waveguide along a waveguiding direction, whereby good optical confinement is ensured in the width direction of the waveguide.

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