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Mode shape converter, method for fabricating the mode shape converter and integrated optical device using the mode shape converter

  • US 6,396,984 B1
  • Filed: 01/21/2000
  • Issued: 05/28/2002
  • Est. Priority Date: 01/21/1999
  • Status: Expired due to Term
First Claim
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1. A mode shape converter interposed between an input or output terminal of a function executing unit included in an optical device and an optical fiber and adapted to couple a mode of the optical fiber with a mode of the input or output terminal of the function executing unit, the mode shape converter comprising:

  • a substrate;

    a lower clad coated over the substrate, the lower clad having an etched portion in a desired region;

    a lower rib waveguide formed on the etched portion of the lower clad;

    a core formed over the entire upper surface of both the lower rib waveguide and the non-etched portion of the lower clad;

    an upper rib waveguide formed on the core such that it is aligned with the lower rib waveguide, the upper rib waveguide having a desired shape; and

    an upper clad formed over both the upper rib waveguide and a portion of the core not covered with the upper rib waveguide.

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