Optical waveguide and process for producing it

Optical waveguide and process for producing it

  • CN 1,147,746 C
  • Filed: 02/16/1995
  • Issued: 04/28/2004
  • Est. Priority Date: 02/17/1994
  • Status: Active Grant
First Claim
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1. optical waveguide comprises:

  • As a core in optical waveguide district, this core has a predetermined refractive index, and described core has a diffraction grating that forms and has the refractive index that changes periodically along the direction of propagation of light in its predetermined portions;

    AndA covering, this covering has low refractive index of refractive index than described core and covers described core in mode closely, described covering has a diffraction grating in the predetermined portions that is formed on it and has the refractive index that changes periodically along the described direction of propagationDescribed core and described covering all comprise germanium dioxide,It is characterized in that;

    The described diffraction grating that is formed in the described covering has covered the described diffraction grating that is formed in the described core in close-fitting mode, make described diffraction grating and the described diffraction grating in the described core in the described covering in the whole mode field zone of described optical waveguide, all reflect together to the light that is directed with a predetermined wavelengthThe concentration of the germanium dioxide in the described covering equals the concentration of the germanium dioxide in the described core.

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