| http://www.w3.org/ns/prov#value | - The coupling arrangement of claim 1 in which said fiber is a first cylindrically shaped fiber waveguide having a substantially uniform index of refraction exceeding that of said substrate and a diameter in excess of about times the free space wavelength of said wave to be guided therein, and including means external to said substrate for joining said first fiber waveguide to a second fiber wavegui
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