| http://www.w3.org/ns/prov#value | - The optical waveguide includes a glass core member having a first minimum refractive index for the optical radiation and a glass cladding concentrically surrounding the core, the glass cladding including at least one layer having a second refractive index for the optical radiation which is lower than the minimum of the first refractive index by at least 0.1% to produce internal reflection of the o
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