| http://www.w3.org/ns/prov#value | - The substrate 120 may be comprised of, for example, glass, silicon, silica, plastic or other well known materials used in the fabrication of optoelectric devices. [0019] The term planar waveguide core 130 as used herein refers to any material that is transparent to one or more wavelengths of light comprising, for example, an optical signal.
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