| http://www.w3.org/ns/prov#value | - Input optical port 109 may be defined structurally or functionally (as described hereinabove), and the input optical signal may be transmitted into the slab waveguide by any suitable means, including but not limited to a channel waveguide, an optical fiber, a surface mounted prism, a surface coupling grating, free-space propagation through an edge of the slab waveguide, and so forth.
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