| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWING A complete understanding of the present invention and of the above and other objects thereof may be gained from a consideration of the following detailed description presented hereinbelow in connection with the accompanying drawing in which: FIGS. 1 and 2, included for purposes of explanation, depict an optical coupler comprising two equal-length graded-index cylin
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