{HEAD ~ The present invention} relates to {TAIL ~ an optical waveguide structure} and in particular to an optical waveguide structure having a splitting/coupling element 
relates to
{ HEAD ~ The present invention } relates to { TAIL ~ an optical waveguide structure } and in particular to an optical waveguide structure having a splitting / coupling element
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH