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