{HEAD ~ The fabrication techniques} of the invention may be used to produce optical couplers, {TAIL ~ gratings}, and other multilayer devices of arbitrary shape for use with optical systems, in integrated circuit systems, and the like, where multilayered structures are needed 
used to produce
{ HEAD ~ The fabrication techniques } of the invention may be used to produce optical couplers , { TAIL ~ gratings } , and other multilayer devices of arbitrary shape for use with optical systems , in integrated circuit systems , and the like , where multilayered structures are needed
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