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