The technological steps for the fabrication of lapped fiber couplers are described in detail. Choice of materials and of working parameters as well as the diagnostic measurements of the process are discussed. The guidelines of design are outlined and data on the performances of manifactured wavelength-division-multiplexing couplers are reported. 50mm 2mm see Journal of Optical Communkations.Fig. 1: Geometry of the coupler and of the fiber holder
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