Y-branch used as building blocks of guided wave devices, such as Mach Zender type interferometers. Although many researches on Y-branch(2-branch) have been published, multibranch waveguides have been received less attention~(1)(4). Equal power division for planar 3-branched waveguide was shown numerically by proper modificationof refractive index distribution of taper and branches. Equal power divider consisting of 3-channel waveguides based on this design consideration was fabricated n glass by ion-exchange techniques.
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