Integrated optic Y-branching waveguides with an asymmetric branching ratio are proposed by using a novel and simple waveguide configuration. Realisation of a controllable wide branching ratio, simply by shifting the centre axes of the input taper waveguide and the branching waveguide group is clarified both theoretically and experimentally. 1 × 2 Y-branch splitters with an asymmetric branching ratio of 50.0 ~ 75.6%, a low excess loss of <0.2 dB and based on planar lightwave circuits are demonstrated.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el_19960503
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