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We present a novel post-fabrication laser trimming technique to adjust the power splitting ratio of rib waveguide Y-junctions made in thermally crosslinked electrooptic polymers. The trimming is based on the index change due to photobleaching, and it takes only a few seconds. An adjustable range of the splitting ratio as wide as /spl plusmn/20% is achieved with less than 0.2 dB of excess loss. This...
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