Schema Splitter Crosstalk1
1x2 splitter with common waveguide are typical of injection molded splitter, but also for splitters made by integrated optical technologies. The light coupled to one splitter branch generates Fresnell reflection at the common waveguide. The reflected and splitted light couples to the other splitter branch. Splitters like this show a typical crosstalk attenuation of 15-20dB.
Schema Splitter Crosstalk

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