Compact pitch-conversion (fan-in/out) polymer optical waveguide with graded-index circular cores for high-bandwidth-density on-board interconnects

We fabricate 12-ch. compact pitch-conversion multimode polymer optical waveguides with graded-index (GI) circular cores using the Mosquito method, and demonstrate that GI cores maintain the low optical loss and crosstalk even if steep curved channel patters are formed in order to realize a compact device.