19-core fan-in/fan-out waveguide device for dense uncoupled multi-core fiber

A compact 19-core fan-in/fan-out waveguide device for uncoupled multi-core fibers was demonstrated using laminated polymer waveguide. The coupling losses from a 19-core fiber to nineteen single-core fibers were less than 2.0 dB and the sum of crosstalk from all neighboring cores were lower than -40 dB.