Compact integrated 1 × N polarization-insensitive optical power splitters via waveguide arrays

We present a compact and polarization-insensitive 1 × N optical power splitter based on a non-uniform array of coupled silicon nitride waveguides. A 1 × 5 prototype is fabricated and tested with uniform power distribution with a low power imbalance across an 80 nm bandwidth in the C + L bands. The core splitting footprint is 13 µm² per port. Unlike previous polarization-insensitive devices with 1 × 2 configurations, our work realizes a compact and polarization-insensitive splitter with multiple outputs, suitable for scalable and fabrication-tolerant integration.