Low-Loss Multicore FIFO Device Based on Chemically Etched Optical Fibers

We present a low-loss fan-in/fan-out (FIFO) device fabricated from a bundle of chemically etched optical fibers integrated within a standard FC/PC connector. The device demonstrates efficient coupling with insertion losses of 0.32 dB and 0.40 dB at wavelengths of 1310 nm and 1550 nm, respectively. Crosstalk and back reflection were measured to be below −41.8 dB and 51.3 dB, confirming high channel isolation and minimal signal degradation. This compact and connectorized solution offers a practical approach for scalable multicore fiber interfacing in advanced optical communication systems.