Femtosecond Laser Written Integrated Spatial Multiplexers for Few-Mode Multicore Fibre

摘要

We demonstrate compact femtosecond laser written 3D spatial multiplexers for few-mode multicore fibre operating across the C+L bands. The integrated tapered mode couplers feature direct mode-selectivity, excellent mode extinction ratios (up to 25 dB) and low insertion loss (～2 dB).