Multi-Function Mode Processing Device for Mode Division Multiplexing Optical Networks

In this study, we propose a configurable multifunction device for the mode division multiplexing (MDM) optical networks. The device can simultaneously function as low- and high-order mode block filters and a mode exchanger by selectively tuning different working states. We fabricated the device using standard microfabrication technology and the experimental performance of the device adequately follows the simulated performance. Particularly, the device exhibits a measured mode extinction ratio of 22.20 dB and 19.46 dB as a low-order mode block filter at
$1.550~\mu \text{m}$
wavelength. The proposed device has great potential for use in a fully flexible and advanced MDM optical system.