Functional Programable Waveguide Engine and Arbitrary Beam Splitter

We demonstrated a waveguide engine which can update the thermal electrodes automatically and monitor the change of the interference in a synchronized and rapid way until the desired function is reached, all experimentally. We name this system “function programmable waveguide engine” (FPWE). Based on this technology, an arbitrary beam splitter is developed on a multimode waveguide by effectively manipulating the multimode interference through 4 microheaters. The device is designed by direct experiment data collection, model training with deep learning technology, and inverse calculation from the established mode. Result shows that any ratio can be achieved, including both lossless and lossy scenarios.