A photonic integrated spatial mode controller with reflective structure

A photonic integrated spatial mode controller was demonstrated, which consisted of a 100-channel arrayed-waveguide-grating (AWG), a phase and amplitude modulator array and a reflector array based on the thin-film z-cut lithium niobate platform. The fabricated integrated chip exhibited a narrow channel interval of about 50 pm. The measured response time of the amplitude controller based on a Mach-Zehnder interferometer (MZI) is less than 0.5 us.