Spatio-temporal isolator in lithium niobate on insulator

In this contribution, we simulate, design, and experimentally demonstrate an integrated optical isolator based on spatiotemporal modulation in the thin-film lithium niobate insulator waveguide platform. We used two cascaded travelling wave phase modulators for a ring resonator as wavelength filter to suppress sidebands of reverse propagating light. This enabled us achieve isolation 27 dB. The demonstrated suppression light makes such isolators suitable integration with III-V laser diodes Erbium doped gain sections