On-chip tunable multi-mode interference reflector

Abstract

A two-port on-chip multi-mode interference reflector (MIR) for tuning reflection is proposed. This on-chip tunable MIR can tune not only the reflectivity but also the reflection phase. Reflectivity ranging from 0.1 to 0.8 with reflection phase from 0 to -0.4π can be achieved in the design. This on-chip tunable MIR opens a new way to construct a tunable on-chip resonator, which is useful for photonic integrated circuits.