Sub-20-dB noise figure and positive link gain in a chip-based Si3N4 microwave photonic filter

摘要

We present a microwave photonic notch filter based on a Si₃N₄ photonic chip, with a noise figure of less than 20 dB, a positive link gain and an ultra-deep rejection beyond 50 dB in the stopband. This level of performance is achieved by using on-chip resonators' unique phase responses, and thorough optimizations of the photonic link.