# Linearized Integrated Microwave Photonic Circuit for Filtering and Phase Shifting

## TL;DR

This paper presents a reconfigurable integrated microwave photonic circuit capable of high-extinction filtering and tunable phase shifting, combining multi-functionality and linearization for high-performance RF applications.

## Contribution

The work demonstrates a novel integrated circuit that achieves reconfigurable RF functions with high linearity and performance, advancing integrated microwave photonics.

## Key findings

- Achieved >50dB notch filtering over 6-16 GHz
- Realized 2π tunable phase shifting over 12-20 GHz
- On-chip linearization yields >120dB·Hz^{4/5} dynamic range

## Abstract

Photonic integration, advanced functionality, reconfigurability, and high RF performance are key features in integrated microwave photonic systems that are still difficult to achieve simultaneously. In this work, we demonstrate an integrated microwave photonic circuit that can be reconfigured for two distinct RF functions, namely, a tunable notch filter and a phase shifter. We achieved $>$50dB high-extinction notch filtering over 6-16 GHz and 2$\pi$ continuously tunable phase shifting over 12-20 GHz frequencies. At the same time, we implemented an on-chip linearization technique to achieve a spurious-free dynamic range of more than 120$\rm{dB}\cdot \rm{Hz}^{4/5}$ for both functions. Our work combines multi-functionality and linearization in one photonic integrated circuit, and paves the way to reconfigurable RF photonic front-ends with very high performance.