Broadband and tunable RF photonic phase shifter based on optical SSB modulation and FBG filtering

Abstract

A broadband RF photonic phase shifter that can achieve the tunable phase shift with little RF power variation is presented. It is based on homodyne mixing technique. The beating between phase-modulated optical carrier and the first-order sideband can generate RF signal with desired phase shift. Results show the RF phase shifter can achieve a continuous 0–360° phase shift with low power variation at the frequency above 21.5GHz.