Key Techniques Research For Microwave Photonic Satellite Repeater

Owing advanced functions of broadband multi-beams agility, signal processing of hundreds of channels of signals with complex formats are future trends of the next generation satellite payloads. In accordance with these trends, the satellite repeater, which is key to a satellite, is facing the requirement of higher frequency and wider bandwidth, and that is a great challenge to traditional electronical approaches. Microwave photonics(MWP) is considered to be a key support for the future broadband satellite communication systems, which will not only improve the performance in weight, size and electromagnetic isolation, but also be the enabling technology to realize new payload architecture and complex spaceborne signal processing.This thesis proposes and demonstrates new approaches and ideas in the key technologies of high quality local oscillator(LO) generation, photonic mixing, signal switching and the satellite repeater architecture based on photonic technologies, the main works are taken in the following aspects:1. In the generation of high-quality LO signal, theoretical analyses of optoelectronic oscillators(OEO) were carried out, and new schemes were proposed to extend its frequency range.A frequency-doubling OEO based on phase modulation is proposed to extend the working frequency range for two times. A wideband tunable up converting OEO based on stimulated Brillouin scattering effect was proposed to realize a tuning range from 10 to 42 GHz.2. In the microwave photonic mixing research, new schemes for multi-channel mixing were proposed based on OEOs. A scheme based on OEO was proposed to realize tunable high quality LO generation, wideband signal upconversion and the 360-degree range phase control. A frequency-quadrupling OEO was proposed to realize frequency-quadrupling signal generation and the upconversion of 1-Gbps signal to 40-GHz in multi-channels. A PolM-based OEO was proposed to implement the LO generation, multi-channel upconversion and compensation of dispersion.3. In the microwave photonic satellite repeater architecture research, new MWP satellite repeater architecture was proposed and demonstrated both in theories and experiments. The wavelength routing was used to realize photonic RF switching based on optical switch arrays. A 2x2 proof-of-concept microwave photonic repeater was realized using arrayed lasers, OEO, optical mixing and MEMS optical switch, and the stable switching of HD video signal was realized.