IMPROVEMENT OF OPTICAL BEAM-FORMING NETWORKS BASED ON BROADBAND OPTICAL SOURCE AND CHIRPED FIBER GRATING

摘要

We propose a photonic beam-forming network scheme based on a broadband optical source (BS), double sideband suppressed carrier (DSB-SC) modulation, and a chirped fiber grating (CFG). The principle and feasibility are proved by both theoretical analysis and experiments. In 20-32 GHz microwave band, experimental results show a good delay time consistency and the ratio of RF signal to noise met the practical application demands. The time consistency errors are smaller than 3 ps in 20-40 GHz band. Specially, compared with traditional double sideband (DSB) modulation scheme, in the proposed approach the dispersion-induced RF power degradation is effectively mitigated over 24 dB at 30 GHz, and the experimental results agree well with the theoretical ones.