Improvement of optical beam-forming networks based on broadband optical source and chirped fiber grating

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 20–40GHz 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. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2992–2994, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23802

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