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Analytical and experimental data are presented for a broadband (1–18 GHz) microwave photonic link featuring a novel linearized modulator. Because the input RF signal need only be applied to this linearized modulator's single set of electrodes, it suppresses nonlinear distortion across an inherently broad bandwidth.
By the proposed algorithm with iterative methods, the post digital linearization technique converted the distorted RF signal into the linear one. Experimentally, more than 29dB suppression of IMD3 has been achieved and a spurious-free dynamic range increases from 104.1 to 128.8dB within a 1-Hz bandwidth.
High dynamic range is a key requirement in advanced microwave photonic systems. We demonstrate compensation of nonlinearities occurring in microwave photonic links using a novel digital nonlinear equalization technique and demonstrate suppression of distortion products by 33 dB with a small number of equalizer coefficients.
We experimentally demonstrate fiber-nonlinearity-tolerant conjugated-paired radio-on-fiber (C-RoF) system for the first time. A C-RoF signal is simply generated by dual-sideband modulation and fiber nonlinearity is cancelled through asymmetric photonic heterodyne down-conversion. A QPSK-C-RoF signal is transferred over 20-km SMF fiber.
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