Abstract
A serial photonic digital-to-analog converter (PDAC) is proposed based on optical time and wavelength interleaving processing. In the proposed system, an intensity weighted, time and wavelength interleaved optical pulse train is generated by optical phase modulation and fiber dispersion. The obtained optical pulses are on-off keying modulated by the input serial digital bit stream. After dispersion compensation, an optical signal with the power proportional to the weighted sum of the input bits stream is obtained, and digital-to-analog conversion is implemented. Compared with the previous PDACs, the system complexity and cost are reduced. The system stability is also enhanced thanks to the compact configuration. A 4-bit 10GSa/s PDAC is experimentally demonstrated. The results can verify the feasibility of the proposed PDAC, which has the potential to realize high speed and high resolution digital-to-analog conversions in further communication and radar systems.
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