Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 19, Issue 13-16, Pages 1206-1208Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2007.901702
Keywords
coherent transmission; I/Q demodulation; linearization; microwave photonics; phase detection; phase diversity; phase modulation; quadrature detection
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We demonstrate and characterize a new class of radio-frequency (RF)-photonic link for the linear transport of analog RF signals. Simultaneous and separate detection and digitization of optical in-phase and quadrature-phase signals is employed for linear phase demodulation in the digital domain. This is shown to allow significantly larger tolerance to imperfect physical implementation of the phase demodulating receiver. Digitizer-limited spur-free dynamic range improvement >12 dB.HZ(2/3) is observed in our baseband demonstration. Modulation depths significantly exceeding unity are allowed and demonstrated.
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