Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 24, Issue 8, Pages 3028-3034Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2006.878015
Keywords
all-optical frequency downconversion; microwave photonics; photonic mixer; radio over fiber (RoF) system; semiconductor optical amplifier Mach-Zehnder interferometer; (SOA-MZI); wavelength division multiplexing
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Simultaneous all-optical frequency-downconversion technique utilizing a semiconductor optical amplifier Mach-Zehnder interferometer (SOA-MZI) is experimentally demonstrated, and its application to a wavelength-division-multiplexing (WDM) radio over fiber (RoF) uplink is proposed. The conversion efficiencies from 22.5 (f(RF)) to 2.5 GHz (f(IF) = f(RF) - 2f(LO)) are in the range from 1.5 to 3 dB for the optical RF wavelength between 1548 and 1558 nm. Error-free simultaneous all-optical frequency downconversion of the two WDM RoF upstream channels that carry 155-Mb/s differential phase-shift keying data at 22.5 GHz to an optical intermediate frequency signal having the frequency of 2.5 GHz with,the power penalty less than 0.1 dB at the bit error rate of 10(-8) is achieved.
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