Abstract
A hybrid fiber–radio access network architecture for simultaneous wireline and wireless transmissions of
Data-Over-Cable Service Interface Specification (DOCSIS) signals is presented. An all-optical harmonic up-conversion
technique using a dual-drive Mach–Zehnder modulator provides the downstream optical signal modulated not only
at the intermediate frequency in the 600- to 900-MHz band for wireline transmission but also at the up-converted
frequency in the 5.45- to 5.75-GHz band for wireless transmission. An InGaAsP/InGaAsP multiple-quantum-well
asymmetric Fabry–Pérot modulator/detector has been designed, fabricated, and packaged and has been
employed in the base station (BS) as an optical/electrical transducer, simultaneously providing the functions of
optical intensity modulation and photodetection. At the BS, the DOCSIS signals are recovered at the wireline and
wireless frequencies for the respective feeding of a cable access network or a fixed wireless access network in a
highly flexible approach. Full-duplex operation has been demonstrated for both access types in an indoor laboratory
environment. In a subsequent small-scale field trial, real-life Internet traffic provided by a local community
antenna television system operator has been transported over the present hybrid fiber–radio access network
architecture, and simultaneous transmission of both DOCSIS and digital television signals has also been performed.
© 2007 IEEE
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