Full-duplex hybrid PON/RoF link with the 10 Gbit/s 16-QAM signal for alternative wired and 60 GHz millimeter-wave wireless accesses
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A novel full-duplex hybrid access link with 10 Gbit/s 16-ary quadrature amplitude modulation (16-QAM) wired and wireless converged signal is proposed, which can provide PON access or RoF-based wireless access alternately with centralized lightwave source. The converged signal, consisting of the 10 Gbit/s 16-QAM baseband optical signal and two optical local oscillators (OLOs), is generated by central station and can be decomposed in different patterns at remote base station. For the wired PON access, the identical frequency OLO is used to coherently demodulate the 16-QAM signal; while for the RoF-based wireless access, the 16-QAM signal and its parallel polarized OLO are abstracted as optical millimeter wave by a polarization beam splitter; the other OLO is used as the uplink optical carrier to carry wired or wireless uplink signal. Since the three tones come from the same source, they maintain high coherency even after transmitted over fiber link. The proposed hybrid wired/wireless full-duplex fiber link suffers little from fiber chromatic dispersion. These are verified by simulations for both wired and wireless access applications.
KeywordsMicrowave photonics (MWP) Full-duplex link Hybrid wired/wireless access QAM (quadrature amplitude modulation)
This work was supported in part by the National Natural Science Foundation of China (NSFC, Grant 61001061), the Program for New Century Excellent Talents in University (NECT) with Grant No. NECT-11-0595, the Specialized Research Fund for the Doctoral Program of Higher Education (Grant No.: 20100005120014), and the Fundamental Research Funds for the Central Universities of China (Grant No.: 2013RC0209).
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