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The wavelength-shift-free optical phase conjugation technique using orthogonal pumps is verified experimentally via the coherent detection technique. 20Gbps optical QPSK signal and its conjugate are simultaneously demodulated as a polarization-multiplexed signal.
This paper describes a scenario of highly resilient mobile backhaul using the radio-over-fiber (RoF) technology. RoF-based millimeter-wave high-speed transmission is useful for quick recovery from severe physical damage of the network infrastructure. As a possible approach, we demonstrated polarization division multiplexing optical and 2×2 multi-input multi-output radio seamless hybrid downlink transmission...
Digital coherent detection and radio-over-fiber technologies allow the realization of direct seamless conversion between optical and radio networks. We propose a photonic dig- ital transmission with analogue signal synthesis technique to provide high-speed simultaneous transmissions.
20-Gbaud QPSK transmission over 20-km SMF for optical and 7.5-m free space for 90-GHz radio is successfully demonstrated with 50-dBi Cassegrain antennas. This configuration will be feasible for kilometer-order distance transmission.
40-Gb/s W-band 16-QAM radio-over-fiber signal is optically synthesized using dual-polarization QPSK modulator. Its wireless transmission within FEC limit is demonstrated with optical self-heterodyne detection and digital signal processing.
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