Abstract
We propose and experimentally demonstrate a simple and cost-effective bidirectional radio-over-fiber (RoF) system for transmission of downstream multiband signals and upstream data. At the central station (CS), the multiband data consisting of baseband, micro-wave (MW) and millimeter-wave (MMW) signals are generated using only one single-drive x-cut Mach-Zehnder modulator (MZM), which is driven by a clock signal at radio frequency (RF) port and an electrical data at bias port. Upstream data transmission is realized by re-modulation of filtered frequency-shift-keying (FSK) signal, selected from the multiband signals.
Highlights
The next-generation access networks are converging wireline and wireless services to offer end users more choices and greater convenience
Multiband signals were obtained using a dual-arm Mach-Zehnder modulator (MZM) driven by a 20-GHz clock in one arm and a 40-GHz electrical sub-carriers multiplexing (SCM) signal in the other arm, which required highfrequency synthesizer and high-speed electrical devices such as quadruplers and mixers [8]
While, when ε (t) is “0”, the MZM is biased at the peak of the transmission curve and the output signal consists of the optical carrier and second-order harmonic components (Fig. 1 (c)), which can be given by: Eout 2
Summary
The next-generation access networks are converging wireline and wireless services to offer end users more choices and greater convenience. Multiband optical transmission technology, which can simultaneously deliver baseband, micro-wave (MW) and millimeter-wave (MMW) signals, is an attractive candidate. It enables flexible applications in future access networks, where wireline data transports and wireless signal deliveries at different radio frequency (RF) carriers are seamlessly converged in an integrated platform. Demonstrated a RoF system for generation of multiband signals using a dual-parallel Mach-Zehnder modulator (DPMZM) followed by a single-drive Mach-Zehnder modulator (MZM), with complex transmitter architecture and high insertion loss. The transmitter in the central station (CS) consists of only a single-drive x-cut MZM without additional RF electronic processing devices (combiners or mixers), enabling a low-cost architecture. Our scheme is scalable to achieve above 100-GHz MMW
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