We demonstrate a bidirectional millimeterwave (mmW) radio-overfiber system based on the use of a p-i-n photodiode (PD) used in non-linear regime. Since frequency down-conversion and photodetection are carried out by a single photodiode, base station (BS) architecture is simplified. Down-link transmission employs optical heterodyning technique for mmW generation and remote local oscillator (LO) delivery to BSs. Up-link scheme uses the electrical port of the PD as an input for optoelectronic mixing with the remotely delivered LO. Up-link and down-link have been successfully demonstrated for 397 Mbps and 794 Mbps binary phase shift keying complying with 60 GHz ECMA 387 standard. Error vector magnitude measurements and theoretical analysis are discussed as regards PD bias conditions. It is shown that PD can be used in this bidirectional system without any switching of the PD bias.
In this paper, theoretical model on phase noise in self-heterodyning optical system for mmW generation is proposed. Phase noise is impacted by optical path difference between both optical tones and laser source coherence time, but also by RF generators phase noise. Phase noise measurements of the mmW signal and RF sources have been realized to discuss the validity of the model. Based both on the theoretical approach and on the phase noise characterizations, an error vector magnitude (EVM) model is developed to quantify the impact of the optical self-heterodyning output phase noise on up-converted broadband digital signal (ECMA 387 standard). . Index Terms-radio over fiber (RoF), optical heterodyning, wavelength division multiplexing (WDM), phase noise, optical delay, error vector magnitude (EVM).
We propose a multi-band radio over fiber system compatible with wired and 60GHz band wireless transmission by implementing two-band modulation with a single Mach-Zehnder modulator. In this paper, broadband millimeter wave at 60 GHz band, which is compliant with the ECMA 387 standard, is generated by photodetection after 25 km long optical fiber transmission. Furthermore, baseband transmission, which feeds up the requirement of fiber-to-the-Home, has been realized simultaneously.Keywords-radio over fiber (RoF), photodetection, wavelength division multiplexing (WDM), multi-band modulation, fiber-to-the-home (FTTH).
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