Abstract
This work describes a proposed 60-GHz radio-over-fiber (RoF) system employing a frequency sextupling optical up-conversion scheme. Based on the modified single sideband modulation scheme, spectrally efficient vector signals were transmitted with no performance degradation due to dispersion-induced fading. Wavelength-division- multiplexed optical up-conversion can be realized using the proposed system. Since the required transmitter bandwidth is significantly reduced, radio-frequency components with lower bandwidth and higher reliability can be utilized. Both 13.75-Gb/s QPSK-OFDM and 20.625-Gb/s 8QAM-OFDM signals were experimentally demonstrated. After transmission over 25-km of standard single mode fiber, no significant received power penalty was observed.
Highlights
With the rapidly growing demand for bandwidth, millimeter-wave (MMW) frequencies along with spectrally efficient modulation formats have become potential candidates for generation broadband wireless communication systems
Based on the modified single sideband modulation scheme, spectrally efficient vector signals were transmitted with no performance degradation due to dispersion-induced fading
The proposed system is an interesting candidate for future high-throughput RoF systems operating at 60-GHz. no wireless transmission was performed in this paper, it is expected that a wireless link can be realized with reasonable antenna gain and gain and NF of LNA at the wireless terminal to overcome the high path loss (~70 dB) at 60 GHz by considering the quality of the signal generated at the RAU
Summary
With the rapidly growing demand for bandwidth, millimeter-wave (MMW) frequencies along with spectrally efficient modulation formats have become potential candidates for generation broadband wireless communication systems. The use of RoF systems to generate and transmit 60 GHz signals modulated with spectrally efficient modulation formats still remain a challenge [1,2,3,4,5,6,7]. Dispersion induced performance fading issue limits the transmission distance of 60-GHz RoF signals under 1-km in standard single mode fiber (SSMF) due to the generated double sideband (DSB) modulation scheme. The transmitter bandwidth is reduced and no dispersion induced performance fading is observed, radio-frequency (RF) components with frequency up to 30 GHz are still required. Only on-off-key (OOK) modulation format which has low spectral efficiency is usually utilized in DSB-CS systems [1,2,4]
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