Abstract
We propose and experimentally demonstrate a cost-effective radio-over-fiber (RoF) system to simultaneously generate and transmit multiband and multi-gigabit 60-GHz millimeter wave (MMW) signals using frequency quintupling technique. Multiband signals at 56-GHz and 60-GHz are realized with two cascaded single-drive Mach-Zehnder modulators (MZMs), where phase control is not required. Furthermore, only low-frequency (≤12GHz) optical and electrical devices are used in the central station (CS), which enable a cost-effective system. At the user-terminal, two-stage down-conversions are employed by envelope detection (ED) and intermediate frequency (IF) mixing, eliminating expensive high-speed synthesizer and critical phase control components. Error-free performances are achieved for the multiband MMW signals after 50-km single-mode fiber (SMF) and 10-ft wireless link transmissions.
Highlights
The ever-increasing video-based interactive and multimedia services are requiring large bandwidths and high data rates in wireless access networks. 60-GHz wireless technology has gained much attention for its wide bandwidth availability over the 7-GHz unlicensed millimeter-wave (MMW) band [1,2,3,4,5,6]
We propose and experimentally demonstrate a cost-effective radio-over-fiber (RoF) system to simultaneously generate and transmit multiband and multi-gigabit 60-GHz millimeter wave (MMW) signals using frequency quintupling technique
Multiband signals at 56-GHz and 60-GHz are realized with two cascaded single-drive Mach-Zehnder modulators (MZMs), where phase control is not required
Summary
The ever-increasing video-based interactive and multimedia services are requiring large bandwidths and high data rates in wireless access networks. 60-GHz wireless technology has gained much attention for its wide bandwidth availability over the 7-GHz unlicensed millimeter-wave (MMW) band [1,2,3,4,5,6]. Thanks to the huge bandwidth and low transmission loss provided by optical fibers, radio-over-fiber (RoF) technology is considered to be a promising solution to increase capacity and mobility as well as to reduce overall cost in wireless access networks [2]. In Ref [11,12,13,14], several demonstrations were carried on to realize multiband-signal transmissions based on RoF technology. All of the schemes produced widely-separated bands (baseband, microwave and millimeter wave) to carry single service [11,12] or multi-services [13,14], none of them realized multiband signal within 60GHz band. After 50-km single-mode fiber (SMF) transmission, at the base station (BS), the RoF signal is detected by a high-speed photodetector (PD) and broadcast to end users through a 60-GHz antenna. In order to improve transmission performance, single side band (SSB) modulation is employed to reduce chromatic dispersion (CD) and fading effects accumulated through fiber transmission
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