Abstract
We report a radio-over-fiber (ROF) access network with multiple high-repetive frequency mm-wave signals generation utilizing a dual-parallel Mach-Zehnder modulator (DP-MZM) and an semiconductor optical amplifier (SOA) for multiple base stations (BSs). In the scheme, at the central station (CS), signal and pump with frequency interval of 8fRF are generated by properly adjusting the parameters of the DP-MZM. After FWM in a SOA, new converted optical signals are obtained. Two tones of the optical signals are selected by using tunable optical filter (TOF), which are then sent into a photodiode (PD) to generate multiple mm-wave signals with different frequencies (8fRF, 16fRF, and 24fRF) for different BSs. Based on the proposed scheme, the mm-wave signals with frequencies of 20, 40, and 60 GHz carrying 2.5 Gb/s signal by a 2.5GHz RF signal have been generated by numerical simulation. Simulation results show that the proposed ROF system architecture with multiple-frequency millimeter-wave signals generation serving multiple BSs can work well. This scheme can raise the capacity of ROF system, reduce the requirement of the repetitive frequency of the driven RF signal, and support multiple mm-wave wireless access for BSs.
Highlights
Radio-over-fiber (ROF) system has been considered a promising technology for supporting generation broadband access networks since it can provide low transmission loss, wide bandwidth, immunity to radio-frequency (RF) interference, high flexibility, and enhanced microcell coverage [1,2,3]
We propose a ROF system with 20GHz, 40GHz, and 60GHz based on based on frequency octupling and four-wave mixing (FWM) techniques to providing multiband mm-wave wireless access
At the central station (CS), the lightwave is generated from an external-cavity laser (ECL) at 193.26 THz with a 100 MHz linewidth, which is divided into two parts by an optical power splitter
Summary
Radio-over-fiber (ROF) system has been considered a promising technology for supporting generation broadband access networks since it can provide low transmission loss, wide bandwidth, immunity to radio-frequency (RF) interference, high flexibility, and enhanced microcell coverage [1,2,3]. Some methods presented to produce high-repetitive frequency optical mm-wave were reported previously [7,8,9,10,11]. Octuple frequency mm-wave generation was reported by using multicascaded intensity modulators based on optical carrier suppression (OCS) scheme [9]. Multiband signals generation including baseband, frequency-doubled, and frequency-quadrupled has proposed based on a dual-parallel Mach-Zehnder modulator, following a single-drive MachZehnder modulator through optical carrier suppression and frequency-shifting techniques [12]. Anthoer scheme with multiband generation is proposed to generate an optical carrier suppression signal using two cascade MZMs [14]. We propose a ROF system with 20GHz, 40GHz, and 60GHz based on based on frequency octupling and FWM techniques to providing multiband mm-wave wireless access.
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