Photonic generation of ultra-wideband (UWB) pulse technology is the key technology of UWB-over-fiber system.
The effect of nonlinearity in semiconductor optical amplifier (SOA) is widely applied in the area of all-optical signal
processing. A method is proposed to generate UWB doublet pulse using cross-gain modulation (XGM) of SOA and self
gain-saturation (SGS) effect of SOA. In this method, the UWB monocycle pulse is generated by SOA-XGM, and the
UWB doublet pulse is generated by utilizing the generated UWB monocycle pulse and gain saturation effect of another
SOA. According to the proposed method, we obtained the UWB doublet pulse by utilizing photonic simulation software.
The center frequency is 4.85GHz and the fraction bandwidth is 122%, it meets the criterion of FCC.
A frequency interleaved multiplexing DWDM-ROF system was designed to improve the optical spectrum efficiency. In
this system, each gap between carrier and the sideband is fully utilized. In the proposed scheme, two chances of
baseband signals and two carriers for wireless applications with a data rate of 2.5Gbit/s, other two chances of baseband
signals for wired for applications. The signals are distributed over 50-km single-mode fiber without any compensation.
Meanwhile we designed a novel demultiplexer based on Fiber Bragg Grating (FBG) for this system. The simulation
experiment verified the feasibility of the proposed method, and also showed good ability to resist the channel crosstalk.
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