In this paper, the authors present and experimentally demonstrate an all-optical frequency up-conversion and
demultiplexing method in a radio-over-fiber (RoF) system. A Mach-Zehnder modulator (MZM) and a microwave
photonic filter based on a fiber ring structure are used to simultaneously realize the frequency up-conversion and
demultiplexing functions. In this proposed system, only a fiber ring and a photodiode (PD) are needed in the base station
(BS) to fulfill the signal processing functions. This simple solution makes the base stations more cost-effective, and
shows good application potential in the future radio-over-fiber systems.
KEYWORDS: Microwave photonic filters, Single mode fibers, Electronic filtering, Optical filters, Multiplexing, Linear filtering, Radio optics, Radio over Fiber, Telecommunications, Microwave radiation
A method for subcarrier demultiplexing in Radio-over-Fiber system has been proposed and verified experimentally. A
continuously tunable single resonance microwave photonic filter using the tunable fiber Mach-Zehnder interferometer
(MZI) as the slicing filter, is implemented to realize the demultiplexing. Two subcarriers, one is 2.4GHz representing the
wireless LAN signal , the other is 900MHz representing the Cellular signal, can be demultiplexed separately. The
proposed approach has been demonstrated both theoretically and experimentally.
A novel all-optical frequency up-conversion method implementing microwave photonic filter in a radio-over-fiber (RoF)
link is proposed and demonstrated. The electrooptical phase modulator, electrooptic intensity modulator in combination
with 75-km single-mode fiber (SMF) is used to form the microwave photonic filter and fulfill the frequency upconversion
function at the same time. The technique requires large modulation index at the phase modulator, which
simultaneously increases the efficiency of the frequency conversion. The proposed approach has been demonstrated both
theoretically and experimentally.
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