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.
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 tunable and reconfigurable microwave photonic filter based on two cascaded Mach-Zehnder modulators (MZMs)
and a dispersive medium is presented, theoretically discussed and experimentally demonstrated. A single-wavelength
laser diode (LD) and the first MZM are used to obtain a multi-wavelength optical source, and the second MZM is
modulated with the signal to be processed. The dispersive medium provides the time delay for different taps, since
different wavelength experiences different time delay, when it travels in the optical fiber. By adjusting the modulation
frequency and the bias voltage on the first MZM, the wavelength spacing and the relative amplitude of the optical tones
after the first MZM can be changed, thus making the filter tunable and reconfigurable. The presented microwave
photonic filter has been implemented in the experiment. The experimental results agree well with the simulation results,
and show that the present microwave photonic filter has good tunability and reconfigurability. The mainlobe-to-sidelobe
ratio (MSR) of around 25dB is achieved for the presented filter in the experiment.
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.
We proposed a novel microwave-band radio-over-fiber system with wavelength-division multiplexing (WDM) bus architecture. An electrooptic phase modulator combined with Fiber Bragg Gratings (FBGs) can realize frequency multiplying. Here the FBGs are used to fulfill three main tasks: convert phase modulation into intensity modulation, filter away unwanted optical frequency components, and work as demultiplexers in the WDM radio-over-fiber system. Simulation demonstrates a system capable of multiplying the frequency of differential phase-shift keying (DPSK) modulated signals from 2.7GHz to 5.4GHz (two times), 10.8GHz (four times) and even higher frequency values after transmitting the signals over 0.5 km of polymer optical fiber. Such a RoF system is cost-effective and suitable to install in in-house environment.
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