KEYWORDS: Radio over Fiber, Polarization, Eye, Telecommunications, Nonlinear optics, Wireless communications, Four wave mixing, Interference (communication), Signal processing, Extremely high frequency
In this paper, all-optical wavelength conversion based on FWM in ROF system is theoretically analyzed. It can be used
to generate the optical millimeter wave signals and to implement the all-optical frequency up/down conversion in ROF
systems. Due to the ultrafast nonlinear response of the HNL-DSF, it is possible to realize terahertz waveform all-optical
mixing or up-conversion. All-optical frequency up-conversions of an optical IF signal to the upper frequency band using
FWM without serious crosstalk were demonstrated. Based on analysis of the all-optical wavelength conversion in high-nonlinear
fiber, main factors related to the conversion efficiency are presented. Methods to increase the conversion
efficiency have been discussed. With the longer high-nonlinear fiber, the higher nonlinear coefficient, the appropriate
power of the pump, the appropriate polarization between the signal and the bump, and high efficiency to implement the
wavelength conversion can be achieved. The theoretical analysis is verified by the simulation results.
The XPM technique is applied to the demodulation system for fiber grating sensor for the first time in this thesis.
According to XPM principle, the intensity of accessorial light can be altered by feedback control and the phase of the
light signal from the M-Z interferometer can be modulated in a phase-locked way, thus the system phase-difference can
be locked at the point of the highest sensitivity. It resolves the precision non-linearity of interferometric demodulation,
the limit of very small range for demodulating, the non-linearity of the demodulating sensitivity, the affect of backlight
and undercurrent pair in the demodulating circuit, the delay-effect by PZT tune and the error from the machine.
KEYWORDS: Phase modulation, Radio optics, Dispersion, Modulators, Radio over Fiber, Modulation, Microwave radiation, Signal detection, Eye, Telecommunications
We have theoretically investigated the transmission performance of the optical microwave up-conversion link by using a
phase modulator and a dispersive fiber (standard single mode fiber). A theoretical approach has lead to the evaluation of
the influence of dispersion on the 60 GHz radio-over-fiber (ROF) links. According to our theoretically analysis, the data
signals carried by optical millimeter (mm)-wave after transmission along fiber suffer not only from fading but also from
the time shift of the code edges due to the fiber dispersive, which limits the transmission distance of the optical mm-wave
signals. The simulation results agree well with our theoretical analysis.
A new optical heterodyning method based on the Fiber Bragg Grating Filters is proposed. Because the two optical waves
for heterodyning are filtered from a single laser, this technique can eliminate the phase noise of the usual optical
heterodyning technology and the system performance is improved. With the simulation results, the system's transmission
performance of the optical millimeter wave by the new method is verified.
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