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Title Performance Evaluation and Analysis of Radio on Fiber Systems for Broadband Convergence Networks
Degree Ph.D.
Author Taesik Cho
Advisor Kiseon Kim
Graduation Date 2011.02.24 File
    Date 2013-09-11 16:43
Externally modulated RoF systems for high data rate multimedia services are an-
alyzed in the view of a physical layer. Usually, high data rate services require high
signal power. However, this high signal power causes lots of problems. Although most
of them can be reduced, phase noise and intermodulation distortion result in various
problems. Especially, they are dominant system performance degradation factors in
high signal power required services. In RoF systems, phase noise and intermodulation
distortion are closely related with power and frequency of input RF signal and optical
?ber length. Three issues are closely related to system parameters. In addition, system
performance optimization with a low signal power is necessary in order to provide a
good performance because high signal power results in the problems. In this disser-
tation, an entire RoF system performance evaluation and optimization is investigated
based on the three issues.
At ?rst, phase noise from RF oscillator as well as laser is considered in RoF sys-
tem incorporating an external modulator even though amount of phase noise from RF
oscillator is relatively small. OSSB modulation is also employed in order to overcome
power fading due to ?ber chromatic dispersion e?ect. Although ODSB modulation
can be simpler than OSSB, it is very sensitive to power fading due to ?ber disper-
sion. In addition, dual electrode Mach-Zehnder modulator (DEMZM) is utilized to
overcome chirp e?ect for a long distance transmission. Conventional direct detection
is also used.
광주과학기술원 한·러 MT-IT 융합기술연구센터 광주과학기술원정보통신공학부