| Summary: | 博士 === 國立交通大學 === 電信工程系所 === 96 === In this dissertation, we study the optical transmission systems and networks based on double-sideband modulation with suppressed carrier (DSB-SC) and digital signal processing (DSP) techniques. The main research results are organized in two
parts. In the first part, we experimentally and analytically proved the feasibility of a 100km radio-over- fiber (ROF) system using a 16-QAM signal with 5Gb/s bit rate and a carrier frequency of 18 GHz. The transmission system performance was
analyzed by considering optical amplifier noise, fiber nonlinearity, phase
noise, frequency response, and analog-to-digital converter (ADC) quantization
noise. The 18 GHz, 16-QAM signal could be sent from the base station to a
remote antenna port without any up-converter, and the remote terminal consists
of a down-converter and high-speed digital signal processors (DSPs) to recover the
16-QAM signal. The high-speed DSP, which partially compensates the
inter-symbol-interference (ISI) and phase-noise-induced system penalties, was
enabled by 20 Gs/s ADCs. The algorithms used in the DSP blocks were also
described in details. In the second part of this dissertation, a single-fiber optical unidirectional-path-switched ring (UPSR) based on subcarrier multiplexed double-sideband modulation with suppressed carrier was proposed and experimentally verified. This single-fiber UPSR architecture can be used to reduce the number of required optical transmitters, i.e., a single DSB-SC transmitter can be used for both east- and west-bound wavelengths.
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