A wideband 16QAM radio-over-fiber 100km transmission system using a DSB-SC-based RSH technique was experimentally demonstrated, and the system performance was evaluated analytically. It was concluded that the fundamental receiver sensitivity of the proposed technique is much better than conventional SCM systems, and is only 6 dB worse than a conventional coherent heterodyne system.
Sources of transmission system penalty have also been analytically identified, including phase noise, frequency response, optical amplifier noise, and fiber nonlinearity. A ~ 7 dB residual MER penalty was observed even DSP was used to improve the back-to-back system performance, and this large system penalty is mainly caused by the non-ideal ADC, digital matched filter, equalizer, and the non-ideal generation of 4-PAM signal at the transmitter. A 64-QAM signal would be even more challenging because of the 6 dB higher OSNR requirement.
In the second part of this dissertation, a single-fiber O-UPSR protection scheme without doubling the number of required optical transmitters was demonstrated. The transport capacity of a conventional 10Gb/s, 100-GHz-spaced, two-fiber O-UPSR system is maintained by generating two duplicated, 50-GHz-spaced 10 Gb/s signals via a single optical DSB-SC transmitter. The optimum modulation index of the microwave tone in driving a DSB-SC modulator was carefully analyzed and experimentally verified, so that a maximum suppression of optical carrier and 2nd harmonic distortions can be obtained simultaneously.
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