| In this dissertation, the limitations and applications of wave-mixing effects in wavelength division multiplexing (WDM) systems are investigated. The main results are: I. The limitations to wavelength division multiplexing systems due to wave-mixing effects are explored. 1) Pulse four-wave mixing in wavelength division multiplexing systems is investigated and compared with continuous wave and quasi-continuous wave four-wave mixing. The influences of dispersion, walk-off, self-phase modulation, and cross-phase modulation on pulse four-wave mixing effects are comprehensively simulated. 2) Pulse four-wave mixing effects in standard single-mode fiber, non-zero dispersion-shifted fiber, and high-nonlinearity fiber are compared. 3) Power-dependent phase-matched four-wave mixing in dispersion-managed systems is analytically studied. The allocation of dispersion-managed systems is optimized to surpress four-wave mixing noises. II. Novel Broad-band wavelength converters based on quasi-phase-matched wave-mixing effects are designed. 1) The wavelength conversion of linearly chirped optical superlattices is analyzed, and its pros and cons in the WDM systems are pointed out. 2) A sinusoidally chirped optical superlattice is proposed for wavelength conversion in 1.5μm region, whose conversion bandwidth, pump bandwidth, and response flatness are largely improved. 3) A segmented optical superlattce is designed to enchance second-hamonic generation bandwidth and temperature tolerance. Multiple frequency conversion can be realized with this optical superlattice. III. Periodically poled lithium niobate and Mg-doped lithium niobate samples are fabricated. Second-hamonic generations of 1.06μm in the two samples are experimentally researched. The wave-mixing properties of lithium niobate and Mg-doped lithium niobate are compared.
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