光波混频效应对波分复用系统性能的影响及其应用
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摘要
本论文以光波混频效应对波分复用系统的影响及其应用为题,从三个方面进行研究:
一、光波混频效应对波分复用系统性能的影响。1) 研究了波分复用系统中的脉冲四波混频效应,分析了色散、走离、自相位调制和交叉相位调制等效应在四波混频过程中的作用;2) 对比了单模光纤、非零色散平移光纤和高非线性光纤中脉冲四波混频效应的差别;3) 分析了色散管理系统中强度相关相位匹配的四波混频效应,并从抑制混频噪声的角度优化了色散管理系统的布置方式。
二、准相位匹配光波混频型宽带波长转换器件的设计。1) 分析了线性啁啾超晶格结构在1.5μm 通信波段的波长转换特性,指出其带宽的优势和响应平坦方面的不足;2) 提出了一种用于1.5μm 通信波段宽带波长转换的正弦啁啾超晶格结构,该结构不但在转换带宽和泵浦带宽上有所改善,而且响应十分平坦;3) 设计了一种分段周期超晶格结构用于提高激光倍频的带宽和温度允限,利用该结构还可以实现多频率同时输出的激光光源。
三、极化晶体倍频的实验研究。采用外加电场极化方法制作了周期极化铌酸锂和高掺镁铌酸锂晶体样品;利用该晶体样品进行了初步实验研究,得到了1.06μm 基频光的倍频输出,并对比分析了两种晶体材料的倍频性能。
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.
一、光波混频效应对波分复用系统性能的影响。1) 研究了波分复用系统中的脉冲四波混频效应,分析了色散、走离、自相位调制和交叉相位调制等效应在四波混频过程中的作用;2) 对比了单模光纤、非零色散平移光纤和高非线性光纤中脉冲四波混频效应的差别;3) 分析了色散管理系统中强度相关相位匹配的四波混频效应,并从抑制混频噪声的角度优化了色散管理系统的布置方式。
二、准相位匹配光波混频型宽带波长转换器件的设计。1) 分析了线性啁啾超晶格结构在1.5μm 通信波段的波长转换特性,指出其带宽的优势和响应平坦方面的不足;2) 提出了一种用于1.5μm 通信波段宽带波长转换的正弦啁啾超晶格结构,该结构不但在转换带宽和泵浦带宽上有所改善,而且响应十分平坦;3) 设计了一种分段周期超晶格结构用于提高激光倍频的带宽和温度允限,利用该结构还可以实现多频率同时输出的激光光源。
三、极化晶体倍频的实验研究。采用外加电场极化方法制作了周期极化铌酸锂和高掺镁铌酸锂晶体样品;利用该晶体样品进行了初步实验研究,得到了1.06μm 基频光的倍频输出,并对比分析了两种晶体材料的倍频性能。
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.
引文
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