共查询到19条相似文献,搜索用时 15 毫秒
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等效双芯光纤通信中消除孤子分裂与变形的方法 总被引:7,自引:3,他引:4
籍助等效双波导孤子耦合模型,利用自伴算符方法,通过高阶色散耦合非线性薛定谔方程,分析了光纤通信中孤子的传输与耦合特性,提出了利用强抽运光在非线性光学介质中诱导出的相位孔来补偿探测光的衍射,从而消除光学孤子分裂与变形的方法. 相似文献
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非线性平板介质波导传输特性的网络分析 总被引:1,自引:0,他引:1
本文提出了分析包含非线性介质的层状介质波导特性的等效传输线方法。通过把线性和非线性介质分别用等效传输线表示,从而把非线性介质这一复杂的电磁场问题等价成一个电路问题求解。其本征方程可以利用横向谐振原理得到。本文最后分析了层状介质波导包含饱和和非饱和非线性介质时TE模的传播功率与归一化传播常数之间的关系。所获得的结果与有关文献符合得相当好。 相似文献
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本文提出了分析包含非线性介质的层状介质波导特性的等效传输线方法,通过把线性和非线性介质分别用等效传输线表示,从而把非线性介质这一复杂的电磁场问题等价成一个电路问题求解,其本征方程可以利用横向谐振原理得到,本文最后分析了层状介质波导包含饱和非饱和非线性介质时TE模的传播功率与归一化传播常数之间的关系。所获得的结果与有关文献符合得相当好。 相似文献
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基于随机等效采样的高速数据采集系统的设计 总被引:4,自引:1,他引:3
随机等效采样实际上是以触发点为时间参考基准对周期快变信号进行采样、存储和重构的技术。随机等效采样的关键在于精确测量触发点与下一个采样时钟间的时间间隔,以及通过等效采样算法确定各次采样数据在信号重建的位置,本文给出了这个时间间隔的测量电路和随机等效算法模型。 相似文献
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陶世兴王博彭其先李泽仁 《光通信研究》2013,(3):41-44
基于高重复频率低抖动激光器,结合波分复用和时分复用,设计了一套高采样率高精度的光采样系统。给出了光采样量化精度、采样率与采样脉冲时间抖动以及幅度抖动的关系。分析了系统的偏振特性及减小色散累积时间抖动、光纤折射率引起的时间抖动的措施,同时讨论了高功率短脉冲激光在光纤中传输的非线性效应抑制措施。 相似文献
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提出了一种新的基于半导体光放大器非线性偏振旋转效应的全光采样方法,利用速率方程对全光采样的理论机理进行了阐述.借助该速率方程模型对采样器的输入偏振角、偏振控制器的附加相移和偏振合束器的偏振方向等参数进行了优化设计.计算结果表明,采样器传输曲线具有较好的线性工作范围,能够实现模拟光信号的高速全光采样,且其输入泵浦光功率小于1mW.由于该全光采样的工作原理与全光波长转换类似,而目前的全光波长转换工作速率可达320Gbps,因此该全光采样的采样速率可望达到上百GS/s. 相似文献
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提出了一种新的基于半导体光放大器非线性偏振旋转效应的全光采样方法,利用速率方程对全光采样的理论机理进行了阐述.借助该速率方程模型对采样器的输入偏振角、偏振控制器的附加相移和偏振合束器的偏振方向等参数进行了优化设计.计算结果表明,采样器传输曲线具有较好的线性工作范围,能够实现模拟光信号的高速全光采样,且其输入泵浦光功率小于1mW.由于该全光采样的工作原理与全光波长转换类似,而目前的全光波长转换工作速率可达320Gbps,因此该全光采样的采样速率可望达到上百GS/s. 相似文献
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研究了傍轴厄米-椭圆高斯光束在强非局域非线性介质中的传输特性.依据强非局域介质响应函数特征宽度远大于光束束宽,对非局域非线性薛定谔方程进行了近似简化,得到了介质响应函数为椭圆对称情形下的强非局域模型.在此基础上利用分离变量法得到了厄米-椭圆高斯空间光孤子解析解及其形成的条件.进一步研究发现,随着厄米-椭圆高斯空间光孤子阶数的增大,光束束宽增大,介质的非局域程度相对减弱;要获得高阶椭圆高斯空间光孤子,必须提高非局域介质的非局域程度.最低阶的厄米-椭圆高斯空间光孤子就是椭圆高斯空间光孤子. 相似文献
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为了克服高比特率光信号实时取样时所面临的高速模数转换(ADC)限制,构建了一套基于高非线性光纤(HNLF)中四波混频效应的全光等效取样系统。全光取样系统主要包括取样脉冲信号产生、全光取样门和信号处理3部分,其中全光取样门为本系统的核心部分。取样脉冲和信号共同注入到HNLF中,基于四波混频效应实现全光取样。实验中,分别以10Gb/s、40Gb/s非归零OOK信号进行了取样实验验证。实验结果表明该取样系统可以实现高速光信号的取样过程。本文取样系统结构简单,且不受光信号速率的限制,可应用于更高速率的信号测量。 相似文献
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Nonlinear optical effects in fibers are significant in three respects. They present undesirable transmission limitations for long-distance optical fiber communication systems due to the intensity-dependent loss and pulse waveform distortions. On the useful side, they provide efficient frequency conversion means for generating frequency-shifted optical sources for a variety of spectroscopic applications including optical fiber measurements and optical device characterization. In addition, nonlinear optical effects also can provide useful special optical device functions such as optical amplification, optical gating, optical pulseshaping, and waveform equalization. This paper gives a brief review of the latter two aspects of nonlinear optics in fibers. 相似文献
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An equivalent-time jitter synthesis experiment is described which allows laboratory evaluation of transoceanic regenerated optical transmission systems. Results are reported for the systematic timing jitter accumulation obtained over a 591.2 Mbit/s, 6000 km route derived from the simulated concatenation of 60 regenerated sections 相似文献
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为了研究模拟光信号在半导体光放大器中的交叉相位调制特性,以正弦波和三角波两种模拟光信号为例,采用数值计算的方法,详细分析了交叉相位调制过程中模拟信号的增益、非线性相移差和啁啾。结果表明,当信号光和控制光之间采用帧同步方式时,信号光脉冲各点的增益及增益差出现波动,非线性相移差将围绕理想值π出现不同程度的偏离;采用比特同步方式可使信号光脉冲各点非线性相移差均衡,此时所需的控制光脉冲和信号光脉冲波形类似。 相似文献
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In this paper, a dynamic optical arbitrary waveform generator (OAWG) based on cross phase modulation (XPM) is proposed. According to the characteristics of XPM, the nonlinear phase shift of signal can be changed along with the pump power. The amplitude of signal can be changed by controlling the phase shift at one arm of a Mach-Zehnder interferometer (MZI) using XPM effect between signal and pump. Therefore, the phase and amplitude of the optical frequency comb (OFC) can be controlled by two pump arrays. As a result, different kinds of waveforms can be synthesized. Due to the ultrafast response of XPM, the generated waveform could be dynamically updated with an ultrafast frequency. The waveform fidelity is affected by the updating frequency. 相似文献
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Westlund M. Andrekson P.A. Sunnerud H. Hansryd J. Jie Li 《Lightwave Technology, Journal of》2005,23(6):2012-2022
An all-optical waveform sampling system with simultaneous submilliwatt optical signal sensitivity (20-dB signal-to-noise ratio) and subpicosecond temporal resolution over more than 60-nm optical bandwidth is demonstrated in this paper. The optical sampling was implemented by four-wave mixing in a 10-m highly nonlinear fiber using a sampling pulse source with a sampling pulse peak power of only 16 W. The sampling performance was evaluated in terms of sensitivity, temporal resolution, and optical bandwidth with respect to fiber length, sampling pulse source wavelength offset from the zero-dispersion wavelength of the highly nonlinear fiber, sampling pulse peak power, and walk-off due to chromatic dispersion. This paper also presents a summary of the available methods to achieve polarization-independent optical sampling as well as a brief summary of the available sampling pulse sources viable for optical sampling. 相似文献
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Rodwell M.J.W. Allen S.T. Yu R.Y. Case M.G. Bhattacharya U. Reddy M. Carman E. Kamegawa M. Konishi Y. Pusl J. Pullela R. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1994,82(7):1037-1059
We describe active and nonlinear wave propagation devices for generation and detection of (sub)millimeter wave and (sub)picosecond signals. Shock-wave nonlinear transmission lines (NLTL's) generate ~4-V step functions with less than 0.7-ps fall times. NLTL-gated sampling circuits for signal measurement have attained over 700-GHz bandwidth. Soliton propagation on NLTL's is used for picosecond impulse generation and broadband millimeter-wave frequency multiplication. Picosecond pulses can also be generated on traveling-wave structures loaded by resonant tunneling diodes. Applications include integration of photodetectors with sampling circuits for picosecond optical waveform measurements and instrumentation for millimeter-wave waveform and network (circuit) measurements both on-wafer and in free space. General properties of linear and nonlinear distributed devices and circuits are reviewed, including gain-bandwidth limits, dispersive and nondispersive propagation, shock-wave formation, and soliton propagation 相似文献
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The increase in WDM transmission distance at zero-dispersion wavelength made possible by pre-compensation to offset nonlinear interchannel crosstalk is studied. A simulation shows that pre-compensation allows higher fibre launched power and increases the transmission distance by 3.3 times for a 50 GHz-spaced 8-channel WDM system. Pre-compensation is shown to be limited by the undeterministic nonlinear distortion induced by the accumulated amplifier spontaneous emission noise from repeater amplifiers. Also, optical power tolerance of the pre-distorted waveform generated at the transmitter is studied. 相似文献