共查询到17条相似文献,搜索用时 62 毫秒
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分析了提高光纤参量放大增益、扩展带宽、降低偏振灵敏度的几种重要方法,全面综述了光纤参量在分立式集中放大、透明的波长转换、归零脉码生成、O—TDM开关、全光抽样、可擦除全光缓存、3R再生等方面的典型应用。 相似文献
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分析了光纤中零用附近的简并四波混频(FWM)和简并光参量放大(OPA)过程。在简并参量放大过程中,参量增益带宽可以达到35nm。简并上波混频对密集信道的影响在零色散点并不是最强的,而是稍微偏离零点,约10^-3ps/nm.km。 相似文献
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在受激散射过程中,光纤作为非线性介质,通过分子振动或声子的参与而起主动作用.然而在其它许多非线性现象中,光纤仅起被动作用,几个光波之间通过束缚电子的非线性响应产生相互作用。因为这些过程由光对介质参量(如折射率)感应调制所致,所以人们把它们统称为参量过程.这类过程包括谐波产生、四波混频、参量放大等非线性现象。本文§1节讨论四波混频的起因,§2节讨论四波混频理论,重点在参量增益。§3节介绍相位匹配技术和实验结果。§4节讨论参量放大及其应用。最后,§5节集中研究和频以及谐波的产生,并着重讨论了光纤中的二次谐波产生.当光纤以特定方式预置时,出现了出乎意外高的二次谐波转换效率。 相似文献
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评述了基于光纤的光参量放大器的理论基础,介绍了这种器件在光通信领域的应用情况,最后展望了这一领域的研究前景. 相似文献
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光纤参量放大器在当今高速WDM光纤通信系统中有广泛的应用前景,宽带宽是其主要特性之一,本文在分析诸如光纤的色散平坦斜率、零色散波长及双折射因素对光纤参量放大器增益带宽的影响的基础上,论述了拓宽增益带宽的几种方法和设计技术。 相似文献
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分析了双抽运光对多个信号光进行参量放大的物理过程,重点阐述了此过程中的四种串扰以及它们对信号光质量的影响,并对交叉增益调制对系统的影响进行了分析.全面综述了实验中发现的单抽运光与双抽运光放大多个波长信号光过程中的串扰问题,并对抑制串扰的办法进行了总结.如优化设计光纤参量放大器(FOPA)参数和利用不同偏振态的抽运光与信号光相互作用减小串扰等. 相似文献
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评述了基于光纤的光参量放大器的理论基础,介绍了这种器件在光通信领域的应用情况,最后展望了这一领域的研究前景. 相似文献
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阐述了基于光子晶体光纤(PCF)的光纤参量放大器(FOPA)的工作原理,对FOPA所需的PCF特性进行了讨论和设计.采用带混合节点/棱边元三角形单元的全矢量有限元法(FEM),计算了PCF中非线性系数、色散斜率和色散零点与空气孔半径、孔间距和空气填充比等结构参数间的关系.计算结果表明:在确保PCF光纤高非线性的前提下,通过灵活设计PCF的结构参数就可以实现色散控制,得到PCF的超宽波长范围内可调的零色散波长、近零超平坦色散和极低的色散斜率,从而为FDPA获得高增益、宽带宽等性能创造必要前提. 相似文献
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Liang ZHAO Junqiang SUN Zhefeng HU Qian HU Yujie ZHOU Jing SHAO Tianye HUANG Jun LI 《中国光电子学前沿》2010,3(3)
An insight into the signal gain in multiple four-wave mixing (MFWM) processes based on a cubic susceptibility medium is theoretically proposed and demonstrated. A dual-pumped fiber optical parametric amplification (FOPA) model is developed with the exact expressions for the signal gain and its 3-dB bandwidth successfully yielded. With these analytical expressions, we show that when pump-1 and pump-2 wavelengths tuned at 1549 and 1551.02nm, the 3-dB bandwidth of the signal gain can be achieved at about 2253.4nm theoretically by properly setting the pumped powers. Numerical simulations show that there is a small pinnacle emerging in the signal gain spectrum owing to the degenerate OPA process occurring. The proposed OPA model can find potential applications in all-optical wavelength conversion, optical amplifier, and all-optical sampling. 相似文献
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Laser sources which have high power, short time duration and are broadly tunable are needed for the application of ultra-fast lasers. Femtosecond optical parametric amplification (OPA) is one of the most important techniques to produce broadly tunable and several femtosecond laser pulses. To obtain an extremely short pulse, the femtosecond OPA should adequately support a large spectral bandwidth. Ultra-broadband type-Ⅰ phase matching OPA based on BBO was theoretically investigated. The achromatic phase matching (APM) technology was introduced to femtosecond OPA, and a broadband phase matching condition was given when the signal beams were angularly dispersed.The methods were presented to choose the optimized non-collinear angle and angular dispersion. Effects of non-collinear angle and rate of angular dispersion to the parametric bandwidth were also discussed. The results indicate that a proper non-collinear angle of the noncollinear optical parametric amplifier (NOPA) and getting signal beams dispersed at the right rate in nearinfrared conditions can increase the parametric bandwidth dramatically. 相似文献