共查询到20条相似文献,搜索用时 187 毫秒
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基于空间频谱,对光谱色散匀滑(SSD)技术与衍射光学器件(DOE)联用的焦面光强分布进行了严格的理论分析。与光谱色散匀滑技术联用前后,衍射光学器件焦面光强分布均可转化为一系列不同频率、不同复振幅的正余弦函数的叠加。光谱色散匀滑技术对衍射光学器件焦面光强分布空间频谱进行调制,该调制不仅与光谱色散匀滑参数,还与衍射光学器件相位分布有关。该技术使得衍射光学器件焦面光强分布变得更平缓,但要获得良好的联用性能,需根据光谱色散匀滑参数进行衍射光学器件的优化设计。在某一给定的光谱色散匀滑参数条件下,进行了衍射光学器件的优化设计。结果表明,与光谱色散匀滑技术联用后,衍射光学器件对入射波前畸变的宽容度有较大提高。 相似文献
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建立了基于注入式PIN结构的亚微米硅基波导光学相位调制器模型,对该调制器模型的光学特性和电学特性进行了理论分析和仿真,确定了器件的单偏振单模条件。在此条件下,重点分析并讨论了在不同结构参数与掺杂条件下器件调制效率的变化特性。结果表明,通过减小外脊高、增大掺杂浓度、减小波导区到掺杂区的距离、增大掺杂深度等均可有效提高器件的调制效率。在此基础上确定了器件的最优结构参数,结果表明其相位调制效率可达到19rad·V-1·mm-1,3dB带宽大于1GHz,同时该调制器还具有结构紧凑、工作电压低、易于集成的优点。 相似文献
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多模干涉型集成光学器件研究进展 总被引:4,自引:1,他引:3
基于自镜像效应(SIE)的多模干涉(MMI)型集成光学器件是集成光学中具有广泛用途的重要器件。本文详细而系统地综述了近几年来MMI器在国内外的研究进展,特别是其在集成光学中的应用。 相似文献
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空间光调制器(SLM)是在空间域内对光分布的相位、偏振态、振幅或光强进行一维或二维的调制的器件,它是光学信息处理的系统中一个最基本的元器件。最初只是在电视显示或计算机屏幕显示中探索其应用。在全息术以及傅里叶光学得到发展之后,空间 相似文献
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40 Gbit/s reconfigurable photonic logic gates with XNOR, AND, NOR, OR and NOT functions are demonstrated, based on various nonlinearities of a single semiconductor optical amplifier (SOA), including four-wave mixing (FWM), cross-gain modulation (XGM) and transient cross-phase modulation (T-XPM). Detuning optical bandpass filters are employed to enhance the SOA modulation bandwidth. 相似文献
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Yifei Wang Qijun Sun Jinran Yu Nuo Xu Yichen Wei Jeong Ho Cho Zhong Lin Wang 《Advanced functional materials》2023,33(47):2305791
General-purpose computers usually use logic gate computing units based on complementary metal oxide semiconductors (CMOS). Due to the separate memory and computing units in Von Neumann architecture, data transmission requires great energy and time consumption. Developing novel neuromorphic devices and comprehensively investigating their logical computing mode are crucial to achieve high-performance and low-power neuromorphic computation. Here, a systematic summary of Boolean logic computing based on emerging neuromorphic transistors is presented. This summary encompasses logical operation modes, materials, device structures, and working mechanisms. The input mode of Boolean logic operation is classified into electrical input, optical input, and synergistic optical/electrical input. Besides, additional modulation strategies to construct programmable logic functions by electrical, optical, and thermal signals are also summarized. These strategies hold great significance as they enable dynamic reconfiguration of logic operations and provide neuromorphic devices with decision-making capabilities. Finally, the application prospects and current challenges to Boolean logic computing based on dendritic integration are discussed from the aspects of device integration, synergistic input/modulation modes, auxiliary peripheral circuit, software/hardware system, etc. It is believed that comprehensive investigations on neuromorphic Boolean logic operations are crucial to push forward the development of future neuromorphic computing toward high efficiency and high integration density. 相似文献
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This concise paper describes a single channel audio coder suitable for use in Picturephone audio transmission. Companding is carried out digitally by sequential elimination of levels from the linear scheme with equally spaced quantizing levels. The basic technique, called level elimination encoding is presented and analyzed. Then a level-at-a-time coder whose quantizer consists of a linear segment followed by a level elimination segment is presented and analyzed. This two-segment coder is simulated and compared with themu = 255 logarithmic coder. Finally system implementation is presented and discussed with respect to the required logic speed. 相似文献
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A general framework for the operation of a large class of quantum confined light modulators is offered, supported by a discussion of the theoretical background. The design of a quantum confined modulator for a specific host system allows a wide choice of modulation mechanism, geometrical design configuration and field-controlled optical parameter. In this short review, we discuss specific combinations of optical property, semiconductor material system and geometry suitable for selected digital and analogue applications. Excitonic optical effects are emphasised as providing electric-field control of both optical absorption and refractive index in multiple quantum well structures. Geometrical aspects are also discussed, including phase modulation in a horizontal waveguide configuration and absorption modulation in transmission and reflection-mode vertical modulators. Self electrooptic effect devices (SEEDs) figure prominently across the range of optoelectronic system components and are used to illustrate various modulator functions in lightwave logic operations and neural networks. 相似文献
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吴重庆 《激光与光电子学进展》2007,44(11):12-17
半导体光放大器(SOA)中非线性系数约为普通光纤的109倍,为光子晶体光纤的107倍.有4种光-光互作用,即交叉增益调制、交叉相位调制、交叉偏振调制和四波混频,可以灵活地组成各种光信号处理器件,如波长变换器、全光触发器、全光逻辑、全光时钟恢复、全光缓存器,正成为整个光信号处理的基础.介绍了这些技术的同时,分析当前应用的制约因素,指出半导体光放大器集成是下一步发展的必然趋势. 相似文献
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Chen H. Zhu G. Wang Q. Jaques J. Leuthold J. Piccirilli A.B. Dutta N.K. 《Electronics letters》2002,38(21):1271-1273
All-optical Boolean XOR logic using a differential phase modulation scheme of the semiconductor optical amplifier-based Mach-Zehnder interferometer (SOA-MZI) proposed and experimentally demonstrated. The scheme is tested at 10 Gbit/s with full duty cycle operation. The proposed method is attractive because the speed of operation is not limited by the carrier recovery time of the SOA. 相似文献