单模光纤窄带波分复用器的研究

由组合波导理论出发，分析了超长耦合器合区光纤间的功率耦合特性以及器件的偏振特性，并提出了研制二段窄波分单模光纤波发复用器的新方法，在研制常规耦合器的工艺基础上，先后研制成功１３１０ｎｍ或１５５０ｎｍ单窗口窄带波分复用器及１３１０ｎｍ或１５５０ｎｍ双窗口等三种复用间隔约１４ｎｍ的窄带波分复用器，其波长隔离度大于２０ｄＢ，具有２～３ｎｍ的带宽，偏振灵敏度小于０．１ｄＢ，附加损耗小于０．５ｄＢ，这些参数     

短程透镜-光栅型集成波分复用器

制备了一种短程透镜——光栅型集成光学波分复用器。本文简述了波分复用器的原理和制备工艺,描述了其中的关键元件光波导光栅和光波导透镜的设计及特性测量,给出了波分特性的实验结果.     

四通道实时联合变换相关器

提出把光学波阵面分割复用器用于单通道实时光电混合联合变换相关系统实现四通道实时相关，使单通道系统扩展为具有多个独立通道的系统，使系统的容量和处理速度提高数倍，使系统的性能得以改善。给出了新系统的设计方案、工作原理和实验结果。     

阵列波导光栅设计原及优化

本文从波导光学和衍射光学理论出发，推导出阵列波导光栅（Arrayed-Waveguide Gratings）型波分复用器的重要结构参量；针对其性能参量，提出了一些优化设计方法。     

聚合物微型谐振环波分复用器

研制出用于现代光通信密集波分复用（DWDM）系统的微型谐振环波分复用器（MRRWM）。微环与信道波导采用垂直耦合的方式,利用耦合模理论对器件参数进行了优化设计,设计出模板,并研制出符合器件光学性能要求的聚合物材料。利用反应离子刻蚀技术完成了硅基板上单级和八级的器件制作,波分复用器的中心波长为1．55μm,输出波长间隔Δλ=1．6nm,中心微环半径R=131．95μm,相邻微环半径差ΔR=500．0nm,器件测试结果表明实现了微环谐振输出。     

阵列波导光栅设计原理及优化

本文从波导光学和衍射光学理论出发,推导出阵列波导光栅(Arrayed-Waveguide Gratings)型波分复用器的重要结构参量;针对其性能参量,提出了一些优化设计方法.     

光纤马赫—陈德尔干涉型8波分超窄波分复用器的研制

报道了采用７个单模光纤马赫－陈德尔干涉仪进行三级串联而组成的８波分复用器，既保留了干涉型光纤波分复用器超窄波分复用间隔的优点，又消除了其复用路数少的缺点。文中介绍了这类波分复用器的原理、设计方法和制造技术。实验样品的使用波段为１．５μｍ，波长复用间隔为２．４ｎｍ，整个器件的附加损耗约为１．５ｄＢ。     

光通信中的光电子器件讲座第四讲 光通信中的波分复用技术及关键器件的原理和应用

通信业务的爆炸式发展，使得通信网络对传输容量要求急剧提高。WDM（wavelength divsion multiplexing）技术是增加系统容量的有效方法。文章介绍了光通信中波分复用技术的基本原理和特点以及波分复用技术中所用的关键器件－波分复用器／解复用器。     

利用多模干涉效应集成0.98μm/1.55μm波分复用器及掺铒光信号放大器

波分复用器（ＷＤＭ）作为光纤通信中一种重要的元器件，能够在不改变原有通信线路的条件下，有效地增加光纤通信的容量。传统的波分复用器主要基于色散原理，分光比不能准确控制，信号间串音大；而基于平面波导中多模干涉效应研制的波分复用器，具有体积小，损耗低（＜０５ｄＢ），不受光偏振态的影响，易集成等优点；在很宽的工作波长范围内，受环境变化影响小，适合现代通信器件集成化的发展。利用多模干涉效应（ＭＭＩ）集成的０９８μｍ／１５５μｍ波分复用器，波导长度仅几个毫米，分光比例准确，隔离度可达３０－４０ｄＢ，波形失真小，它不仅可用于１５５μｍ光纤激光器和ＥＤＦＡ的集成，也可用于实现１×Ｎ和Ｎ×Ｎ分光，在光纤通信中有广泛的应用前景。     

利用改进的熔融拉锥法制备单模光纤波分复用器

研究了熔融拉锥光纤型波分复用器制备过程中各相关参量对其最小信道间隔的影响。并根据理论模拟的结论设计了新型的熔融拉锥装置,其中加热装置为有较长均匀加热区域的条形加热炉,使熔融拉锥光纤型波分复用器的耦合长度显著加长,改善了传统拉锥方法对这一类型波分复用器可达到的最小信道间隔的限制,得到了初步实验结果,最小信道间隔达到3.01 nm。     

Multitarget Detection Using a Hybrid Optical Joint Transform Correlator with Power Spectrum Subtraction

Multitarget detection using a hybrid optical joint transform correlator with power spectrum subtraction is proposed. This architecture is a programmable single spatial light modulator joint transform correlator. It consists of a liquid crystal display panel, an imaging lens, and a liquid crystal light valve to enhance resolution and space-bandwidth production. In this technique, it has two joint images in the input plane. In the second joint image, the reference image is contrast-reversal. With this technique, the second joint power spectrum is subtracted from the first joint power spectrum and the subtracted joint power spectrum is then taken the inverse Fourier transform. This technique is found to yield better correlation output performance than that of the classical joint transform correlator. Computer simulation results and the optical experimental results for input scene of the multitarget are given.The results have verified the correctness of the system design and performance analysis.     

Multitarget Detection Using a Hybrid Optical Joint Transform Correlator with Power Spectrum Subtraction

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修正振幅调制的光电混合圆谐联合变换相关器作旋转不变的目标检测

提出一种修正振幅调制的光电混合圆谐联合变换相关器作旋转不变的目标检测的实验系统。参考图像（即圆谐展开分量的实部和虚部）、圆盘状的局部偏置函数以及目标图像同时显示于输入面。此方法对联合功率谱作了修正,先将联合功率谱减去纯输入景物（含局部偏置函数）的功率谱和参考图像（含局部偏置函数）的功率谱,再加上局部偏置函数的功率谱,然后将所得修正的联合功率谱乘以振幅调制滤波函数。这种方法能产生比普通的圆谐联合变换     

Rotation invariant Target Detection Using a Hybrid Optical Circular Harmonic Joint Transform Correlator with DC Bias

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Image displacement based on phase-encoded reference joint fractional transform correlator

In order to utilize the space of an input plane efficiently and make the optical structure more flexible, an image displacement measurement based on phase-encoded reference joint fractional transform correlator (PER-JFrTC) is proposed. We use a random phase mask to encode the reference image and overlay it with the target image forming the input image. Joint power spectrum (JPS) of the input image is obtained by Fourier transform and the resultant is encoded by the same phase mask. Then a fractional Fourier transform with an order p is applied to the phase-encoded JPS (PJPS), resulting in a correlation output with a sharp cross-correlation peak, which includes the displacement information between the reference and the target image. Contrast to displacement measurement based on traditional joint transform correlator (JTC), PER-JFrTC can use the space of the input plane efficiently and reduces the influence of the auto-correlation. Also the position of cross-correlation peak can be fixed arbitrarily according to the fractional order p as well as the optical set-up can be more flexible and easier to implement. Results based on digital computation show that PER-JFrTC could detect the displacement accurately and verify our proposal. A possible optical set-up is suggested.     

实时光电混合联合变换相关器单元的实验研究

本文根据联合变换相关的原理，提出了一种实时光电混合联合变换相关器，它采用一个液晶光阀作为输入器件，用另一个液晶光阀记录和显示联合功率谱，所给出的实验结果证实了该系统设计及性能分析的正确性。     

Enhanced Optical Image Verification Based on Joint Transform Correlator Adopting Fourier Hologram

In this paper two new architectures for optical image verification are proposed. Both architectures are based on conventional joint transform correlators (JTCs) adopting a Fourier hologram and can significantly improve the recovered image quality. First, an input phase-only function is Fourier transformed and then interferes with a reference wave that is diffracted from a plane wave incident on another random phase mask. Second, two phase-only functions are placed at the two input sides of a beamsplitter such that the interference pattern of their Fourier transforms can be detected. To obtain a predefined target image in the output plane, one of the input phase functions is iteratively retrieved by the use of the projection onto constraint sets algorithm. Simulation results show that the less mean squared error and better image quality are obtained for both the binary and grayscale images.     

基于联合变换相关器的Dempster-Shafer理论计算

提出了用联合变换相关器(JTC)来实现证据理论概率分配函数正交和的光学计算,在理论上对于如何用联合变像相关器实现证据理论分配函数正交和作了详细的讨论,并作了相应的仿真测试,结果显示该方法是可行的。与John Caulfield提出的用声光器件矢量外积实现的正交和计算相比,在该结构中由于采用二进制编码的数值计算,因此其计算精度得到了提高,同时对联合变换相关器输入端二进制编码的数值空间位置的适当调整可以直接得到所需要的证据理论正交和矢量,在处理步骤上得到了简化。     

新型平面集成光学相关器设计与分析

基于微光学与二元光学技术,设计了一种新型的平面折叠式光学相关器,将相关器中组成4f系统的傅里叶变换透镜、全息匹配滤波器、输入面和输出集成到一个平面器件上,与另一平面偏振反射镜构成一个反射型的平面光学系统.讨论了相关器的系统结构设计、系统参数的设计,给出了具体的设计模型,计算出其体积可减小至约12 cm3.利用菲涅耳衍射数值模拟方法对系统的图像识别过程进行了仿真,得到了良好的相关输出结果,证实平面集成光学相关器具有很好的识别性能.