The simulation and experiments indicate that these two methods are simple , fast and accurate . a new optimal design of interleaves based on cascaded mach - zehnder interferometers is also presented . as compared with the two existing methods ( digital signal processing methods and fourier filters ) , the present method is simple and intuitive 本论文分析了mach - zehnder干涉仪级联形式之间的关系，提出了通带平坦化分叉复用器的新型设计方法，与现有两种方法(应用数字滤波器设计方法以及傅立叶展开法)相比较，本文提出的设计方法直观、简单。
( 5 ) based on mach - zehnder interferometer setup , slice - interferometry for measuring light - induced index changes in pr crystal is investigated . and employing digital holography for visualizations of the index changes in pr crystal is first proposed . additionally , the two approaches are used for measuring the index distributions of light - induced waveguides successfully 基于马赫-曾德干涉仪光路研究了利用切片干涉法测量光折变晶体中光致折射率变化的方法，并首次提出了利用数字全息术对光折变晶体中光致折射率变化进行可视化的方法。
The position of phase mask also can be used as a key of the system besides the phase codes . the key space is significantly enlarged , and high security is consequently achieved . finally , a method of binary image encryption with optical subtraction based on mach - zehnder interferometer architecture is proposed 最后,针对二值图像的特点,提出一种通过直接扰乱图像分布达到加密目的新方法,该方法不是用传统的相乘编码,而是把待加密二值图像与一块随机二值实振幅掩模通过光学图像相减技术来实现加密编码。
In order to design wavelength insensitive power splitter based on soi , the wavelength characteristic of mach - zehnder interferometer were investigated by means of bpm and fdm ( finite - difference method ) . then the parameters of mach - zehnder interferometer were optimum designed using genetic algorithm . besides , genetic algorithm is also used to optimize the upper tier parameters of mzi based silica - on - silicon to attain a flat spectral response 为了设计对波长不敏感的soi材料的mz功分器，利用束传播法( bpm )和有限差分模式解方法( fdm )对mach - zehnder结构的组成部分定向耦合器和相位延迟部分做了波长相关特性的计算，然后通过遗传算法优化设计了mach - zehnder的结构参数。
There are four types of fgc : fgc based on mach - zehnder interferometer , asymmetric fgc based on 100 % coupler , asymmetric fgc based on mismatched coupler and symmetrical fgc based on 100 % coupler . in this paper , symmetrical fgc based on 100 % coupler and fgc based on mach - zehnder interferometer are analyzed Fgc主要可以分为四类:基于mach - zehnder干涉仪结构的分离型fgc 、基于100 %耦合器的非对称型fgc 、基于0耦合器的非对称型fgc和基于100 %耦合器的对称型fgc 。
In view of the potential of mzi ( mach - zehnder interferometer ) sensing structures , useful features of arrow ( antiresonant reflecting optical waveguide ) and promising future applications of refractometers , mzi refractometers based on polymeric arrow structure are studied in this thesis 基于mzi ( mach - zehnderinterferometer )传感结构的巨大发展潜力， arrow ( antiresonantreflectingopticalwaveguide )波导的突出优点以及折射仪应用的广阔前景，本文对聚合物arrow结构的mzi折射率测量芯片进行了研究。
The demodulation method of fiber grating is the key method of fiber grating sensor . the main demodulation method includes : grating matching method , tunable fabry - perot cavity method , non - balance mach - zehnder interferometer method and tunable narrow - band light source method . the tunable fabry - perot cavity method is discussed in detail , and a demodulation system based on dsp is put forward 光纤光栅的解调技术是光纤光栅传感器的关键技术，本文讨论了光纤光栅的波长解调方法，包括匹配光栅法、可调谐f - p腔法、非平衡mach - zehnder干涉仪法和可调谐光源法等，详细分析了可调谐f - p滤波器的特性和解调原理提出了一种基于dsp的解调光纤光栅波长的可调谐法布里一珀罗腔解调方案。
The wavelength dependence of the directional couplers is modeled and with this model optimal designs of planar wavelength circuits based on mach - zehnder interferometers and their cascaded forms are presented . liquid crystals are widely used in optical information processing technologies . optical devices based on liquid crystals , such as variable optical attenuators ( voas ) , switches and tunable filters , have been introduced into the area of optical communications recently 在基于级联mach - zehnder干涉仪的宽带器件设计中，本论文建立了定向耦合器波长敏感性的近似模型，并在此基础上提出了通过对初始结构(即不考虑定向耦合器波长敏感性的设计结果)做微扰来确定宽带器件结构参数的设计方法。
