In optics communications , integrated diffraction grating devices based on the planar lightwave circuit ( plc ) technology are one of the most important solutions for the wavelength division multiplexing ( wdm ) technology 在光通信领域，基于平面波导技术的集成型衍射光栅器件在密集波分复用系统中以其优异的性能成为了波分复用器件的主要发展方向之一。
In the design of optically amplified links for wdm applications , in which the number and power level of the input channels may vary randomly in time as in a network scenario , it is thus essential to stablize the amplifier gain profile 但其增益谱并不平坦，这就要求用于波分复用系统的掺铒光纤放大器要有合适的增益、噪声系数和输出功率，还要求增益的动态平衡。
This work mainly studies the influence of cross phase modulation ( xpm ) on dwdm systems and schemes to suppress the influence . in addition , all - optical wavelength converter based on xpm in optical fiber is studied 本文主要研究密集波分复用系统中的一种重要的非线性效应? ?交叉相位调制对系统性能的影响及减小其影响的方法，并研究基于光纤中交叉相位调制的波长转换器。
C ) the noise mode was established for a large - scale array of fiber - optic hydrophones using tdm and wdm , and the methods were presented that suppress noises and enlarge dynamic range . d ) a scheme was given of constituting the very large - scale array composed of 512 3 、针对一个大规模光纤水听器时分波分复用系统,建立了噪声分析模型,为抑制系统噪声、扩大系统动态范围提供了科学的方法。
Erbium doped fiber amplifier ( edfa ) is a key component of optical communication . it can amplify all the signal in wdm system taking the places of an array of electronic regenerators , furthermore , it has advantages such as high gain , low noise and so on 掺铒的光纤放大器( edfa )是光通信中的重要元件，它可以对现有波分复用系统( wdm )中所有波长的光信号进行放大，从而代替了一组单波长放大器，而且edfa对光信号的放大具有高增益、低噪声等特点。
Photorefractive gratings are promising to be applied to wavelength division multiplexing ( wdm ) systems and electro - optic integration due to the advantages of small size , simple structure , easy erasing , high diffraction efficiency , low temperature sensitivity , narrow band filtering and so on 光折变光栅具有体积小、制作简单、易擦除、可以实时处理、衍射效率高、温度响应小、可以进行窄带滤波等优点，其在波分复用系统和光集成方面有着潜在的应用前景。
First , the growing history and the basic principle of the wdm optical networks are introduced , then the construct of the wdm all - optical networks is discussed , physical topology and logical topology and so on . then , the routing technology in wdm system is presented in this paper , as well as key optical components in optical networks . the routing and wavelength assignment issue in the optimal design of rwa algorithm is particularly explored 论文介绍了波分复用系统的原理、发展历程，讨论了wdm全光网体系结构、网络物理拓扑和逻辑拓扑，光交换/光路由等技术和关键器件，着重研究波长路由型全光网优化设计中的路由和波长分配问题。
The amplitude fluctuation and according system performance degradation induced by xpm is also studied through numerical simulation . the timing jitter caused by xpm can also have great impact on system performance . by employing lagrangian variational method and statistical method , the timing jitter caused by xpm in strong dispersion managed rz systems is studied in chapter 3 通过仿真也研究了波分复用系统中由于交叉相位调制效应引起的幅度抖动从而导致系统性能的恶化；交叉相位调制引起的时间抖动对系统性能也有较大影响，利用拉格朗日变分方法和统计分析的方法，第三章讨论了强色散管理归零码系统中交叉相位调制引起的时间抖动。
Liquid crystal tunable filters as an important device of wavelength division multiplexing and dense wavelength division multiplexing systems is caused attention by research department , especially many foreign research institute are studying it . but in our country its study is lag . and normal incidence of the crystal is almost the case , because the liquid crystal box is very thin , the field angle may be large and the pose of liquid crystal box may have impact on the measuring result . so , study in such subject , especially the liquid crystal box ' s position angle , is academic and valuable 各种改进液晶电光可调谐滤光片的措施的实现，使得液晶调谐滤光片成为一种很有应用前景的电光调谐滤光片，特别是用于光纤通信中的波分复用系统和密集波分复用系统，将使光纤的传输客量大大增加目前国外在这方面的研究进展很快，而国内在这方面的研究比较薄弱，而且通常采用光线正人射晶体进行研究，由于液晶盒很薄，视场角可以很大，液晶盒的摆放对测量结果影响很大，因此对该器件进行深入的研究，讨论液晶盒的方位角影响是很有必要的。
Hi accordance with the physical principle of dispersion generation , many kinds of technologies of dispersion compensation have been researched and expounded . for instance , dispersion compensation fiber technology , pre - chirpped technology , dispersion supported transmission technology , chirpped fiber grating technology , and so on . but the study of dispersion compensation technology in which the dispersion of the optical signal in every channel in the wdm system is compensated respectively is reported rarely 针对色散的物理机理，人们研究并提出了各种色散补偿技术，如色散补偿光纤法、预啁啾法、色散支持传输法和啁啾光纤光栅法等，而对波分复用系统中各分波光信号分别进行有针对性的色散补偿的研究报导还很少。
