长周期光纤光栅OCDMA编码系统

　　OCDMA是未来高速全光网通信网络的备选方案之一，是目前通信研究领域的热点。其中光编解码器是OCDMA系统中的关键技术。研究表明， LPG以其插入损耗小、波长编码、无后向散射、不受电磁干扰、兼容于光纤等优点，在光纤通信和传感领域均有重要的应用价值。基于长周期光纤光栅的各种优势，针对OCDMA编解码器的设计，通过optisystem及optigrating应用软件对长周期光纤光栅的耦合模式进行仿真，并通过搭建OCDMA系统模型，得出编解码结果。验证了用长周期光纤光栅做OCDMA系统的编解码器的可行性。

　　Abstract:

　　OCDMA is one of the schemes of the future high-speed optical communication network，and it is also a research hotspot.In OCDMA，codec is the key technology.Research shows that LPG have advantages:such as low insertion loss，wavelength coding，no back scattering，unaffected by electromagnetic interference，compatible with fiber etc.So it has an important application value in optical fiber communication and sensing technology.Based on this advantage，this paper discussed the codec technology and simulated the coupling model of long period fiber grating with the optisystem and optigrating application software.By constructing OCDMA system model，the decoding results were concluded，which verified the feasibility of using long period fiber grating as the codec of OCDMA system.