摘要光纤延迟线可以为高性能雷达系统提供无偏斜、宽瞬时带宽的实时延迟波束控制。其重量轻、体积小，不易受电磁辐射的干扰，电噪声极低的优点非常适合机载或星载应用。相比使用光开关、棱镜或反射镜，以光纤光栅为核心的光纤延迟线体积更小、损耗更低。本文主要介绍了基于压电陶瓷调谐的啁啾光纤光栅光纤延迟线的结构和原理。分别测量了该光纤延迟线系统和光纤光栅的延迟时间。利用白光扫描干涉法对压电陶瓷伸长量与电压的关系进行了标定。标定了啁啾光纤光栅相对伸长量与反射光谱平移量之间的关系。实验结果表明，通过压电陶瓷调谐可以获得步长为0。11nm的反射光谱平移，理论延迟步长为1。64ps，精度为1。73ps。系统损耗小于3dB。实验不能分别准确测出该系统和啁啾光纤光栅的延迟时间。对该系统提出了优化方案。77160

毕业论文关键词  光纤延迟线  啁啾光纤光栅  压电陶瓷

毕业设计说明书外文摘要

Title  The Study on Opitcal Fiber Delay Line Based on Chirped   Fiber Gratings Tuned by Piezoelectric Ceramic                                               

Abstract Optical fiber delay line can provide high-performance radar system with wide-band squint-free real-time delay beam controlling。 Meanwhile, it is quite suitable for airborne or satellite-borne application because of its advantage of light weight, small size, immunity to electromagnetic interference and extremely low electrical noise。 Optical fiber delay line with fiber gratings at the core has smaller size and lower insertion loss compared with those using optical switch, prism or mirror。 In this paper, the structure and principle of the optical fiber delay line, based on chirped fiber gratings which is tuned by piezoelectric ceramic, has been proposed and analyzed。 The delay time of the optical fiber delay line system and the fiber grating has been measured respectively。 The relationship between the elongation of the piezoelectric ceramic and voltage has been calibrated by means of scanning white-light interferometry。 The relationship between the relative elongation and reflection spectra shifting of the chirped fiber grating has been calibrated。 The result of the experiments turn out that the step of the reflection spectra shifting of the chirped fiber grating tuned by piezoelectric ceramic can be obtained to 0。11nm。 The theoretical step of the delay time is 1。64ps and the precision of the delay time is 1。73ps。 The system loss is less than 3dB。 The experiment cannot measure the delay time of this system and the fiber grating respectively in the range of credibility。 The optimization of the system has been provided。

Keywords  Optical fiber delay line  Chirped fiber grating  Piezoelectric ceramic

目  录

1  绪论 1

1。1引言 1

1。2光纤延迟线 2

1。3光纤延迟线技术现状 3

1。3。1基于光开关或棱镜的光纤型延迟线 4

1。3。2基于光纤光栅的色散型延迟线 5

1。4本文研究内容 8

2  基于压电陶瓷调谐的光纤光栅延迟线结构设计 9

2。1光纤光栅 9

2。1。1啁啾光纤光栅 10

2。1。2啁啾光纤光栅调制理论