Research On Slow Light Delay Measurement

Recent years, optics takes more and more important part in people's lives as information carriers. But in storage and buffer technique area, optical information technique fails to keep up a pace. In order to store optical information, optical signals always need to be transfer into electrical signals, which not only lose the information of phase and polarization, but also limit in transfer date rate.This work is partially supported by National Natural Science Foundation of China - optical buffer research based on high nonlinear fiber grating. The article is composed of 6 chapters. At first, contents and significances of research are introduced in chapter 1. And then, some kinds of slow light system are introduced in chapter 2. In chapter 3, the production of solution is described because the optical source in this project needs to be ultra-short laser pulses. In chapter 4, the theory about parameter measurement of ultra-short laser pulses is described. Chapter 5 proposes an all-fiber autocorrelation technique based on FWM used to measure propagation delay of femtosecond laser pulses in a specimen and establishes a measurement system based on this technique. This measurement system is tested by simulation software - OptiSystem to demonstrate its feasibility, and go along with numerical analysis by Matlab. The delay of a short fiber is measured, and the simulation measurement result shows the delay of the short fiber is 300fs. An experiment and analysis of the data are included. In the last chapter, and the experiment result shows that the fiber grating's reflected wavelength will changed according to different power of incident light.