The spectral characteristics of a long period fiber grating is analyzed by using the coupled mode theory.
本文应用耦合模理论分析了长周期光栅的光谱特性。
2
The prediction precision of spectral analysis is very low, but the main period variations can be determined.
用谱分析进行钟差预报的精度不高，但可以发现钟差时间序列中的主要周期变化；
3
The cryptic period of the hydrologic time series of tidal reaches of the Yangtze River and Xijiang River are analyzed with the applying of spectral analysis and the result is reasonable.