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分析了基于等效相移(EPS)技术的超结构光纤光栅(SSFBG)相位编/解码器的原理及特点,提出并实现了一种双边带编/解码器。该编/解码器在不改变光纤光栅长度的前提下,实现了+1级和+3级编解码谱的级联,并很好地继承了等效相移技术所具有的设计灵活、制作精度低和与波分复用(WDM)系统兼容能力强等诸多的优点。理论及实测数据仿真结果均表明,在光脉冲源匹配最佳的前提下,双边带编/解码器较传统等效相移编/解码器而言,使得基于该光纤光栅相位编/解码器的窄带相干光码分多址(OCDMA)系统的编解码性能提高了3 dB,通过对比分析得到其本质原因在于双边带编/解码器结构提高了其单位长度内携带的相位信息量。
The principle and characteristics of SSFBG encoder / decoder based on equivalent phase shift (EPS) technique are analyzed. A double-band encoder / decoder is proposed and implemented. The encoder / decoder realizes the concatenation of the +1 + level and the +3 level codec spectrum without changing the length of the fiber grating, and inherits the advantages of equivalent phase shift technology such as flexible design and manufacturing precision Low and WDM system compatibility and many other advantages. The simulation results of the theoretical and experimental data show that compared with the traditional equivalent phase shift coder / decoder, the double-sideband encoder / decoder makes the best performance of the optical pulse source based on the fiber grating phase encoder / decoder The codec performance of the OCDMA system is improved by 3 dB. The essential reason for the OCDMA system is that the double-sideband coder / decoder structure increases the amount of phase information carried in its unit length.