双信道解复用长周期光纤光栅的实验研究

Experimental study on long period fiber grating applied in two channel wavelength division demultiplexer

长周期光纤光栅是近几年出现的一种波长选择滤波器件。利用其波长选择损耗特性 ,提出将之用于1310nm/15 5 0nm波分复用系统的解复用。采用电弧熔融刻槽的方法 ,制备了长周期光纤光栅。并通过控制电弧放电过程和光栅的周期长短及周期数 ,得到了较为理想的谱特性。结果显示 ,其通道插入损耗能够小于 0 .5dB ,2 0dB损耗阻带带宽可达 15nm ,信道隔离度估计约 2 5dB。

A long period fiber grating(LPFG) is a wavelength seletive filter developed in recent years.According to its behavior of wavelength dependent loss,a LPFG is used as wavelength division demultiplexer for 1310nm/1550nm wavelength division multiplexing(WDM) system.By means of groove curving with electric arc discharge,several LPFGs are fabricated.Ideal spectra of LPFGs are obtained by controlling the process of electric arc discharge and the period and the length of LPFGs.The results show that insertion loss of pass channel is able to be less than 0.5dB,20dB loss bandwidth of rejection band is nearly 15nm,and that isolation of neighboring channel is about 25dB.