摘要
全光纤波长选择滤波器是光纤通信系统中的重要器件,其中将光栅写在光纤耦合器的耦合区上构成的波长选择滤波器结构紧凑、插入损耗小、费用低。报道了采用波长为244nm的紫外光在由康宁SMF-28光纤熔融拉锥制作的2×23dB耦合器上写入光栅的实验,在耦合器熔锥区的适当位置写入一定长度的布拉格光栅,可以实现全光纤多端口波长选择滤波器。实验中获得了最大反射率约为20dB,线宽大于1nm的滤波器,并采用超模理论对实验结果进行了定性分析。要获得高的下载效率,必须仔细控制写入光栅的位置和平移台的移动速度。
All-fiber wavelength-selective filters are the key components in fiber communication systems, those based on fiber couplers incorporated with Bragg gratings are compact, low insertion loss and low cost. In this paper, the filter based on 244 nm ultraviolet-written Bragg grating in hydrogen-loaded conventional 2×2 3-dB fused coupler is reported. It exists an optimized position and appropriate length of grating to obtain high reflectivity from drop port. The filter with maximum reflectivity about 20 dB, bandwidth larger than 1 nm is obtained. The results are qualitatively analyzed with supermode theory. In order to obtain high drop efficiency, the position of the grating and the speed of the step motor should be carefully controlled.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2004年第12期1491-1494,共4页
Chinese Journal of Lasers
