中国激光, 2004, 31 (12): 1491, 网络出版: 2006-06-12
光纤耦合器上写入光栅制作滤波器的实验研究
All-Fiber Wavelength Selective Filter Based on UV-Written Bragg Grating in Conventional Fused Coupler
光纤光学 熔锥型光纤耦合器 布拉格光栅 滤波器 超模 fiber optics conventional fused tapered coupler Bragg grating filter supermode
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244 nm的紫外光在由康宁SMF-28光纤熔融拉锥制作的2×2 3 dB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20 dB,线宽大于1 nm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。
Abstract
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.
罗爱平, , , 瞿荣辉, 方祖捷. 光纤耦合器上写入光栅制作滤波器的实验研究[J]. 中国激光, 2004, 31(12): 1491. 罗爱平, Emmanuel Marin, Jean-Pierre Meunier, 瞿荣辉, 方祖捷. All-Fiber Wavelength Selective Filter Based on UV-Written Bragg Grating in Conventional Fused Coupler[J]. Chinese Journal of Lasers, 2004, 31(12): 1491.