Lee Jong-Moo, Kim Kap-Joong, Kim Gyungock
Electronics and Telecommunications Research Institute, 161 Gajong-dong, Yusong-gu, Daejeon 305-350, Korea.
Opt Express. 2008 Aug 18;16(17):13024-31. doi: 10.1364/oe.16.013024.
We fabricate a 20 um wide grating coupler for a single-mode thermally-expanded-core (TEC) fiber, in order to enhance positional tolerance in alignment. The minimal coupling loss is measured at 5 dB per facet and the optical 3 dB bandwidth is measured at 40 nm. The 3 dB alignment tolerance is measured at +-7.5 microm in horizontal direction and +290 microm in vertical direction. The 1 dB alignment tolerance is measured at +-4.2 microm in horizontal direction and +125 microm in vertical direction. The alignment tolerance is enhanced twice in horizontal direction and four times in vertical direction, compared with the coupling of a standard single-mode fiber to a standard 10 microm wide grating coupler which is also fabricated in this experiment.
我们为单模热膨胀芯（TEC）光纤制作了一个20微米宽的光栅耦合器，以提高对准中的位置公差。测得的最小耦合损耗为每面5分贝，光学3分贝带宽为40纳米。3分贝对准公差在水平方向上测得为±7.5微米，在垂直方向上为+290微米。1分贝对准公差在水平方向上测得为±4.2微米，在垂直方向上为+125微米。与本实验中制作的标准单模光纤与标准10微米宽光栅耦合器的耦合相比，对准公差在水平方向上提高了两倍，在垂直方向上提高了四倍。
