The sticking point of coupling space light into single-mode fiber is how to find the optimal position of fiber precisely.Based on the field-matching theory,the influence of the fiber position error on coupling efficiency of light from free space to single-mode fiber is numerically evaluated.The results show that the fiber-coupling efficiency degrades rapidly with the increasing of the fiber position error.We designed a fiber adjusting mechanism to position the fiber precisely,which improve the fiber-coupling efficiency greatly.To ensure a certain degree of coupling efficiency,micro-lenses fiber is also introduced into the coupling system.These results are helpful for optimization designs of coupling space light into single-mode fiber.
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陈海涛,杨华军,李拓辉,黄凯.光纤偏移对空间光-单模光纤耦合效率的影响[J].激光与红外,2011,41(1):75~78 CHEN Hai-tao, YANG Hua-jun, LI Tuo-hui, HUANG Kai. Influence of the fiber displacement on coupling light beam into single-mode fiber[J]. LASER & INFRARED,2011,41(1):75~78