多模光纤的弯曲损耗实验研究何国财（吉首大学物理科学与信息工程学院，湖南吉首416000）摘要：随着光通讯、光网络、光传感技术的发展，光纤已经被广泛应用于上述系统作为信息载体和敏感元件。多模光纤以其结构简单、芯径大、耦合效率高，损耗、色散较大而被广泛应用于小型局域网，局域网的铺设线路上往往弯曲较多。因此，研究弯曲对多模光纤所传输信号的衰减对于合理构建和铺设局域网是十分必要的。为此，我们实验研究了62.5微米芯径多模石英光纤在相同圈数不同弯曲半径和相同弯曲半径不同圈数情况下的弯曲损耗，得到了如下结论：（1）多模光纤弯曲时有一个4.5厘米到5厘米的临界值。（2）当弯曲半径大于临界值时，弯曲不对损耗产生影响，当弯曲半径小于临界值时，弯曲半径越小则损耗越大；（3）当弯曲圈数到一定程度时，弯曲圈数不影响损耗。关键词：多模光纤；弯曲损耗；弯曲半径ExperimentalstudyaboutlossofMulti-moldsopticalfiberinducingbybendingHeGuocai(CollegeofPhysicsScienceandInformationEngineering,JishouUniversity,Jishou,Hunan416000)Abstract：Alongwithdevelopmentoftheopticalcommunication,theopticalnetwork,theopticalsensortechnology,theopticalfiberwidelyisalreadyappliedtotheabovesystemastheinformationcarrierandthesensitiveunit.Multi-moldsopticalfiberhasbeenappliedwidelyintheLANforitssimplestructure,bigcorediameter,highcouplingefficiency,highlywasteandbigdispersion.ThelineofLANalwayshasmanybending,therefore,itisnecessarytoresearchthebendingwasteofthemulti-moldsopticalfiberforconstructingreasonablyandlayingdowntheLAN.Forthis，ithasbeenexperimentalstudythatthebendinglossof62.5-microns-cores-diametersmulti-moldssilicafiberhasthesamenumberofloopwithdifferentradiusandhasthesameradiuswithdifferentnumberofloop,obtainedthefollowingconclusion:(1)Themulti-moldsopticalfiberhaveamarginalwhenhascurving4.5centimetersto5centimeters.(2)Thewindingradiusisbiggerthanmarginal,itisnotinfluencelost.ThewindingradiusismoresmallthelostmorebigwhenthewindingradiussmallerthenⅠmarginal.(3)Windingnumbercircletocertaindegree,thewindingnumbercircledoesnotaffecttheloss.Keyword：Multi-moldsopticalfiber;windingwaste;windingradiusⅡ目录摘要…………………………………………………………………………………Ⅰ关键字………………………………………………………………………………ⅠAbstract……………………………………………………………………………ⅠKeywords……………………………………………………………………………Ⅱ1.绪论………………………………………………………………………………11.1引言…………………………………………………………………………………11.2光纤的发展历史、种类及用途……………………………………………………21.3本论文工作的目的、意义和主要内容…………………………………………82.光纤传输理论…………………………………………………………………………82.1光纤的模式理论…………………………………………………………………82.2光纤的光线理论…………………………………………………………………113.光纤传输特性……………………………………………………………………163.1光纤的损耗、色散和非线性……………………………………………………163.2光纤的宏弯损耗、微弯损耗和弯曲过渡损耗…………………………………194.多模光纤弯曲损耗的实验研究……………………………………………………234.1实验装置与实验方法……………………………………………………………234.2实验结果与分析………………………………………………………………245.结束语………………………………………………………………………………28参考文献…………………………………………………………………………………29致谢………………………………………………………...
