多模光纖彎曲損耗

1、多模光纖的彎曲損耗實(shí)驗(yàn)研究 多模光纖的彎曲損耗實(shí)驗(yàn)研究何國(guó)財(cái)（吉首大學(xué)物理科學(xué)與信息工程學(xué)院，湖南 吉首 416000）摘 要：隨著光通訊、光網(wǎng)絡(luò)、光傳感技術(shù)的發(fā)展，光纖已經(jīng)被廣泛應(yīng)用于上述系統(tǒng)作為信息載體和敏感元件。多模光纖以其結(jié)構(gòu)簡(jiǎn)單、芯徑大、耦合效率高，損耗、色散較大而被廣泛應(yīng)用于小型局域網(wǎng)， 局域網(wǎng)的鋪設(shè)線路上往往彎曲較多。 因此，研究彎曲對(duì)多模光纖所傳輸信號(hào)的衰減對(duì)于合理構(gòu)建和鋪設(shè)局域網(wǎng)是十分必要的。為此，我們實(shí)驗(yàn)研究了 62

2、.5 微米芯徑多模石英光纖在相同圈數(shù)不同彎曲半徑和相同彎曲半徑不同圈數(shù)情況下的彎曲損耗，得到了如下結(jié)論： （1）多模光纖彎曲時(shí)有一個(gè)4.5 厘米到 5 厘米的臨界值。 （2）當(dāng)彎曲半徑大于臨界值時(shí)，彎曲不對(duì)損耗產(chǎn)生影響，當(dāng)彎曲半徑小于臨界值時(shí)，彎曲半徑越小則損耗越大； （3）當(dāng)彎曲圈數(shù)到一定程度時(shí)，彎曲圈數(shù)不影響損耗。關(guān)鍵詞：多模光纖；彎曲損耗；彎曲半徑Experimental study about loss of Multi- mo

3、lds optical fiberinducing by bendingHe Guocai(College of Physics Science and Information Engineering, Jishou University, Jishou, Hunan 416000)Abstract Abstract： Along with development of the optical communication, the op

4、tical network, theoptical sensor technology, the optical fiber widely is already applied to the above systemas the information carrier and the sensitive unit. Multi-molds optical fiber has beenapplied widely in the LAN f

5、or its simple structure, big core diameter, high couplingefficiency, highly waste and big dispersion. The line of LAN always has many bending,therefore, it is necessary to research the bending waste of the multi- molds o

6、ptical fiber forconstructing reasonably and laying down the LAN.For this，it has been experimental study that the bending loss of 62.5-microns-cores-diameters multi-molds silica fiber has the same number of loop with diff

7、erent radiusand has the same radius with different number of loop, obtained the following conclusion:(1) The multi- molds optical fiber have a marginal when has curving 4.5 centimeters to 5centimeters. (2) The winding ra

8、dius is bigger than marginal, it is not influence lost. Thewinding radius is more small the lost more big when the winding radius smaller thenⅠ目 錄關(guān)鍵字………………………………………………………………………………ⅠAbstract ……………………………………………………………………………ⅠK

9、eywords ……………………………………………………………………………Ⅱ1. 緒論 ……………………………………………………………………………… 11.1 引言…………………………………………………………………………………11.2 光纖的發(fā)展歷史、種類及用途……………………………………………………21.3 本論文工作的目的、意義和主要內(nèi)容………………………………………… 82. 光纖傳輸理論 ……………………………………………………

10、……………………82.1 光纖的模式理論 ………………………………………………………………… 82.2 光纖的光線理論………………………………………………………………… 113. 光纖傳輸特性 …………………………………………………………………… 163.1 光纖的損耗、色散和非線性…………………………………………………… 163.2 光纖的宏彎損耗、微彎損耗和彎曲過(guò)渡損耗 …………………………………194. 多模光纖彎曲損耗的實(shí)驗(yàn)研究

11、 …………………………………………………… 234.1 實(shí)驗(yàn)裝置與實(shí)驗(yàn)方法…………………………………………………………… 234.2 實(shí)驗(yàn)結(jié)果與分析 ……………………………………………………………… 245. 結(jié)束語(yǔ) ……………………………………………………………………………… 28參考文獻(xiàn)………………………………………………………………………………… 29致謝……………………………………………………………………………………… 30摘要