IC693MDL758
IC693MDL758IC693MDL758光纖折射率選擇
現(xiàn)在使用的單模光纖的折射率基本在1.460 0~1.480 0范圍內,要根據(jù)光纜或光纖生產廠家提供的實際值來精確選擇。對于G.652單模光纖,在實際測試時若用1310 nm波長,折射率一般選擇在1.468 0;若用1550 nm波長,折射率一般選擇在1.468 5。折射率選擇不準,影響測試長度。
在式(1)中折射率若誤差0.001,則在50000 m的中繼段會產生約35 m的誤差。在光纜維護和故障排查時很小的失誤便會帶來明顯的誤差,測試時一定要引起足夠的重視。
【公 司】: 廈門泰尼電氣有限公司
【主 營】: AB、GE、施耐德等各類PLC產品
【價 格】: 電議
【發(fā)布人】: 張亮
【電 話】: 18030028083
【所在地】: 福建 - 廈門
【座 機】: 0592-6809819
【來 源】: 供應信息 > 電工、電氣 > PLC
【Q Q】: 2314094943
2.3 測試脈沖寬度選擇
設置的光脈沖寬度過大會產生較強的菲涅爾反射,會使盲區(qū)加大。較窄的測試光脈沖雖然有較小的盲區(qū),但是測試光脈沖過窄時光功率肯定過弱,相應的背向散射信號也弱,背向散射信號曲線會起伏不平,測試誤差大。設置的光脈沖寬度既要能保證沒有過強的盲區(qū)效應,又要能保證背向散射信號曲線有足夠的分辨率,能看清光纖沿線上每一點的情況。
一般是根據(jù)被測光纖長度,先選擇一個適當?shù)臏y試脈寬,預測試一兩次后,從中確定一個最佳值。被測光纖的距離較短(小于5 000m)時,盲區(qū)可以在10 m以下;被測光纖的距離較長(小于50 000 m)時,盲區(qū)可以在200 m以下;被測光纖的距離很長(小于2 500 000 m)時,盲區(qū)可高達2 000 m以上。
在單盤測試時,恰當選擇光脈沖寬度(50 nm)可以使盲區(qū)在10 m以下。通過雙向測試或多次測試取平均值,盲區(qū)產生的影響會更小。
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