IC693MDL733
IC693MDL733IC693MDL733
非反射事件
這種情況比較多見,曲線中間出現(xiàn)一個明顯的臺階,多數(shù)為該纖芯打折,彎曲過小,受到外界損傷等因素。曲線中的這個臺階是比較大的一個損耗點,也可以稱為事件點,曲線在該點向下掉,稱為非反射事件,如果曲線在該點向上翹的話,那就是反射事件了,這時,該點的損耗點就成了負值,但并不是說他的損耗小了,這是一種偽增益現(xiàn)象,造成這種現(xiàn)象的原因是由于接頭兩側(cè)光纖的背向散射系數(shù)不一樣,接頭后光纖背向散射系數(shù)大于前段光纖背向散射系數(shù),而從另一端測則情況正好相反,折射率不同也有可能產(chǎn)生增益現(xiàn)象。所以要想避免這種情況,只要用雙向測試法就可以了。
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公司 名稱:廈門泰尼電氣有限公司
固定 電話:0592-6809819
聯(lián) 系 人:張亮
傳 真:0592-6890859【請備注“張亮”收】
商 務(wù) Q Q: 2314094943
手 機:18030028083
Q Q 郵 箱:2314094943@qq.com
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公司地址:廈門市海滄區(qū)海滄街道濱湖一里7號2008室
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光纖存在斷點
這種情況一定要引起注意!曲線在末端沒有任何反射峰就掉下去了,如果知道纖芯原來的距離,在沒有到達纖芯原來的距離,曲線就掉下去了,這說明光纖在曲線掉下去的地方斷了,或者也有可能是光纖在那里打了個折。我們經(jīng)常用這個原因,在線路上排障的時候,把不能確定的纖芯打折,然后測試人員利用 OTDR 打時實監(jiān)測,按照圖中的這種情況來判斷纖芯。
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