IC693TCM303
IC693TCM303IC693TCM303
色散主要用色散系數D(λ ) 表示。色散系數一般只對單模光纖來說,包括材料色散和波導色散,統稱色散系數。
光纖色散系數的定義:每公里的光纖由于單位譜寬所引起的脈沖展寬值,與長度呈線性關系。
其計算公式為 :
【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
其中:δλ 為光源的均方根譜寬,D(λ ) 為色散系數,L 為長度,現在的單模光纖色散系數一般為20ps/km.nm ,光纖長度越長,則引起的色散總值就越大。色散系數越小越好,,因色散系數越小,根據上式可知,光纖的帶寬越大,傳輸容量也就越大。所以,傳輸2.5G 以上光信號時,要考慮光纖色散對傳輸距離的影響,最好采用零色散的G.653 光纖傳輸,但光纖色散為零時,傳輸WDM 波分光信號會產生四波混頻等非線性效應,所以色散要小,但不能為零,最終采用的光纖為G.655 光纖來傳輸10G 的光信號和WDM 波分復用信號。對于單模光纖,其帶寬系數在25GHz.km 以上,但多模光纖的帶寬系數一般在1GHz.km 以下。所以,多模光纖一般用于622M 以下短距離的通信,而單模光纖可用于多種速率的通信。 LOT OF 55 - SGI - SDRAM 030-0781-001
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