光纖通訊熱收縮套管

光纖熱縮保護管工作機理

光纖熱縮保護管工作機理

在光纖接頭處,通常是一根光纖(光纖帶光纜除外)使用一個光纖熱縮保護管進行保護

光纖熱縮保護套管主要用於單芯光纖接續的裸纖部分,內管為熱熔管,中間襯加強件,外管為透明的熱收縮管,如圖1所示。加強件一般為不銹鋼捧、石英捧或陶瓷捧。

當加熱時,熱熔管熔化,緊緊地包裹住熔接後的光纖接頭,達到填充和密封的作用;加強件起到支撐作用和抗拉抗彎作用;熱縮管受熱收縮,將光纖接頭、熱熔管和加強件緊緊包裹,形成一個整體,增加光纖接頭部分的機械強度,同時防止潮氣侵入,從而維持光纖傳輸性能的長期穩定。
    在用光纖熱縮保護管對光纖進行保護時應注意:
    (1)避免保護管內有殘留氣泡,以保證光纖接頭的溫度特性和長期可靠性;
    (2)光纖要施加一均勻張力,以保證光纖在保護管中處於直線狀態;
    (3)避免光纖扭絞,防止微彎造成損耗增大;
    (4)施加的張力不能很大,避免光纖裂紋增加出現損害;
    (5)光纖熱縮保護管完全收縮、冷卻並定型後再釋放張力,以避免光纖局部受熱不均勻出現微彎或宏彎。

Working mechanism of fiber heat shrink protection tube

At the fiber connector, usually a fiber (except fiber-optic cable) is protected with a fiber-optic heat-shrinkable tube.

The fiber heat-shrinkable protective sleeve is mainly used for the bare fiber portion of the single-core optical fiber. The inner tube is a hot-melt tube, the middle lining reinforcement member, and the outer tube is a transparent heat-shrinkable tube, as shown in FIG. The reinforcing members are generally stainless steel, quartz or ceramic.

When heated, the hot melt tube melts and tightly wraps the welded fiber optic connector to fill and seal; the reinforcing member acts as a support and tensile and bending resistance; the heat shrinkable tube is heat shrunk, and the fiber joint is The hot melt tube and the reinforcing member are tightly wrapped to form a whole, which increases the mechanical strength of the fiber joint portion while preventing moisture intrusion, thereby maintaining long-term stability of the fiber transmission performance.


Pay attention to the protection of the fiber when using the fiber heat shrink protection tube:
(1) Avoid residual air bubbles in the protection tube to ensure the temperature characteristics and long-term reliability of the fiber joint;
(2) A uniform tension is applied to the optical fiber to ensure that the optical fiber is in a straight line in the protective tube;
(3) Avoid twisting the fiber and prevent the loss caused by microbending;
(4) The applied tension should not be large to avoid damage caused by the increase of fiber cracks;
(5) When the fiber heat-shrinkable protection tube is completely shrunk, cooled and shaped, the tension is released to avoid microbending or macrobending of the localized heat of the fiber.