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OFSCN Global Teknik Merkezi OFSCN Teknik Bilgi Bankası
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Fiber optik ek yerlerine neden çelik tel takviyeli bir tüp takılır?

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Fiber optic splice protection sleeves, which are heat-shrinkable tubes with slender rigid components applied externally to the fusion splice point (or fiber Bragg grating splice point) in fiber optic communication and sensing engineering, are commonly referred to as Fiber Optic Splice Protection Sleeves. The “small tube with steel wire” contained within plays a crucial physical protection role in engineering.

I. Core Functions and Physical Principles

  1. Mechanical Strength Reinforcement
    After stripping and fusion splicing, the fiber optic cable loses its original coating and outer sheath. The bare fiber portion (only about 125\ \mu\text{m} in diameter) is extremely fragile and can easily break due to minor bending, stretching, or shear stress. The stainless steel wire (or ceramic rod/quartz rod) inside the heat-shrinkable tube acts as a skeleton. Together with the heat-shrinkable polyolefin tube and the hot-melt adhesive tube that tighten upon heat shrinkage, they form a rigid support structure, greatly enhancing the tensile strength and bending resistance of the splice point.

  2. Protecting the Splice Point from Environmental Corrosion
    The fiber optic splice point is fused using high-temperature arc discharge. Although the quartz glass composition is restored to continuity, the spliced area is highly sensitive to moisture, dust, and chemical corrosion. The interior of the heat-shrinkable tube is usually filled with hot-melt adhesive. During heating and shrinking, the adhesive melts and fills the voids, forming an excellent sealing layer after cooling. This effectively isolates moisture and chemical substances from the air, preventing hydrolytic aging or stress corrosion.

  3. Maintaining Optical Transmission Stability
    For precision fiber Bragg grating (FBG) sensor components or communication fiber optic links, even minor mechanical stress on the splice point can cause additional loss or alter the grating’s center wavelength ( \lambda_B ). The rigid fixation provided by the steel wire heat-shrinkable tube ensures that the geometry of the spliced area remains stable when subjected to external environmental temperature changes or slight vibrations, thereby guaranteeing the accuracy of optical signal transmission and sensing demodulation.

II. Related Engineering Application Products

Within the Beijing Dacheng Yongsheng Technology Co., Ltd. (OFSCN®) technology system, to provide ultimate mechanical protection and long-term reliability for optical fibers and splice points in harsh industrial and outdoor environments, optical cables or patch cords with integrated metal armor structures are often directly employed. Examples include:

These products also incorporate seamless stainless steel tubes or high-strength steel wire stranded structures (such as 0.6\text{mm} galvanized steel wire or 0.45\text{mm} stainless steel wire) in their structural design. The core design philosophy is similar to that of fiber optic splice protection sleeves: both use metal components to bear external loads, ensuring that the core optical fiber is protected in complex stress environments.