How does this needle-like metal protective layer safeguard the internal optical fiber?
The “micro-tube” structure refers to the use of a high-precision, seamless stainless steel tube (often with an outer diameter as small as 0.6mm to 0.9mm) as the primary protective layer for the internal optical fiber.
This needle-like metal layer safeguards the internal fiber through several mechanical and physical mechanisms:
1. Lateral Pressure and Crush Resistance
Unlike traditional plastic-jacketed patch cords, the seamless steel tube provides extreme compressive strength. For example, the OFSCN® 2.0mm Micro Steel Armored Fiber Optic Patch Cord can withstand high lateral pressure (compressive strength > 240 MPa), preventing the fiber from being crushed or micro-bent in harsh industrial environments.
2. Physical Barrier Against Sharp Objects
The “needle-like” hardness of the stainless steel tube acts as a permanent shield against sharp objects, tools, or environmental debris that would easily pierce or cut through Kevlar and PVC jackets. It effectively prevents “macrobending” and physical severance of the fiber.
3. Tension Decoupling
In many of these designs, the optical fiber is placed loosely inside the micro-tube. When the cable is pulled, the metal tube (often reinforced with additional layers in products like the OFSCN® 3.0mm Steel Wire Rope Fiber Optic Patch Cord) bears the tensile load, ensuring the delicate glass fiber remains unstressed.
4. Rodent and Environmental Protection
The metal structure is inherently rodent-proof, as animals cannot bite through the stainless steel. It also provides a barrier against moisture and chemical ingress that could degrade the fiber over time.
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For high-temperature applications where standard protection fails, this structure is also used in the OFSCN® 300°C Seamless Steel Tube Fiber Cable, where the metal tube replaces all flammable plastics to ensure signal integrity at extreme temperatures.
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