Polyimide-coated Ge-doped high-temperature-resistant single-mode fiber

Compared with ordinary single-mode optical fibers, this product uses a polyimide (PI) coating. Polyimide is a polymer material with excellent comprehensive properties, featuring high heat resistance, excellent dielectric properties, and good mechanical strength. It can greatly improve the temperature resistance of the optical fiber coating and extend the service life of the optical fiber in high-temperature environments.

Product features：High-temperature resistance 、Durability, high bending strength, and sealing performance 、Enables the welding of embedded optical fibers, fiber bundles, and pigtails into high-vacuum environments

Application area：High-temperature environments 、Harsh chemical environments 、Nuclear radiation environments 、High-power laser transmission 、Medical applications 、Optical fiber bundle welding

Unit Price

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Part Number

PI-SM1550

Lead Time

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Stock

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General Parameters

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Dimensional Drawing

Process Advantages

High-quality coating layer, no deformation at 300℃, adjustable coating thickness;

Our company uses a specially designed vertical online thermosetting process, which allows for a large adjustable range of coating thickness, good concentricity of the fiber coating layer, and a smooth coating surface that avoids stress concentration points, significantly improving the selection strength. At the same time, the curing is uniform, reducing glue residue. In our 300℃ high-temperature thermal shock test, the fiber does not bend or deform, maintaining excellent bending and tensile strength after prolonged high-temperature exposure;

High-speed preparation of low-loss optical fibers;

Polyimide, unlike acrylate light-curing methods, requires a thermosetting process that has a longer curing time, resulting in a slower fiber drawing speed compared to conventional acrylate drawing, which can increase fiber loss during the longer drawing process;

Based on the online continuous thermoplastic/thermosetting process with a longer fiber run and specially modulated PI coatings, our process can achieve excellent coating quality at higher drawing speeds, significantly improving the preparation efficiency of high-temperature resistant fibers and increasing the consistency of the fiber's geometric parameters. By applying multi-stage, multi-parameter PI materials, we achieve thicker PI coatings and lower single-mode fiber losses by adjusting the physical and chemical properties of the inner, middle, and outer layers of materials.

Industry Applications and Operating Environments

Medical industry; mining industry, oil and gas industry; aerospace industry, nuclear industry; chemical industry; optical communication industry; power industry; high temperature, high pressure, and low temperature environments; electromagnetic radiation environment; underwater use, resistant to hydrolysis; medical interventional therapy, with biocompatibility; can be ETO and radiation sterilized (pure silica core).

Parameter	Property
Cut-off wavelength	≤1260 nm
Mode Field Diameter	@1310 nm 9.2 ± 0.4 µm @1550 nm 10.4 ± 0.8 µm
Attenuation Coefficient	@1310 nm 0.7dB/km @1550 nm 0.7dB/km

Parameter

Delivery length	1 - 30 km
Cladding diameter	125 ± 1 µm
Coating diameter	155 ± 5 µm
Core-clad concentricity	≤0.6 µm
Cladding non-circularity	≤0.1
Coating material	Polyimide
Long-term operating temperature	-55 - 300 ℃
Short-term tolerance temperature	400 ℃
Screening strength	100 - 200 kpsi

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