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

Polyimide is a polymer material with excellent high-temperature and low-temperature resistance, good mechanical strength, and overall superior performance. It greatly improves the temperature resistance of fiber coating, extending the fiber's lifespan in high-temperature environments while maintaining good mechanical performance without brittleness in low-temperature environments. Polyimide is a self-extinguishing polymer with a low smoke rate, a thermal expansion coefficient close to quartz materials, and certain self-lubricating properties. It can resist aging, withstand high-pressure electrical breakdown, and has minimal outgassing in ultra-high vacuum environments. Polyimide also has high radiation resistance, maintaining good strength in irradiated environments, with high tensile, bending, and compression strength, as well as excellent creep resistance and dimensional stability. Polyimide is non-toxic, stable, and biocompatible, making it suitable for the production of kitchenware and some medical consumables. It is also resistant to almost all organic solvents, certain inorganic acids, and hydrolysis.

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).

Parameters

PN#	SM9/125/155PI	PSC_SM9/125/155PI
Numerical Aperture (NA):	0.12 - 0.14	0.13-0.15
Mode Field Diameter (MFD): Attenuation Coefficient (dB/km):	@1310nm 9.2±0.4 µm
Mode Field Diameter (MFD): Attenuation Coefficient (dB/km):	@1550nm 10.4±0.8 µm	@1550nm 9.3±0.8 µm
Core Material: Cladding Diameter:	@1310nm <0.7dB/km	@1310nm <0.8dB/km
Core Material: Cladding Diameter:	@1550nm <0.7dB/km	@1550nm <0.8dB/km
Delivery Length:	Doped Germanium Quartz	High-Purity Quartz
Coating Diameter:	125±1 µm
Core-Cladding Concentricity:	≤30 km
Cladding Non-Circularity (%):	155±5 µm
Coating Material:	≤0.6 µm
Long-Term Operating Temperature:	≤0.1
Short-Term Tolerable Temperature:	Polyimide
Selection Strength:	-65~300 ℃
Numerical Aperture (NA):	400 ℃
Mode Field Diameter (MFD):	100 kpsi

** - measured at 20pm resolution within 1nm of the spectral maximum

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