62.5/125 µm Multi-mode Graded-Index PYROCOAT® Optical Fibre
- Technology
- Speciality fibre
- Partner
- Lightera (formerly OFS)
The F91908 PYROCOAT graded-index multimode optical fibre is a 62.5/125 µm fibre engineered for use in demanding conditions. It combines a large 62.5 µm core with a graded-index profile to support high-bandwidth data transmission, especially around the 1300 nm wavelength commonly used in industrial systems. The fibre’s proprietary PYROCOAT polyimide coating allows it to withstand temperatures up to 300 °C, making it well-suited to harsh environments and extreme temperature applications where standard fibres would fail. With a high numerical aperture of 0.275, this fibre can maintain reliable optical performance even when bent around tight corners or small coil diameters. It works with both LED and laser light sources, offering flexibility for integration into legacy LED-based sensor networks or modern laser-driven communication links. Typical application areas include distributed temperature sensing (DTS), fibre-optic links in high-temperature industrial settings, and selected medical instruments where robust, heat-resistant fibres are required.
The F91908 is a 62.5/125 µm graded-index multimode optical fibre designed for environments where conventional coated fibres are not suitable. Its PYROCOAT® polyimide coating supports reliable use across a wide temperature range up to 300 °C, while the 0.275 numerical aperture helps maintain efficient light capture and transmission. The fibre is suitable for industrial data links, distributed temperature sensing, and other harsh-environment optical applications requiring multimode performance and high thermal resistance.
Range features
A high level overview of what this range offers
- High-temperature PYROCOAT® coating: Supports continuous operation up to 300 °C for demanding heat-intensive environments
- Standard 62.5/125 µm geometry: Compatible with common multimode connector systems and existing 62.5 µm OM1-style infrastructure
- High numerical aperture (0.275): Enables efficient light coupling and stable performance, including tighter routing conditions
- 1300 nm optimised bandwidth: Provides ≥ 300 MHz·km at 1300 nm for higher-capacity multimode links
- LED and laser source compatibility: Suitable for both legacy LED-based systems and modern laser-driven installations
- Strong mechanical reliability: Proof-tested to 100 kpsi (0.689 GPa) for durability during installation and operation
- Flexible supply options: Available with cabling, connectorisation, or metallisation on request
Downloads
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62.5/125 µm PYROCOAT Optical Fibre – Datasheet
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Specification | Value |
Product Description | 62.5 µm PYROCOAT graded-index multimode optical fibre (part no. F91908) |
Coating Material | PYROCOAT® polyimide |
Core Diameter | 62.5 ± 3 µm |
Cladding Diameter | 125 ± 1 µm |
Coating Diameter | 155 ± 5 µm |
Core/Cladding Offset | ≤ 3 µm |
Core Non-Circularity | ≤ 5 % |
Cladding Non-Circularity | ≤ 2 % |
Fibre Type | Multimode (graded-index) |
Numerical Aperture (NA) | 0.275 |
Bandwidth @ 850 nm | ≥ 160 MHz·km |
Bandwidth @ 1300 nm | ≥ 300 MHz·km |
Attenuation @ 850 nm | ≤ 3.5 dB/km |
Attenuation @ 1300 nm | ≤ 1.5 dB/km |
Operating Temperature | –65 °C to +300 °C |
Minimum Bend Radius (short-term) | ≥ 10 mm |
Minimum Bend Radius (long-term) | ≥ 17 mm |
Proof Test Level | 100 kpsi (0.689 GPa) |
Part Number | F91908 |
Product Code | TCU-MD062H2 |
Available Options | Cabling, connectorisation, metallisation |
FAQs
for 62.5/125 µm Multi-mode Graded-Index PYROCOAT® Optical Fibre
It is specified for reliable operation from –65 °C to +300 °C. The PYROCOAT® polyimide coating is engineered for prolonged use in high-temperature environments where standard coated fibres would typically fail.
This graded-index multimode fibre provides a minimum bandwidth of 160 MHz·km at 850 nm and 300 MHz·km at 1300 nm. This makes it suitable for multimode links requiring stronger performance at 1300 nm.
Yes. The fibre is designed for use with both LED and laser light sources. Its 0.275 numerical aperture supports efficient light capture from broader LED output as well as laser-based systems.
The minimum bend radius is 10 mm short-term and 17 mm long-term. The short-term value applies during handling or installation, while the long-term value is recommended for permanent deployment to reduce stress and minimise attenuation over time.
Yes. In addition to the standard bare-fibre format with polyimide coating, the product is available with cabling, connectorisation, or metallisation on request for easier integration into different installation environments.
Typical applications include distributed temperature sensing (DTS), industrial optical links in harsh environments, and selected medical devices or imaging systems that require multimode optical performance combined with high heat resistance.
Compared with standard acrylic fibre coatings, PYROCOAT® polyimide is designed for far higher temperature resistance and improved durability in demanding conditions. It extends the usable operating range of the fibre and helps maintain performance in environments that would quickly degrade conventional coatings.
