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GeoSil®-SM fibers, made with a pure silica core and high 0.17 NA, offer extreme resistance to hydrogen plus low bend loss. The chemically resistant PYROCOAT® polyimide coating allows performance to 300 degrees C for mechanical reliability in the down-hole environment.
Unit of Measure



N/A Single-Mode

Short-Term Bend Radius

N/A ≥ 10 mm

Long-Term Bend Radius

N/A ≥ 15 mm

Optical Properties

Operating Wavelength

N/A 1550 nm

Cutoff Wavelength

N/A 1440 nm ± 60 µm

Mode Field Diameter

N/A @ 1550 nm, 7.8 ± 0.5 µm


N/A @ 1550 nm, ≤ 1 dB/km

Numerical Aperture (Nominal)

N/A 0.17

Bend Loss @ 1550 nm

N/A @ 1550 nm, ≤ 0.10 dB

Dimensions/Geometric Properties

Clad Diameter

N/A 125 ± 2 µm

Coating/Buffer Diameter

N/A 155 ± 5 µm

Clad Non-Circularity

N/A ≤ 2.0%

Core/Clad Offset

N/A ≤ 1.0 µm

Coating Diameter

N/A 155 ± 5 µm

Coating Concentricity

N/A ≥ 80%

Coating/Buffer Descriptions

Coating Material


Operating Temperature

N/A -65 to +300 ºC

Mechanical and Testing Data

Proof Test Level

N/A ≥ 100 kpsi0.689 GPa

How To Order:

Order From Location

1.888.438.9936 toll-free in the United States and Canada
1.860.678.0371 from outside the U.S.A.
55 Darling Drive
Avon, CT 06001, USA

Order By Item #

N/A F21976


N/A OFS polyimide optical fibers are known to operate in environments up to 300 °C. Performance is application dependent. Contact our Technical Sales department to discuss your specific application requirements. 1-860-678-6636

Typical Applications

N/A Datacom in Harsh Environments Distributed Temperature Sensing High-Temperature DTS Local Area Networks with Elevated Temperature Requirements


N/A Additional Coatings Cabling Connectorization Metalization Other Upgrades