The high-numerical aperture low-OH content of these UltraSil® Optical Fibers result in a large usage window. Low OH concentration is especially effective for using these fibers in near-IR spectroscopy applications.

For laser delivery, HCS® fiber coating preserves cladding modes through bends and distributes lost power over a greater area—lowering the probability of “hot spots.” PYRO options use PYROCOAT® coating only.

For high-temperature performance, we recommend PYROCOAT® polyimide coating. This coating also strips cladding modes for enhanced performance in sensing and spectroscopy applications.
Unit of Measure

Optical Properties


N/A Multimode Step-Index

Numerical Aperture

N/A 0.29


N/A @ 850 nm, ≤ 12 dB/km

Water Content

N/A Low OH

Dimensions/Geometric Properties

Core Diameter

N/A 272 ± 10 µm

Cladding Diameter

N/A 326 ± 10 µm

Coating Diameter

N/A 356 ± 10 µm

Buffer Diameter

N/A 420 ± 30 µm

Core/Clad Offset

N/A ≤ 10 µm

Crimp & Cleave Compatible

N/A No

Coating/Buffer Descriptions

Coating Material


Buffer Material

N/A ETFE (Blue)

Operating Temperature

N/A -65 to +125 ºC

Mechanical and Testing Data

Short-Term Bend Radius

N/A ≥ 24 mm

Long-Term Bend Radius

N/A ≥ 40 mm

Proof Test Level

N/A ≥ 100 kpsi0.689 GPa

How To Order:

Product Description Code

N/A Uncoded

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 BF05246

Typical Applications

N/A Cascaded Laser Power Delivery FTIR and Raman Spectroscopy High-Power Laser Delivery Medical Applications Near- IR (up to 2100 µm) Laser Power Delivery


N/A Buffer Color Buffer Diameter Buffer Material Cabling Clad Diameter Connectorization Core Diameter Metalization Numerical Aperture Proof Test