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10/125 Precision Matched

Passive LMA Fibers

Nufern’s large mode area (LMA) passive single and double clad fibers are ideally suited for applications spanning military,

industrial and medical including linearly polarized fiber lasers and amplifiers. These fibers feature a 10 micron diameter

core and 125 micron diameter clad size with a low NA (0.075) core. They are precision matched to their LMA Yb-doped

10/125 matched counterparts to ensure excellent splice compatibility and low loss. As with all Nufern standard LMA fibers,

these fibers are proof-tested to 100 kpsi, an industry requirement for long term reliability. They utilize the latest fiber design

and the double clad fibers features NuCOAT-FA coating technology to ensure excellent preservation of beam quality and

extended operating life demanded by today’s industrial fiber laser applications.

Typical Applications

• Pulsed fiber lasers and amplifiers

• Material processing

• LIDAR

• Non-linear optics/frequency

doubling

Features & Benefits

• NuCOAT-FA fluoroacrylate coating — Greater fiber durability in extreme environmental operating & storage

conditions

• Bend insensitive — Survives application in tight confines

• Optimized LMA core design — Easy to maintain single mode LP01 beam through fiber & components at high power

• Precision Matched (M) — Providing low splice loss

• All fiber proof tested to > 100 kpsi — Critical for ensuring long term reliability

Optical Specifications

LMA-GSF-10/125-M

LMA-GDF-10/125-M

Operating Wavelength

1015 – 1115 nm

1015 – 1115 nm

Core NA

0.075 ± 0.005

0.075 ± 0.005

First Cladding NA (5%)

N/A

≥ 0.46

Core Attenuation

≤ 40.0 dB/km @ 1300 nm

≤ 20.0 dB/km @ 1200 nm

≤ 40.0 dB/km @ 1300 nm

≤ 20.0 dB/km @ 1200 nm

Geometrical & Mechanical

Specifications

Cladding Diameter

125.0 ± 1.0 µm

125.0 ± 1.0 µm

Core Diameter

11.0 ± 1.0 µm

11.0 ± 1.0 µm

Coating Diameter

245.0 ± 10.0 µm

245.0 ± 10.0 µm

Coating Concentricity

< 5.0 µm

< 5.0 µm

Core/Clad Offset

≤ 0.70 µm

≤ 0.70 µm

Clad Non-Circularity

≤ 0.5 %

≤ 0.5 %

Coating Material

Dual Acrylate Coating

Low Index Polymer

NuCOAT-FA

Prooftest Level

≥ 100 kpsi (0.7 GN/m²)

≥ 100 kpsi (0.7 GN/m²)