Smart Product Number: LMA-YDF-20/400-9M
20/400 NuGEN9 Precision Matched Active LMA Double Clad Fiber

NuGEN9 active fibers offer the most advanced glass composition and fiber design and are all precision matched to their passive counterpart ensuring excellent splice compatability and low loss. This fiber is a Yb-doped Large Mode Area (LMA) active double clad fiber featuring a 20 micron diameter core and 400 micron clad diameter with a low NA (0.065) core. This fiber is ideal for high power fiber lasers and amplifiers used in military, industrial, and medical applications. NuGEN9 fibers feature an optimized glass composition enabling higher absorption with superior photodarkening performance. These fibers are proof-tested to 100 kpsi, an industry requirement for long term reliability. NuGEN9 fibers are exclusively offered with Nufern's proprietary NuCOATFA coating technology with the best wet and dry heat performance available, ensuring excellent preservation of beam quality and extended operating life.
Optical Specifications
- Operating Wavelength
- 1015 – 1115 nm
- Core NA
- 0.065 ± 0.005
- First Cladding NA(5%)
- ≥ 0.46
- Core Attenuation
- ≤ 30.0 dB/km @ 1300 nm
≤ 15.0 dB/km @ 1200 nm - Cladding Attenuation
- ≤ 15.0 dB/km @ 1095 nm
- Cladding Absorption
- 0.48 ± 0.06 dB/m at 915 nm
- Slope Efficiency
- > 70.0% @ 915 nm
Geometrical & Mechanical Specifications
- Cladding Diameter(flat-to-flat)
- 400.0 ± 10.0 µm
- Core Diameter
- 20.0 ± 1.5 µm
- Coating Diameter
- 550.0 ± 15.0 µm
- Core/Clad Offset
- ≤ 2.00 μm
- Prooftest Level
- ≥ 100 kpsi (0.7 GN/m²)
Comments
Coating Requirements: Low Index Polymer NuCOAT-FA.
The ultra matched passive fiber is also available - see LMA-GDF-20/400-M+
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Features & Benefits
- NuGEN9 fiber design — Providing higher absorption with superior reliability & photodarkening performance
- NuCOATFA fluoroacrylate coating — Excellent wet and dry heat performance for extended life in extreme conditions
- “Few” moded core design — Easy to maintain single mode LP01 beam through fiber & components
- All fiber proof tested to > 100 kpsi — Critical for ensuring long term reliability
Typical Applications
- Monolithic high power lasers & amplifiers
- LMA fiber couplers, pump combiners & FBG
- High power pump & signal pigtails
- Military, industrial and medical
Nufern’s optical fiber products, including rare-earth doped, gyro, polarization-maintaining, radiation resistant, photosensitive, multimode and single mode, and any other optical fiber product including custom optical fibers, may be covered by one or more of the following pending or issued U.S. Patents, each of which is owned by or licensed by Nufern:
6,779,364; 6,832,026; 6,904,214; 6,950,586; 7,003,206; 7,050,686; 7,062,137; 7,110,647; 7,116,887; 7,167,621; 7,317,857; 7,371,019; 7,386,210; 7,400,812; 7,483,610; 7,634,164; 7,724,422; 5,949,941 (licensed from Furukawa Electric Co. of North America).
Moreover, use of Nufern’s optical fiber products, including modifications thereof, combinations with other products, or certain specific uses can necessitate additional customer licensing, particularly with respect to U.S. Patent nos. 5,818,630 (IMRA America, Inc.) and 6,496,301 (The United States of America as represented by the Secretary of the Navy). See the terms and conditions specific to your purchase.

Related Fibers
Technical Information
Brochures NuCOAT Flyer [PDF] NuMATCH Flyer [PDF] NuYDF Flyer [PDF] Fiber Data Matched Fibers Corresponding Active/Passive Fibers [PDF] |
Optical Specifications
- Operating Wavelength
- 1015 – 1115 nm
- Core NA
- 0.065 ± 0.005
- First Cladding NA(5%)
- ≥ 0.46
- Core Attenuation
- ≤ 30.0 dB/km @ 1300 nm
≤ 15.0 dB/km @ 1200 nm - Cladding Attenuation
- ≤ 15.0 dB/km @ 1095 nm
- Cladding Absorption
- 0.48 ± 0.06 dB/m at 915 nm
- Slope Efficiency
- > 70.0% @ 915 nm
Geometrical & Mechanical Specifications
- Cladding Diameter(flat-to-flat)
- 400.0 ± 10.0 µm
- Core Diameter
- 20.0 ± 1.5 µm
- Coating Diameter
- 550.0 ± 15.0 µm
- Core/Clad Offset
- ≤ 2.00 μm
- Prooftest Level
- ≥ 100 kpsi (0.7 GN/m²)
Comments
Coating Requirements: Low Index Polymer NuCOAT-FA.
The ultra matched passive fiber is also available - see LMA-GDF-20/400-M+
[ EXPAND ALL ]
Features & Benefits
- NuGEN9 fiber design — Providing higher absorption with superior reliability & photodarkening performance
- NuCOATFA fluoroacrylate coating — Excellent wet and dry heat performance for extended life in extreme conditions
- “Few” moded core design — Easy to maintain single mode LP01 beam through fiber & components
- All fiber proof tested to > 100 kpsi — Critical for ensuring long term reliability
Typical Applications
- Monolithic high power lasers & amplifiers
- LMA fiber couplers, pump combiners & FBG
- High power pump & signal pigtails
- Military, industrial and medical
Nufern’s optical fiber products, including rare-earth doped, gyro, polarization-maintaining, radiation resistant, photosensitive, multimode and single mode, and any other optical fiber product including custom optical fibers, may be covered by one or more of the following pending or issued U.S. Patents, each of which is owned by or licensed by Nufern:
6,779,364; 6,832,026; 6,904,214; 6,950,586; 7,003,206; 7,050,686; 7,062,137; 7,110,647; 7,116,887; 7,167,621; 7,317,857; 7,371,019; 7,386,210; 7,400,812; 7,483,610; 7,634,164; 7,724,422; 5,949,941 (licensed from Furukawa Electric Co. of North America).
Moreover, use of Nufern’s optical fiber products, including modifications thereof, combinations with other products, or certain specific uses can necessitate additional customer licensing, particularly with respect to U.S. Patent nos. 5,818,630 (IMRA America, Inc.) and 6,496,301 (The United States of America as represented by the Secretary of the Navy). See the terms and conditions specific to your purchase.

Related Fibers
Technical Information
Brochures NuCOAT Flyer [PDF] NuMATCH Flyer [PDF] NuYDF Flyer [PDF] Fiber Data Matched Fibers Corresponding Active/Passive Fibers [PDF] |