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High power 1550 nm amplifiers based on double clad Er/Yb fibers are widely used in CATV and Telecom applications.

The 1550 nm passive double clad fiber is ideal for use both as a pump and signal output fiber in combiners and as a laser

delivery fiber. The high cut-off, bend insensitive design of this fiber ensures excellent signal confinement, while allowing for

low splice loss to Er/Yb doped double clad fibers and industry standard SMF-28™ fiber. They are available in both non-PM

design for traditional high power amplifiers and in PANDA-style PM design for high power coherent communications and

frequency conversion applications.

Typical Applications

• CATV and Telecom amplifiers

• Laser delivery/fluorescence

Features & Benefits

• NuCOAT™ fluorocrylate coating – Greater fiber durability in extreme environmental operating & storage conditions

• Exceptional uniformity and core/clad concentricity — Low connectorization losses

• Bend insensitive — Survives application in tight confines

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

Optical Specifications

PM-GDF-1550

SM-GDF-1550

Operating Wavelength

1450 – 1600 nm

1450 – 1600 nm

Core NA

0.120

0.120

First Cladding NA (5%)

≥ 0.46

≥ 0.460

Mode Field Diameter

10.5 ± 0.7 µm @ 1550 nm

10.5 ± 0.7 µm @ 1550 nm

Cutoff

1440 ± 80 nm

1440 ± 80 nm

Core Attenuation

≤ 2.0 dB/km @ 1550 nm

≤ 1.00 dB/km @ 1550 nm

Cladding Attenuation

≤ 15.0 dB/km @ 1095 nm

≤ 15.0 dB/km @ 1095 nm

Birefringence

2.5 × 10⁻⁴

N/A

Geometrical & Mechanical

Specifications

Cladding Diameter

130.0 ± 1.0 µm

125.0 ± 1.0 µm

Core Diameter

9 µm

9 µm

Coating Diameter

245.0 ± 10.0 µm

245.0 ± 10.0 µm

Coating Concentricity

< 5.0 µm

< 5.0 µm

Core/Clad Offset

≤ 0.50 µm

≤ 0.50 µm

Prooftest Level

≥ 100 kpsi (0.7 GN/m²)

≥ 100 kpsi (0.7 GN/m²)