© 2014, AFL, all rights reserved. PP-6-00018, Revision 2, 4.28.2020 Specifications are subject to change without notice. AFLglobal.com | 800.235.3423 24 Specialty Optical Fiber Features • Optimized for 1550 nm Single Wavelength Operation • Round core • Elliptical Clad designs provide high birefringence allowing the fiber to have an extremely short beat-length, excellent for high-precision gyroscopes • Radiation-Resistant “Rad-Hard” • Available in 80 μm clad diameter Applications • Fiber optic gyroscopes • Fiber lasers • Current sensors VPM400 Series Fibers Verrillon ® VPM400 Series is a family of Polarization-Maintaining (PM) Optical Fibers based on the Elliptical-Clad stress technology. These fibers exhibit extremely high birefringence resulting in beat lengths shorter than 2 mm at 1550 nm. VPM400 fibers show significantly lower attenuation at 1550 nm than other PM fiber designs. These fibers are available in various designs and operating wavelengths, as well cladding dimensions including 50, 80 and 125 microns. Specifications PART NO. PMF-9-A-80-1 PMF-12-A-80-1 Description 80 μm Elliptical Clad Polarization maintaining Single-mode Fiber, 1550 nm Operational Wavelength 80 μm Elliptical Clad Polarization maintaining Single-mode Fiber, 1550 nm Operational Wavelength PARAMETER VALUE Material Coating Dual UV Acrylate Acrylate Stress-inducing Design Elliptical Clad Elliptical Clad Geometry Clad Diameter (μm) 80 ± 2 80 ± 2 Core/Clad Concentricity (μm) ≤ 1.0 ≤ 1.0 Coating Diameter (μm) 165 ± 10 160 ± 10 Optical NA (nominal) 0.20 0.20 Attenuation (dB/km) @ 1550 nm ≤ 0.5 ≤ 1.5 Mode Field Diameter 1 (μm) @ 1550 nm 7.0 ± 1.0 6.5 ± 0.5 Operational Wavelength (nm) 1550 1550 Cutoff Wavelength (nm) ≤ 1480 < 1520 Beat Length (mm) @ 1550 nm ≤ 2.00 ≤ 2.2 Bend Loss 2 (dB/turn) @ 1550 nm ≤ 0.05 — H-Parameter — ≤ 5.0 x 10 -5 Mechanical Proof Test (kpsi) ≥ 100 ≥ 100 Operating Temperature (°C) -10 to +70 -60 to +80 1 Gaussian Definition 2 12 mm diameter mandrel