NuSENSOR 1550 nm Bend
Insensitive Single-Mode Fibers
Coherent's NuSENSOR bend-insensitive single-mode fibers are highly engineered to be micro and macro bend resistant for
Raman, Brillouin and FBG based temperature and strain measurements at 1550 nm. These 0.12 NA, bend-insensitive single
mode fibers provide tight tolerance optical and geometrical specifications measured at the application critical wavelengths.
The fiber comes with either a polyimide or mid-temperature acrylate coating and are also available with a hermetic carbon
layer. The hermetically carbon-coated layer is immune to the damaging effects of hydrogen ingression, enabling distributed
temperature and strain sensing in harsh environments where high H₂ partial pressure and elevated temperatures up to
300°C are present.
Typical Applications
• Enhanced oil recovery processes
• Hydrothermal well temperature
measurements
• Oil reservoir optimization
• Brillouin distributed temperature &
strain sensing
Features & Benefits
• Bend-Insensitive core design — Minimizing micro and macro bend loss
• Exceptional uniformity — Consistent and repeatable performance
• Long unattended deployments or short cycle in-out applications
• Low loss over the wavelengths range critical to DTSS & FBG sensors
• Available with hermetic carbon coating — Enabling resistance to H₂ ingression, low cost and long life deployment
Optical Specifications
R1550XB-P
R1550XB-CP
R1550XB-MTA
R1550XB-CMTA
Operating Wavelength
1500 – 1700 nm
1500 – 1700 nm
1500 – 1700 nm
1500 – 1700 nm
Core NA
0.120
0.120
0.120
0.120
Mode Field Diameter
10.4 ± 0.4 µm @ 1550 nm
10.4 ± 0.4 µm @ 1550 nm
10.4 ± 0.4 µm @ 1550 nm
10.4 ± 0.4 µm @ 1550 nm
Cable Cutoff
N/A
1430 ± 50 nm
1430.0 ± 50.0 nm
1430 ± 50 nm
Core Attenuation
≤ 0.60 dB/km @ 1550 nm
≤ 0.60 dB/km @ 1550 nm
≤ 0.24 dB/km @ 1550 nm
≤ 0.25 dB/km @ 1550 nm
Geometrical & Mechanical
Specifications
Cladding Diameter
125.0 ± 1.0 µm
125.0 ± 1.0 µm
125.0 ± 1.0 µm
125.0 ± 1.0 µm
Core Diameter
9.0 µm
9.0 µm
9.0 µm
9.0 µm
Coating Diameter
150.0 ± 5.0 µm
150.0 ± 5.0 µm
245.0 ± 5.0 µm
245.0 ± 5.0 µm
Coating Concentricity
< 1.5 µm
< 1.5 µm
< 5.0 µm
< 5.0 µm
Core/Clad Offset
≤ 0.50 µm
≤ 0.50 µm
≤ 0.50 µm
≤ 0.50 µm
Coating Material
Polyimide
Polyimide
Mid Temperature Acrylate
Mid Temperature Acrylate
Operating Temperature Range
-65 to 300 °C
-65 to 300 °C
-40 to 150 °C
-40 to 150 °C
Short Term Bend Radius
≥ 12 mm
≥ 12 mm
≥ 12 mm
≥ 12 mm
Long Term Bend Radius
≥ 25 mm
≥ 25 mm
≥ 25 mm
≥ 25 mm
Prooftest Level
≥ 100 kpsi (0.7 GN/m²)
≥ 100 kpsi (0.7 GN/m²)
≥ 100 kpsi (0.7 GN/m²)
≥ 100 kpsi (0.7 GN/m²)
