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)