AcoustiSens Single-Mode Optical Fiber, part of the LineaSens family, is an enabling component engineered to enhance and improve Distributed Acoustic Sensing (DAS) cables. With an optical waveguide based on the ITU-T G.652.D telecom-grade single-mode standard, AcoustiSens fibers are engineered to significantly improve Optical Signal to Noise Ratio (OSNR) by increasing Rayleigh backscatter while maintaining low attenuation. This groundbreaking technology, when coupled via sensing cables to commercially available DAS systems, enables dramatic improvements in Acoustic Signal to Noise Ratio (ASNR). Furthermore, AcoustiSens fibers are splice compatible with G.652.D optical fibers, assuring smooth integration with commonly deployed sensing solutions.

Product Description
Next generation Distributed Acoustic Sensing (DAS) solutions rely on greatly improved ASNR. AcoustiSens optical fiber technology is engineered to boost sensing signals (Rayleigh backscatter) while minimizing the noise (attenuation) associated with standard and specially doped single-mode alternatives. The result is OSNR orders of magnitude better than other solutions. Engineered to give OSNR improvements without sacrificing fiber splice or connector attenuation, OFS AcoustiSens is a drop-in fiber replacement that provides improved sensing performance without the need for changes in interrogation equipment or complex optical amplification schemes. This translates into significantly improved acoustic sensing performance in DAS systems.

End-Use Examples
OFS AcoustiSens optical fibers are intended for use as components in optical and hybrid cables designed for vibration or acoustic sensing applications such as:

• Pipeline monitoring (midstream)
• In-well monitoring (upstream - low temperature wells)
• Rail monitoring
• Perimeter monitoring
• Subsea monitoring
• Highway monitoring
• Smart City applications

As critical components within acoustic and vibration sensing cables for DAS, AcoustiSens fibers improve sensitivity by increasing Rayleigh backscatter while adding little attenuation, effectively boosting the ASNR of the sensing system.

With these advances, cables enabled by AcoustiSens provide:

Features

Benefits

Increased Rayleigh backscatter in 1530 to 1565 nm window

Fiber has greater sensitivity to environmental vibration (acoustics)

Little added attenuation over commercially available G.652.D optical fibers

Increased sensitivity with little added noise dramatically improves Signal to Noise Ratio (SNR) enabling improvements Distributed Acoustic Sensing (DAS) Systems

Simplified coupling

Splice-compatible with telecom grade G.652.D optical fibers

Dramatically improved OSNR for detection of vibration/ acoustics

Enables design of sensing cables for increased offset from assets being monitored: oil and gas pipelines, railroads, perimeters

Detection of weaker acoustic/vibration events as compared to standard G.652.D fibers

Improves effectiveness of DAS systems allowing extension of traditional sensing range



Unit of Measure

Specifications

Type

N/A Single-Mode

Short-Term Bend Radius

N/A 10 mm

Long-Term Bend Radius

N/A 17 mm

Enhancement

N/A 10-15 dB

Base Fiber Type

N/A G.652.D

Attenuation @ 1310 nm

N/A < 0.7 dB/km

Attenuation @ 1550 nm (nominal)

N/A < 0.7 dB/km

Glass Outer Diameter

N/A 125 µm

Nominal Interrogator Wavelength Band (nm)

N/A 1540 ± 6

Optical Properties

Operating Wavelength

N/A 1540 nm

Mode Field Diameter

N/A 10.4 µm

Dimensions/Geometric Properties

Coating/Buffer Diameter

N/A 200 ± 10 µm

Coating/Buffer Descriptions

Coating Material

N/A Proprietary

Operating Temperature

N/A -40 to +85 ºC

Mechanical and Testing Data

Proof Test Level

N/A ≥ 100 kpsi