Ultra-Weak FBG Sensor Arrays

Controlled ultra-low-reflectivity grating arrays for high-density strain, temperature and vibration measurements along a single optical fiber.

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Products › 📌 UW-FBG Products

Product Models

Select the fiber construction, coating and grating geometry that match the required measurand and operating environment.

RS-UWFBG-S1

ɸ 250 μm · Acrylate Coating

Standard weak grating array using automated tower inscription process. Excellent for distributed strain sensing and structural deformation monitoring with up to 10,000 με strain range.

Fiber Diameter245 μm ±5 μm
Operating Temp-20°C ~ 90°C
Reflectivity0.01% ~ 0.1%
Strain Range> 10,000 με
Temp Sensitivity10.02 pm/°C
Strain Sensitivity1.2 pm/με

Applications: Distributed strain sensing, structural deformation monitoring, high-precision chain temperature sensing

RS-UWFBG-S2

ɸ 165 μm / 900 μm · Ormocer Coating

High-temperature resistant weak grating array using femtosecond laser inscription. Exceptional temperature range of -200°C to +300°C for extreme environments.

Fiber Diameter195 μm (900 μm optional)
Operating Temp-200°C ~ +300°C
Reflectivity0.01%
CoatingOrmocer
Temp Sensitivity10.8 pm/°C
Strain Sensitivity1.21 pm/με

Applications: Extreme high/low temperature measurement, large-scale distributed strain sensing

RS-UWFBG-S3

ɸ 165 μm · Special Polyimide Coating

Humidity-sensitive weak grating array with special polyimide coating. High sensitivity 4.6 pm/%RH for large-scale, multi-point humidity testing in bridge cables and special environments.

Center Wavelength1528~1568 nm
Humidity Sensitivity4.6 pm/%RH @ 30°C
Fiber Diameter165 μm ±5 μm
Operating Temp-20°C ~ 60°C

Applications: Bridge cable internal humidity measurement, special environment humidity testing

RS-UWFBG-S4

ɸ 900 μm · Acrylate/Hytrel

Tight-buffer design with strain range > 20,000 με. Can be directly bonded to structure surfaces or processed into various sensing cables.

Center Wavelength1528~1568 nm
Fiber Diameter900 μm
Strain Range> 20,000 με
Operating Temp-20°C ~ 90°C

Applications: Concrete structure surface strain, metal structure monitoring, tunnel wall displacement

RS-UWFBG-S5

ɸ 2.0 mm · TPU Coating

TPU coating with large strain range > 20,000 με. Suitable for structural surface pre-tension installation or groove embedding.

Center Wavelength1528~1568 nm
Fiber Diameter2.0 mm (TPU)
Strain Range> 20,000 με
Operating Temp-20°C ~ 90°C

Applications: Structural surface strain, crack monitoring, distributed strain cable manufacturing

RS-UWFBG-D1

ɸ 250 μm · Bandwidth ≥ 4.9 nm @3dB

Distributed Acoustic Sensing (DAS) weak grating array. Significantly improves DAS signal-to-noise ratio compared to standard fiber, enabling long-range acoustic event detection.

Center Wavelength1550.12 nm
Bandwidth@3dB≥ 4.9 nm (G.652D)
Fiber CoatingAcrylate / Modified Acrylate
Operating Temp-40°C ~ 120°C
Typical Spacing2m, 5m (1m~50m)

Applications: DAS sensing systems, oil well logging, pipeline leak detection, perimeter security

RS-UWFBG-D2

ɸ 165 μm · G.657A2 Fiber

Fine-diameter DAS weak grating array with high acoustic sensitivity and excellent bending performance. Reduces cable processing and construction loss.

Center Wavelength1550.12 nm
Bandwidth@3dB≥ 5 nm
Fiber CoatingAcrylate / Modified Acrylate
Fiber TypeG.657A2
Typical Spacing2m, 5m (1m~50m)

Applications: Distributed DAS sensing, underwater acoustic monitoring, VSP vibration sensors

RS-UWFBG-R1

GFRP · 1.0 mm / 2.0 mm

Glass Fiber Reinforced Polymer smart reinforcement. Available in 1.0mm and 2.0mm diameters with high mechanical strength for structural surface bonding.

Cable Diameter1.0 mm / 2.0 mm
Operating Temp-20°C ~ 120°C
Tensile Strength≥ 500 N (1.0mm)
Temp Sensitivity17.86 pm/°C
Strain Sensitivity1.18 pm/με

Applications: Structure surface strain monitoring, deformation sensing experiments

RS-UWFBG-R2

CFRP · 5.0 mm / 7.0 mm

Carbon Fiber Reinforced Polymer smart reinforcement bar. Excellent mechanical strength ≥2100 MPa and thermal stability for bridge cables and anchor monitoring.

Center Wavelength1528~1568 nm
Cable Diameter5.0 mm / 7.0 mm
Tensile Strength≥ 2100 MPa
Elastic Modulus≥ 110 GPa

Applications: Bridge cable monitoring, anchor monitoring, structural reinforcement

RS-UWFBG-R3

CFRP Strip · 30 mm × 1.2 mm

Carbon Fiber Reinforced Polymer strip sensor. Excellent for bridge reinforcement and structural health monitoring with long service life and high tensile strength.

Center Wavelength1528~1568 nm
Strip Size30 mm × 1.2 mm
Tensile Strength≥ 2100 MPa
Elastic Modulus≥ 110 GPa

Applications: Bridge reinforcement, anchor bolts, structural monitoring

Technical Specifications

Complete specifications for all UW-FBG sensor models

Download Datasheets (PDF)

Parameter	Specification
Center Wavelength	1528 nm ~ 1568 nm
Wavelength Accuracy	±0.5 nm
Reflectivity	0.01%~0.1%
Grating Length	10 mm
Bandwidth@-3dB	≤0.30 nm
Side Mode Suppression Ratio	≥15 dB
Fiber Attenuation	≤0.30 dB/km
Typical Grating Spacing	0.2m, 0.5m, 1m, 2m, 5m
Fiber Coating	Acrylate / Polyimide
Fiber Diameter	245 μm ±5 μm
Break Tensile Load	≥20 N
Operating Temperature	-20°C ~ 90°C
Temperature Sensitivity	10.02 pm/°C
Strain Sensitivity	1.2 pm/με

Parameter	Specification
Center Wavelength	1528 nm ~ 1568 nm
Wavelength Accuracy	±0.5 nm
Grating Length	4 mm
Reflectivity	0.01%
Bandwidth@-3dB	≤0.30 nm
Fiber Coating	Ormocer
Fiber Diameter	195 μm (900 μm optional)
Break Tensile Load	≥30 N
Operating Temperature	-200°C ~ +300°C
Temperature Sensitivity	10.8 pm/°C
Strain Sensitivity	1.21 pm/με

Parameter	Specification
Center Wavelength	1528 nm ~ 1568 nm
Wavelength Accuracy	±0.5 nm
Grating Length	10 mm
Reflectivity	0.01% ~ 0.1%
Bandwidth@-3dB	≤0.30 nm
Side Mode Suppression Ratio	≥15 dB
Fiber Attenuation	≤0.5 dB
Typical Grating Spacing	0.2m, 0.5m, 1m, 2m, 5m
Fiber Coating	Special Polyimide
Fiber Diameter	165 μm ±5 μm
Break Tensile Load	≥10 N
Operating Temperature	-20°C ~ 60°C
Temperature Sensitivity	12.10 pm/°C @ 55% RH
Humidity Sensitivity	4.6 pm/%RH @ 30°C

Parameter	Specification
Center Wavelength	1528 nm ~ 1568 nm
Wavelength Accuracy	±0.5 nm
Grating Length	10 mm
Reflectivity	0.01% ~ 0.1%
Bandwidth@-3dB	≤0.30 nm
Side Mode Suppression Ratio	≥15 dB
Fiber Attenuation	≤0.30 dB/km
Typical Grating Spacing	0.2m, 0.5m, 1m, 2m, 5m
Fiber Coating	Acrylate / Hytrel
Fiber Diameter	900 μm
Break Tensile Load	≥50 N
Operating Temperature	-20°C ~ 90°C
Strain Sensitivity	1.2 pm/με
Strain Range	> 20,000 με

Parameter	Specification
Center Wavelength	1528 nm ~ 1568 nm
Wavelength Accuracy	±0.5 nm
Grating Length	10 mm
Reflectivity	0.01% ~ 0.1%
Bandwidth@-3dB	≤0.30 nm
Side Mode Suppression Ratio	≥15 dB
Fiber Attenuation	≤0.30 dB/km
Typical Grating Spacing	0.2m, 0.5m, 1m, 2m, 5m
Fiber Coating	Acrylate / Hytrel / TPU
Fiber Diameter	2.0 mm
Break Tensile Load	≥50 N
Operating Temperature	-20°C ~ 90°C
Strain Sensitivity	1.2 pm/με
Strain Range	> 20,000 με

Parameter	Specification
Center Wavelength	1550.12 nm
Grating Length	10 mm
Reflectivity	0.01% ~ 0.05%
Bandwidth@-3dB	≥4.9 nm (G.652D) / ≥22 nm (G.657A2)
Side Mode Suppression Ratio	≥15 dB
Fiber Attenuation	≤0.30 dB/km
Fiber Coating	Acrylate / Modified Acrylate
Fiber Diameter	250 μm ±5 μm
Break Tensile Load	≥30 N (3% strain)
Operating Temperature	-40°C ~ 120°C
Typical Grating Spacing	2m, 5m (1m~50m customizable)
Temperature Sensitivity	10.02 pm/°C

Parameter	Specification
Center Wavelength	1550.12 nm
Grating Length	10 mm
Reflectivity	0.01%
Bandwidth@-3dB	≥5 nm
Side Mode Suppression Ratio	≥15 dB
Fiber Attenuation	≤0.30 dB/km
Fiber Coating	Acrylate / Modified Acrylate
Fiber Type	G.657A2
Fiber Diameter	165 μm ±5 μm
Break Tensile Load	≥20 N (2% strain)
Operating Temperature	-20°C ~ 150°C
Typical Grating Spacing	2m, 5m (1m~50m customizable)
Temperature Sensitivity	10.02 pm/°C

Parameter	Specification
Center Wavelength	1528 nm ~ 1568 nm
Wavelength Accuracy	±0.5 nm
Grating Length	10 mm
Reflectivity	0.01% ~ 0.1%
Bandwidth@-3dB	≤0.50 nm
Side Mode Suppression Ratio	≥15 dB
Fiber Attenuation	≤0.4 dB/km
Typical Grating Spacing	0.2m, 0.5m, 1m, 2m, 5m
Cable Weight	8 kg/km (1.0mm) / 16 kg/km (2.0mm)
Cable Diameter	1.0 mm / 2.0 mm
Tensile Strength	≥500 N (1.0mm) / ≥1000 N (2.0mm)
Operating Temperature	-20°C ~ 120°C
Temperature Sensitivity	17.86 pm/°C
Strain Sensitivity	1.18 pm/με

Parameter	Specification
Center Wavelength	1528 nm ~ 1568 nm
Wavelength Accuracy	±0.5 nm
Grating Length	10 mm
Reflectivity	0.01% ~ 0.1%
Bandwidth@-3dB	≤0.50 nm
Side Mode Suppression Ratio	≥15 dB
Fiber Attenuation	≤0.4 dB/km
Typical Grating Spacing	0.2m, 0.5m, 1m, 2m, 5m
Cable Weight	16 kg/km (5.0mm)
Cable Diameter	5.0 mm / 7.0 mm
Elastic Modulus	≥110 GPa
Elongation at Break	≥1.5%
Tensile Strength	≥2100 MPa
Operating Temperature	-20°C ~ 150°C
Temperature Sensitivity	8.95 pm/°C
Strain Sensitivity	1.21 pm/με

Parameter	Specification
Center Wavelength	1528 nm ~ 1568 nm
Wavelength Accuracy	±0.5 nm
Reflectivity	0.01% ~ 0.1%
Bandwidth@-3dB	≤0.50 nm
Side Mode Suppression Ratio	≥15 dB
Fiber Attenuation	≤0.4 dB/km
Typical Grating Spacing	0.2m, 0.5m, 1m, 2m, 5m
Cable Weight	20 kg/km
Strip Dimensions	30 mm × 1.2 mm
Elastic Modulus	≥110 GPa
Elongation at Break	≥1.5%
Tensile Strength	≥2100 MPa
Operating Temperature	-20°C ~ 150°C
Temperature Sensitivity	8.95 pm/°C
Strain Sensitivity	1.21 pm/με

Before ordering

Define the array as part of the sensing chain.

How to Specify a Custom UW-FBG Sensor Array Length, pitch, reflectivity, packaging and interrogation inputs Custom engineering support From application requirement to tested configuration

Deployment Contexts

The sensing fiber is packaged and installed according to how each structure transfers strain, heat or vibration.

Civil Infrastructure

Bridges, highways, tunnels, and dams — long-term structural health monitoring with distributed strain and temperature sensing.

Energy & Power

Power cables, wind turbines, and oil & gas pipelines — continuous monitoring to prevent failures and optimize operations.

Industrial & Manufacturing

Production equipment, industrial pipelines, and facility monitoring — precision measurement for process optimization and safety.

Railway & Transportation

High-speed rail, metro systems, and rail bridges — distributed acoustic sensing for train tracking and infrastructure safety.

Engineering evidence

From optical response to verified measurement

Product performance is evaluated as a complete sensing chain: optical response, signal acquisition, demodulation and repeatable engineering output.

01Assemble

02Measure

03Validate

Project planning

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Talk to our engineers to design a UW-FBG sensing solution tailored to your application.

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