Sensing in a new Dimension
Femtosecond-Laser-Written Fiber Bragg Gratings

As the first commercial supplier for femtosecond(fs)-laser-written Fiber Bragg Gratings (FBGs) worldwide, FemtoFiberTec provides FBGs, that open up  completely new sensing possibilities for a wide range of industrial and medical sensing applications.

In contrast to conventional FBG solutions, FemtoFiberTec can write FBGs into all optical transparent fiber materials with a broad variety of fiber coatings – e.g. high-end speciality fibers as well as low-cost commodity fibers. The fs-written FBGs are of superior strength, withstand temperatures of up to 1,000°C and can be immune to radioactivity and humidity.

Thousands of FGBs can be integrated into one single sensor array to allow multipoint measurements along distances of many kilometers. The manufacturing technology provides the highest possible flexibility in terms of customer individual FBG specifications and production volumes - from one up to thousands of units. Furthermore, customer orders are produced within shortest lead times in the industry.

All these unique strength open up unprecedented possibilities for advanced fiber optical sensing solutions. This is sensing in a new dimension.

NEW PRODUCT INTRODUCTION ON SENSOR+TEST 2016

Fiber Bragg Gratings in radiation hard fibers for sensing applications in nuclear environments.

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NEW PRODUCT SERVICE FOR STRAIN TESTING

FemtoFiberTec is proud to announce its new strain testing service for femtosecond(fs)-laser-written FBGs.

>>

SECOND PRODUCTION LINE COMING IN 2016

Due to the increasing demand and growth in 2015, we will set-up a second production line in 2016.

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Benefits

Extreme temperature stability up to 1,000°C

Significantly higher tensile strength then strip and recoat gratings

Immunity to humidity, radioactivity and electromagnetic interference

Highly flexible writing technology allows for customer individual FBG specifications

Long-range FBG arrays of several kilometers in length, with single FBG distances of only a few mm

Worldwide leading, automated manufacturing technology in terms of cost efficiency

HIGHLY VERSATILE APPLICATIONS

Due to the extreme flexibility of the fs-writing technology, FemtoFiberTec can serve a broad range of FBG sensing applications. Along with special FBGs for temperature, strain, pressure, vibration measurement etc., it is possible to provide long-range FBG arrays of several kilometers length with single FBG distances of only a few mm. Due to their high temperature stability and strength, fs-written FBGs can be used very effective in harsh and/or demanding environments.

  • Wind Turbine
  • Well and Pipeline Monitoring
  • Medical Technology
  • Industrial Process Control
  • Aerospace
  • Distributed Temperature Sensing (DTS)
  • Smart Structures
  • Power Plant Control
  • Exhaust Control
  • Engine Monitoring
  • Fire Protection
  • Battery Management

CUSTOMER INDIVIDUAL PRODUCTS

The flexible fs-writing process allows FemtoFiberTec to offer an outstanding variety of FBG specifications. Besides the standard FBG portfolio for sensing applications, FemtoFiberTec offers highly customized FBG production for special applications. The fs-writing technology allows for writing FBGs and waveguides into any kind of optically transparent material and through a variety of coatings.

INDIVIDUALproducts

  • FBG TYPES
  • FBG SPECIFICATIONS
  • FIBER OPTIONS
  • FIBER COATINGS
  • FBG DURABILITY
  • Single FBGs
  • FBG arrays
  • Apodized FBGs
  • Chirped and PI-shifted FBGs
  • Bragg wavelength 1460nm-1640nm (others on request)
  • Wavelength tolerance
  • FWHM: 0.3nm to several nm
  • Reflectivity: 10-4 to 99%
  • Sideband suppression (apodized): up to 20dB
  • Standard single mode fiber
  • Pure silica core fiber
  • Special fibers and materials like sapphire or laser fiber
  • Acrylate coating
  • Polyimide (PI) coating
  • Carbon coating
  • Gold coating
  • Temperature for PI-coated fibers up to 300 °C
  • FBG temperature up to 1.000°C
  • Tensile strength >200kpsi
FBG TYPES
  • Single FBGs
  • FBG arrays
  • Apodized FBGs
  • Chirped and PI-shifted FBGs
FBG SPECIFICATIONS
  • Bragg wavelength 1460nm-1640nm (others on request)
  • Wavelength tolerance
  • FWHM: 0.3nm to several nm
  • Reflectivity: 10-4 to 99%
  • Sideband suppression (apodized): up to 20dB
FIBER OPTIONS
  • Standard single mode fiber
  • Pure silica core fiber
  • Special fibers and materials like sapphire or laser fiber
FIBER COATINGS
  • Acrylate coating
  • Polyimide (PI) coating
  • Carbon coating
  • Gold coating
FBG DURABILITY
  • Temperature for PI-coated fibers up to 300 °C
  • FBG temperature up to 1.000°C
  • Tensile strength >200kpsi

STANDARDproducts

Besides customer specific FBG solutions, FemtoFiberTec offers an attractive range of standardized
fs-written FBGs. Due to the worldwide leading, automated manufacturing technology, FemtoFiberTec
can provide high customer value in terms of quality and cost efficiency.

Acrylate coated SM fiber Art. Nr. Item Description Wavelength Reflectivity (%) 3dB Bandwidth (nm) (%) SLRS (dB) Length
Low Reflectivity FFT.FBG.S.00.01 Single FBG - 20% - AC 1500-1600 > 20 0,4 > 15 < 5mm
Medium Reflectivity FFT.FBG.S.00.02 Single FBG - 50% - AC 1500-1600 > 50 0,4 > 15 < 5mm
High Reflectivity FFT.FBG.S.00.03 Single FBG - 70% - AC 1500-1600 > 70 0,5 > 15 < 5mm
PI coated SM fiber Art. Nr. Item Description Wavelength Reflectivity (%) 3dB Bandwidth (nm) (%) SLRS (dB) Length
Low Reflectivity FFT.FBG.S.01.01 Single FBG - 20% - PI 1500-1600 > 20 0,4 > 15 < 5mm
Medium Reflectivity FFT.FBG.S.01.02 Single FBG - 50% - PI 1500-1600 > 50 0,4 > 15 < 5mm
High Reflectivity FFT.FBG.S.01.02 Single FBG - 70% - PI 1500-1600 > 70 0,5 > 15 < 5mm
PI coated pure core fiber Art. Nr. Item Description Wavelength Reflectivity (%) 3dB Bandwidth (nm) (%) SLRS (dB) Length
Low Reflectivity FFT.FBG.S.02.01 Single FBG - 20% - PC-PI 1500-1600 > 20 0,4 > 15 < 5mm
Medium Reflectivity FFT.FBG.S.02.02 Single FBG - 50% - PC-PI 1500-1600 > 50 0,4 > 15 < 5mm
Medium Reflectivity FFT.FBG.S.02.03 Single FBG - 70% - PC-PI 1500-1600 > 70 0,5 > 15 < 5mm

Technologically Superior

  • About the Technology
  • Benefits compared to conventional FBGs
  • Benefits compared to other sensing solutions

The FBG is an optical filtering device that reflects light on a specific wavelength and is present within the core of an optical fiber waveguide. Due to the wavelength dependence on temperature and strain, FBGs are increasingly used as fiber optical strain and temperature sensors.

FemtoFiberTec uses a special inscription technology for FBGs based on infrared fs-Laser technology.
The Laser is focused into the core of the fiber and induces local refractive index changes in a point-by-point writing process. The process is highly nonlinear and therefore basically independent of the fiber material, which means that doping the fiber (e.g. Germanium) is not required. The FBGs can be written in radiation insensitive fibers and special pure core fibers for harsh environments. The gratings are type II gratings
with temperature stability up to 1,000°C. As the process is applied through the coating, no stripping and recoating of the fiber is required. Furthermore, waveguides and FBGs can be written into the cladding of the fiber to achieve radially distributed arrays of FBGs for 3D shape sensing.

FemtoFiberTec’s manufacturing process is highly advanced in terms of scalability and cost efficiency.

BENEFITS

compared to conventional FBGs

  • Type II gratings with temperature stability up to 1,000°C
  • Immunity to humidity and radioactivity
  • Significantly higher tensile strength compared to Strip and Recoat Technology
  • Significantly higher reflectivity and lower fiber cost compared to Draw Tower Technology
  • Direct writing process into customer specific fibers
  • Writing of waveguides and FBGs into the cladding (3D shape sensing)
  • Realization of customer individual specifications

BENEFITS

compared to other sensing technologies

  • Immunity to electromagnetic fields
    FBGs are completely immune to interference from electromagnetic, electrostatic or radio frequency sources. It is possible to install them in locations with severe electrical noise such as power generation and transmission plants. Furthermore, FGBs are 100% intrinsically safe and can be used in the most explosive environments.
  • Applicable in harsh environments
    Due to the completely passive nature of FBGs, without using any electronic components, they are capable of operating under extreme temperatures. They offer long-term stability in extreme environments where electronic sensors are unable to operate.
  • Multiplexing
    Several thousand FBGs can be written into one optical fiber and simultaneously interrogated by one multi-channel instrument. This provides a very low-cost mechanism compared with technologies where every sensor has a dedicated channel.
  • Small Size
    The fiber into which FBGs are written is very small and lightweight. That means that many sensors can be applied to a structure with very little intrusion. Uniquely, a fiber sensor array can be embedded inside a composite material in order to monitor internal strain, temperature and damage with no effect on the structural performance of the composite.
About the Technology

The FBG is an optical filtering device that reflects light on a specific wavelength and is present within the core of an optical fiber waveguide. Due to the wavelength dependence on temperature and strain, FBGs are increasingly used as fiber optical strain and temperature sensors.

FemtoFiberTec uses a special inscription technology for FBGs based on infrared fs-Laser technology.
The Laser is focused into the core of the fiber and induces local refractive index changes in a point-by-point writing process. The process is highly nonlinear and therefore basically independent of the fiber material, which means that doping the fiber (e.g. Germanium) is not required. The FBGs can be written in radiation insensitive fibers and special pure core fibers for harsh environments. The gratings are type II gratings
with temperature stability up to 1,000°C. As the process is applied through the coating, no stripping and recoating of the fiber is required. Furthermore, waveguides and FBGs can be written into the cladding of the fiber to achieve radially distributed arrays of FBGs for 3D shape sensing.

FemtoFiberTec’s manufacturing process is highly advanced in terms of scalability and cost efficiency.

Benefits compared to conventional FBGs

BENEFITS

compared to conventional FBGs

  • Type II gratings with temperature stability up to 1,000°C
  • Immunity to humidity and radioactivity
  • Significantly higher tensile strength compared to Strip and Recoat Technology
  • Significantly higher reflectivity and lower fiber cost compared to Draw Tower Technology
  • Direct writing process into customer specific fibers
  • Writing of waveguides and FBGs into the cladding (3D shape sensing)
  • Realization of customer individual specifications
Benefits compared to other sensing solutions

BENEFITS

compared to other sensing technologies

  • Immunity to electromagnetic fields
    FBGs are completely immune to interference from electromagnetic, electrostatic or radio frequency sources. It is possible to install them in locations with severe electrical noise such as power generation and transmission plants. Furthermore, FGBs are 100% intrinsically safe and can be used in the most explosive environments.
  • Applicable in harsh environments
    Due to the completely passive nature of FBGs, without using any electronic components, they are capable of operating under extreme temperatures. They offer long-term stability in extreme environments where electronic sensors are unable to operate.
  • Multiplexing
    Several thousand FBGs can be written into one optical fiber and simultaneously interrogated by one multi-channel instrument. This provides a very low-cost mechanism compared with technologies where every sensor has a dedicated channel.
  • Small Size
    The fiber into which FBGs are written is very small and lightweight. That means that many sensors can be applied to a structure with very little intrusion. Uniquely, a fiber sensor array can be embedded inside a composite material in order to monitor internal strain, temperature and damage with no effect on the structural performance of the composite.

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FemtoFiberTec GmbH

Production
Am Stollen 19
38640 Goslar
Germany


Sales and Administration
Oberlandstrasse 13/14
12099 Berlin
Germany

Phone: +49 (0) 30 62 88 73 0
Mobile: +49 (0) 157 50 96 90 15
Fax: +49 (0) 30 62 88 73 1
E-mail: sales@femtofibertec.de