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 specialty fibers as well as low-cost commodity fibers. The FEMTO Gratings are of superior tensile strength, withstand temperatures of up to 1,000°C and can be immune to radioactivity and humidity. The product line of FEMTOPlus® Gratings additionally provides extremely low polarization (0-5pm) for high resolution measurements and very low scattering loss (<0,2dB) for extra-long array configurations.

Hundreds 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 strengths open up unprecedented possibilities for advanced fiber optical sensing solutions. This is sensing in a new dimension.

OFS26, LAUSANNE, CH

Meet us from Sept 24th to 28th, 2018 at the International Conference on Optical Fiber Sensors (OFS 26) in Lausanne, Switzerland.

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SENSOR + TEST 2018, NUREMBERG, GERMANY

Meet us and our engionic group companies from June 26th to 28th, 2018 in Nuremberg.

>>

APOS 2018, SHIMANE, JAPAN

Meet us from May 28th to 31st, 2018 in Shimane.

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BENEFITS

Temperature stability up to 1,000°C and immunity to humidity, radioactivity and electromagnetic interference

Significantly higher tensile strength then strip and recoat gratings

Highly flexible writing technology allows for customer individual FBG specifications

FEMTOPlus® Gratings -
negative polarization effects eliminated for best measurement results and very low scattering losses for extra-long array configurations

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, 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 of FemtoFiberTec offers 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 can inscribe FBGs and waveguides into any kind of optically transparent material and through a broad variety of coatings.

Femto Fiber Tec - FBG Types

INDIVIDUALproducts

  • FBG SPECIFICATIONS
  • ARRAY SPECIFICATIONS
  • FIBER OPTIONS
  • COATING OPTIONS
  • Bragg wavelength 1460nm-1640nm (others on request)
  • Wavelength tolerance <0.2 nm
  • FWHM: 0.1nm to several nm
  • Reflectivity: 10-4 to 99%
  • Sideband suppression (apodized): up to 20dB
  • FBG length: 0,06mm to 12mm
  • Low polarization dependence option from 0-5pm
  • Low scattering loss option of <0,2dB

Wavelength-distributed sensing ARRAYs

  • For spectrometer, scanning laser, tunable filter or AWG interrogation systems
  • Typically up to approx. 50 FBGs per array, depending on interrogation unit
    bandwidth and required measurement range
  • Each FBG with individual wavelength and reflectivity typically between 30% and 70%
  • Narrow FBG spacing starting from 1mm possible

Quasi-distributed sensing ARRAYs

  • For OTDR and OFDR interrogation systems
  • Number of sensors typically in the range of several thousand FBGs per sensing cable
  • Each FBG with similar wavelength and reflectivity typically between -45dB and -35dB
  • Narrow FBG spacing starting from 1mm possible
  • Standard single mode fiber (germanium doped fibers)
  • Bend insensitive fiber (e.g. trench fibers)
  • Pure silica core fiber
  • Radiation hard fiber (e.g. fluorine doped fiber)
  • Special fibers and materials like sapphire or laser fiber
  • Acrylate coating (standard up to 85°C & high temperature acrylate up to 180°C)
  • Polyimide (PI) coating for temperatures up to 300°C (400°C short term)
  • Carbon coating for hermetic sealing
  • Fiber ruggedization with extra buffers (e.g. PEEK)
FBG SPECIFICATIONS
  • Bragg wavelength 1460nm-1640nm (others on request)
  • Wavelength tolerance <0.2 nm
  • FWHM: 0.1nm to several nm
  • Reflectivity: 10-4 to 99%
  • Sideband suppression (apodized): up to 20dB
  • FBG length: 0,06mm to 12mm
  • Low polarization dependence option from 0-5pm
  • Low scattering loss option of <0,2dB
ARRAY SPECIFICATIONS

Wavelength-distributed sensing ARRAYs

  • For spectrometer, scanning laser, tunable filter or AWG interrogation systems
  • Typically up to approx. 50 FBGs per array, depending on interrogation unit
    bandwidth and required measurement range
  • Each FBG with individual wavelength and reflectivity typically between 30% and 70%
  • Narrow FBG spacing starting from 1mm possible

Quasi-distributed sensing ARRAYs

  • For OTDR and OFDR interrogation systems
  • Number of sensors typically in the range of several thousand FBGs per sensing cable
  • Each FBG with similar wavelength and reflectivity typically between -45dB and -35dB
  • Narrow FBG spacing starting from 1mm possible
FIBER OPTIONS
  • Standard single mode fiber (germanium doped fibers)
  • Bend insensitive fiber (e.g. trench fibers)
  • Pure silica core fiber
  • Radiation hard fiber (e.g. fluorine doped fiber)
  • Special fibers and materials like sapphire or laser fiber
COATING OPTIONS
  • Acrylate coating (standard up to 85°C & high temperature acrylate up to 180°C)
  • Polyimide (PI) coating for temperatures up to 300°C (400°C short term)
  • Carbon coating for hermetic sealing
  • Fiber ruggedization with extra buffers (e.g. PEEK)

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.

FEMTO Grating

Acrylate coated SM fiber Art. Nr. Item Description Wavelength Reflectivity (%) FWHM (nm) SLRS (dB) Length
Low Reflectivity FFT.FBG.S.00.01 Single FBG - 20% - AC 1500-1600 > 20 < 0,5 > 15 < 6mm
Medium Reflectivity FFT.FBG.S.00.02 Single FBG - 50% - AC 1500-1600 > 50 < 0,5 > 15 < 6mm
High Reflectivity FFT.FBG.S.00.03 Single FBG - 70% - AC 1500-1600 > 70 < 0,6 > 15 < 6mm
Download Data Sheet
PI coated SM fiber Art. Nr. Item Description Wavelength Reflectivity (%) FWHM (nm) SLRS (dB) Length
Low Reflectivity FFT.FBG.S.01.01 Single FBG - 20% - PI 1500-1600 > 20 < 0,5 > 15 < 6mm
Medium Reflectivity FFT.FBG.S.01.02 Single FBG - 50% - PI 1500-1600 > 50 < 0,5 > 15 < 6mm
High Reflectivity FFT.FBG.S.01.02 Single FBG - 70% - PI 1500-1600 > 70 < 0,6 > 15 < 6mm
Download Data Sheet
PI coated pure core fiber Art. Nr. Item Description Wavelength Reflectivity (%) FWHM (nm) SLRS (dB) Length
Low Reflectivity FFT.FBG.S.02.01 Single FBG - 20% - PC-PI 1500-1600 > 20 < 0,5 > 15 < 6mm
Medium Reflectivity FFT.FBG.S.02.02 Single FBG - 50% - PC-PI 1500-1600 > 50 < 0,5 > 15 < 6mm
High Reflectivity FFT.FBG.S.02.03 Single FBG - 70% - PC-PI 1500-1600 > 70 < 0,6 > 15 < 6mm
Download Data Sheet

 

FEMTOPlus® Grating

Acrylate coated SM fiber Art. Nr. Item Description Wavelength Reflectivity (%) FWHM (nm) SLRS (dB) Length
Low Reflectivity FFT.FBG.P.00.01 Single FBG - 20% - AC 1500-1600 > 20 < 0,3 > 15 6mm
Medium Reflectivity FFT.FBG.P.00.02 Single FBG - 50% - AC 1500-1600 > 50 < 0,2 > 15 12mm
Download Data Sheet
PI coated SM fiber Art. Nr. Item Description Wavelength Reflectivity (%) FWHM (nm) SLRS (dB) Length
Low Reflectivity FFT.FBG.P.01.01 Single FBG - 20% - PI 1500-1600 > 20 < 0,3 > 15 6mm
Medium Reflectivity FFT.FBG.P.01.02 Single FBG - 50% - PI 1500-1600 > 50 < 0,2 > 15 12mm
Download Data Sheet
PI coated pure core fiber Art. Nr. Item Description Wavelength Reflectivity (%) FWHM (nm) SLRS (dB) Length
Low Reflectivity FFT.FBG.P.02.01 Single FBG - 20% - PC-PI 1500-1600 > 20 < 0,3 > 15 6mm
Medium Reflectivity FFT.FBG.P.02.02 Single FBG - 50% - PC-PI 1500-1600 > 50 < 0,2 > 15 12mm
Download Data Sheet

FEMTO Grating arrays and FEMTOPlus® Grating arrays will be produced according to customer specifications.

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
  • Cost efficient arrays compared to strip and recoat gratings
  • Immunity to humidity and radioactivity
  • Significantly higher tensile strength compared to strip and recoat technology
  • FEMTOPlus® Gratings with low polarization (0-5pm) for high resolution measurements compared to draw tower gratings and very low scattering losses (< 0,2dB)
  • Significantly higher reflectivity and lower fiber cost compared to Draw Tower Technology
  • Direct writing process into customer specific fibers
  • Realisation of customer individual specifications
  • Highly cost competitive large volume manufacturing process

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
  • Cost efficient arrays compared to strip and recoat gratings
  • Immunity to humidity and radioactivity
  • Significantly higher tensile strength compared to strip and recoat technology
  • FEMTOPlus® Gratings with low polarization (0-5pm) for high resolution measurements compared to draw tower gratings and very low scattering losses (< 0,2dB)
  • Significantly higher reflectivity and lower fiber cost compared to Draw Tower Technology
  • Direct writing process into customer specific fibers
  • Realisation of customer individual specifications
  • Highly cost competitive large volume manufacturing process
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
Ernst-Lau-Straße 8
12489 Berlin
Germany

Phone: +49 (0) 30 62 88 73 0
Fax: +49 (0) 30 62 88 73 49
E-mail: sales@femtofibertec.de