Bulk regeneration of optical fiber Bragg gratings.

The reliability and reproducibility of regenerated gratings for mass production is assessed through simultaneous bulk regeneration of 10 gratings. The gratings are characterized and variations are compared after each stage of fabrication, including seed (room-temperature UV fabrication), regeneration (annealing at 850°C), and postannealing (annealing at 1100°C). In terms of Bragg wavelength (λ(B)), the seed grating variation lies within Δλ(B)=0.16 nm, the regenerated grating within Δλ(B)=0.41 nm, and the postannealed grating within Δλ(B)=1.42 nm. All the results are within reasonable error, indicating that mass production is feasible. The observable spread in parameters from seed to regenerated grating is clearly systematic. The postannealed spread arises from the small tension on the fiber during postannealing and can be explained by the softening of the glass when the strain temperature of silica is reached.

[1]  Minwei Yang,et al.  Fiber Bragg gratings with enhanced thermal stability by residual stress relaxation. , 2009, Optics express.

[2]  M Aslund,et al.  Annealing properties of gratings written into UV-presensitized hydrogen-outdiffused optical fiber. , 2000, Optics letters.

[3]  S. Mihailov,et al.  Long-term thermal stability tests at 1000 °C of silica fibre Bragg gratings made with ultrafast laser radiation , 2006 .

[4]  T. Erdogan.  Fiber grating spectra , 1997 .

[5]  John Canning,et al.  Thermal stabilization of Type I fiber Bragg gratings for operation up to 600 degrees C. , 2010, Optics letters.

[6]  J. Canning.  Fibre gratings and devices for sensors and lasers , 2008 .

[7]  John Canning,et al.  Extreme Silica Optical Fibre Gratings , 2008, Sensors.

[8]  John Canning,et al.  Enhanced type IIA gratings for high-temperature operation. , 2004, Optics letters.

[9]  John Canning,et al.  Ultrahigh-temperature regenerated gratings in boron-codoped germanosilicate optical fiber using 193 nm. , 2008, Optics letters.

[10]  M Stevenson,et al.  A study of regenerated gratings produced in germanosilicate fibers by high temperature annealing. , 2011, Optics express.

[11]  D. Inaudi,et al.  Fiber Optic Sensing for Innovative Oil & Gas Production and Transport Systems , 2006 .

[12]  John Canning,et al.  Thermal regenerated type IIa fiber Bragg gratings for ultra-high temperature operation , 2011 .

[13]  Stephen J. Mihailov,et al.  Fiber Bragg Grating Sensors for Harsh Environments , 2012, Sensors.

[14]  John Canning,et al.  Regenerated Gratings for Optical Sensing in Harsh Environments , 2012 .