Regenerated gratings

J. Canning; S. Bandyopadhyay; M. Stevenson; P. Biswas; J. Fenton; M. Aslund

doi:10.2971/jeos.2009.09052

Journal of the European Optical Society - Rapid publications, Vol 4 (2009)

Regenerated gratings

J. Canning, S. Bandyopadhyay, M. Stevenson, P. Biswas, J. Fenton, M. Aslund

Abstract

Strong regenerated gratings with a maximum grating strength exceeding (40-50) dB are fabricated inside an optical fibre by bulk macro thermal processing ~900Â°C using a UV-laser seeded Bragg grating. Further annealing between 1000 and 1100Â°C leads to a stabilised grating ~18dB in strength. This suffers no further degradation at 1100Â°C for the period monitored, over 4 hrs. The potential resolution of this process is demonstrated by regenerating two complex profiles. Phase information is retained between seed and regenerated structures. This opens the way for nano-engineering of materials using thermal processing and seed templates.

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