A simple method for fabricating phase-shifted fibre Bragg gratings with flexible choice of centre wavelength

Edmon Chehura; Stephen W. James; Ralph P. Tatam

doi:10.1117/12.835466

5 October 2009 A simple method for fabricating phase-shifted fibre Bragg gratings with flexible choice of centre wavelength

Edmon Chehura, Stephen W. James, Ralph P. Tatam

Author Affiliations +

Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 750379 (2009) https://doi.org/10.1117/12.835466
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

Abstract

A simple technique for fabricating phase-shifted fibre Bragg gratings (PSFBGs) without the use of a phase-shifted phase mask is presented. Two, 3-mm long, standard fibre Bragg gratings (FBGs) were inscribed sequentially in singlemode fibre at the same Bragg wavelength such that the FBGs physically overlapped by one grating period. This induces a spectral-hole in the middle of the reflection spectrum of a standard FBG, equivalent to a π-phase shifted FBG. The flexibility of the technique in writing PSFBGs at any choice of wavelength is demonstrated. The results show that PSFBG devices produced by this method are highly reproducible and the process is fast.

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Edmon Chehura, Stephen W. James, and Ralph P. Tatam "A simple method for fabricating phase-shifted fibre Bragg gratings with flexible choice of centre wavelength", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 750379 (5 October 2009); https://doi.org/10.1117/12.835466

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