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Fiber Bragg gratings with suppressed cladding modes made in SMF-28 with a femtosecond IR laser and a phase mask

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5 Author(s)
Grobnic, D. ; Commun. Res. Centre Canada, Ottawa, Ont., Canada ; Smelser, C.W. ; Mihailov, S.J. ; Walker, R.B.
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High reflectivity fiber Bragg gratings (FBG) with strong cladding mode suppression were written in standard telecom fiber (SMF-28) with femtosecond 800-nm laser pulses and a phase mask. No special fiber photosensitization or fiber design was required. Induced index modulations were created by two-beam interference from the phase mask in both the core and cladding region, which resulted in cladding-mode coupling loss <0.1 dB for a high reflecting -30 dB in transmission FBG.

Published in:

Photonics Technology Letters, IEEE  (Volume:16 ,  Issue: 8 )

Date of Publication:

Aug. 2004

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