Femtosecond inscription of phase-shifted gratings by overlaid fiber Bragg gratings

Two slightly shifted gratings are inscribed, one over the other, in an SMF fiber with a femtosecond laser and a phase mask. The transmission spectrum of the complex structure is similar to that of a phase-shifted grating; yet, the fabrication process is fast and simple compared to standard methods....

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Bibliographic Details
Published in:Optics letters 2016-05, Vol.41 (9), p.2017-2020
Main Authors: Shamir, Avishay, Ishaaya, Amiel A
Format: Article
Language:English
Subjects:
Diffraction gratings
Feasibility
Femtosecond
Fibers
Gratings (spectra)
Lasers
Transmission loss
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Summary:Two slightly shifted gratings are inscribed, one over the other, in an SMF fiber with a femtosecond laser and a phase mask. The transmission spectrum of the complex structure is similar to that of a phase-shifted grating; yet, the fabrication process is fast and simple compared to standard methods. High-quality semi-phase-shifted gratings with -24  dB transmission loss and
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.41.002017