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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| Published in | Optics letters Vol. 41; no. 9; p. 2017 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
United States
01.05.2016
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| Online Access | Get more information |
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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 <100 pm transmission bandwidth are presented. Their application as highly narrow micro-resonators and notch filters seems feasible. |
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| ISSN: | 1539-4794 |
| DOI: | 10.1364/ol.41.002017 |