Tse MLV, Chung KM, Dong L, Thomas BK, Fu LB, Cheng KCD, Lu C, Tam HY. Observation of symmetrical reflection sidebands in a silica suspended-core fiber Bragg grating.
OPTICS EXPRESS 2010;
18:17373-17381. [PMID:
20721124 DOI:
10.1364/oe.18.017373]
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Abstract
We have observed symmetrical sidebands in reflection from Bragg grating written in a silica suspended-core fiber, which are caused by longitudinal periodic refractive index modulation in the Ge-doped suspended-core fiber with a core diameter of approximately 1.3 microm. Our simulation shows that the effective refractive index of the guided mode varied by 0.023% along the fiber with a period of approximately 650 microm. The periodic index variation can lead to amplitude modulation of fiber Bragg gratings, which can be studied by observing the spectra of a fiber Bragg grating written in the Ge-doped core. In addition, we have also characterized the temperature and strain responses of the fiber Bragg gratings, and showed that both responses in the suspended-core fiber are 20 to 25% lower than that of a fiber Bragg grating written on a conventional fiber.
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