Observation of symmetrical reflection sidebands in a silica suspended-core fiber Bragg grating

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...

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Bibliographic Details
Published in:Optics express 2010-08, Vol.18 (16), p.17373-17381
Main Authors: Tse, M L V, Chung, K M, Dong, L, Thomas, B K, Fu, L B, Cheng, K C D, Lu, C, Tam, H Y
Format: Article
Language:English
Subjects:
Equipment Design
Fiber Optic Technology - instrumentation
Light
Optical Fibers
Refractometry - instrumentation
Silicon Dioxide
Temperature
Transducers
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Summary: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.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.18.017373