Photonic Hydrophones Based on Coated Fiber Bragg Gratings.
Photonic Hydrophones Based on Coated Fiber Bragg Gratings. Photonic Hydrophones Based on Coated Fiber Bragg Gratings.
Optoelectronic Division, Engineering Department Interferometric detection J.A. Bucaro et al.(1977) Intensity modulation W.B. Spillman et al.(1980) University of Sannio, Benevento (Italy) SOCIETÀ ITALIANA DI FISICA XCVIII CONGRESSO NAZIONALE Napoli, 17-21 Settembre 2012
Optoelectronic Division, Engineering Department University of Sannio, Benevento (Italy) Fiber Bragg Grating (FBG) The maximum reflectivity occurs at the wavelength that matches the Bragg condition: SOCIETÀ ITALIANA DI FISICA XCVIII CONGRESSO NAZIONALE Napoli, 17-21 Settembre 2012 A Fiber Bragg Grating is a longitudinal periodic variation of the refractive index in the core of an optical fiber where n eff0 is the effective refractive index of the guided mode and Λ 0 is the FBG period Any effect able to modify the physical and geometrical features of the grating can lead to a shift in the Bragg wavelength A strain variation shifts the Bragg wavelength through dilating or compressing the grating and changing the effective index (via the elasto-optic effect) 2 neff z p11xp12zy, 2 0
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Optoelectr<strong>on</strong>ic Divisi<strong>on</strong>, Engineering Department<br />
University of Sannio, Benevento (Italy)<br />
<strong>Fiber</strong> <strong>Bragg</strong> Grating (FBG)<br />
The maximum reflectivity occurs at the wavelength that matches the <strong>Bragg</strong> c<strong>on</strong>diti<strong>on</strong>:<br />
SOCIETÀ ITALIANA DI FISICA<br />
XCVIII CONGRESSO NAZIONALE<br />
Napoli, 17-21 Settembre 2012<br />
A <strong>Fiber</strong> <strong>Bragg</strong> Grating is a l<strong>on</strong>gitudinal periodic variati<strong>on</strong> of the refractive index in the core of an optical fiber<br />
where n eff0 is the effective refractive index of the guided mode and Λ 0 is the FBG period<br />
Any effect able to modify the physical and geometrical features of the grating can lead to a shift in the <strong>Bragg</strong> wavelength<br />
A strain variati<strong>on</strong> shifts the <strong>Bragg</strong> wavelength through dilating or compressing the grating and changing<br />
the effective index (via the elasto-optic effect)<br />
2<br />
<br />
neff<br />
z p11xp12zy, 2 <br />
0
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