(IEEE, 2006) Del Villar, Ignacio; Achaerandio Alvira, Miguel; Arregui San Martín, Francisco Javier; Matías Maestro, Ignacio; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa; Gobierno de Navarra / Nafarroako Gobernua
The inscription of cascaded long-period gratings of
different periods in optical fiber permits us to obtain both narrowband
and wideband filters in the same spectrum. If used as an
optical transducer, it may permit us to detect with the same device-
wide and small parameter changes. The transmission spectra
have been simulated using a theoretical model based on LP mode
coupling and have been also experimentally demonstrated.
(Optical Society of America, 2006) Del Villar, Ignacio; Corres Sanz, Jesús María; Achaerandio Alvira, Miguel; Arregui San Martín, Francisco Javier; Matías Maestro, Ignacio; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
The incremental deposition of a thin overlay on the cladding of a
long-period fiber grating (LPFG) induces important resonance wavelength
shifts in the transmission spectrum. The phenomenon is proved theoretically
with a vectorial method based on hybrid modes and coupled mode theory,
and experimentally with electrostatic self-assembly monolayer process. The
phenomenon is repeated periodically for specific overlay thickness values
with the particularity that the shape of the resonance wavelength shift
depends on the thickness of the overlay. The main applications are the
design of wide optical filters and multiparameter sensing devices.
