Acousto-optic Interaction in Biconical Tapered Fibers: Shaping of the Stopbands

GUSTAVO RAMÍREZ-MELÉAUNIVERSIDAD AUTÓNOMA DE SAN LUIS POTOSÍ, INSTITUTO DE INVESTIGACIÓN EN COMUNICACIÓN ÓPTICA, AV. KARAKORUM 1470 LOMAS 4A SECC., 78210 SAN LUIS POTOSÍ, S.L.P, MÉXICONDEZ; MIGUEL ÁNGEL BELLO-JIMÉNEZ; CUADRADO LABORDE, CHRISTIAN; ANTONIO DIEZ; CRUZ, JOSE LUIS; RODRIGUEZ COBOS, A; RAÚL BALDERAS-NAVARRO; ANDRES BOU, MIGUEL

OPTICAL ENGINEERING

SPIE-SOC PHOTOPTICAL INSTRUMENTATION ENGINEERS

Año: 2016 vol. 55 p. 361051 - 361058

0091-3286

The effect of a gradual reduction of the fiber diameter on the acousto-optic (AO) interaction is reported. The experimental and theoretical study of the intermodal coupling induced by a flexural acoustic wave in a biconical tapered fiber shows that it is possible to shape the transmission spectrum, for example, substantially broadening the bandwidth of the resonant couplings. The geometry of the taper transitions can be regarded as an extra degree of freedom to design the AO devices. Optical bandwidths above 45 nm are reported in a tapered fiber with a gradual reduction of the fiber down to 70 μm diameter. The effect of including long taper transition is also reported in a double-tapered structure. A flat attenuation response is reported with 3-dB stopband bandwidth of 34 nm. © 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)