Effect of metal coating in all-fiber acousto-optic tunable filter using torsional wave

Abstract

Torsional mode acousto-optic tunable filter (AOTF) is demonstrated using a metal-coated birefringent optical fiber for an improved robustness. The changes in acoustic and optical properties of a metal-coated birefringent optical fiber induced by the thin metal coating were analyzed experimentally and theoretically. The filter wavelength shift is successfully explained as a result of combined effect of acoustic wavelength change and optical birefringence change. We also demonstrated a small form-factor configuration by coiling the fiber with 6 cm diameter without performance degradation. The center wavelength of the filter can be tuned >35 nm by changing the applied frequency, and the coupling efficiency is higher than 92% with <5 nm 3-dB bandwidth.

Acousto-optic interaction in polyimide coated optical fibers with flexural waves

“…The combination of moisture and stress can cause microscopic flaws in the glass to propagate, resulting in fiber failure [13]. Recently, acoustooptic coupling using torsional waves was demonstrated in a thin metal-coated optical fiber [14]. The metal coating, in the order of a hundred nm thick, provides low attenuation of the elastic wave and surface protection of the fiber, but still fiber handling is compromised.…”

A new modulation method to generate all-optical logic gates in an AOTF

“…toptica.com/products/terahertz_generation; Wake et al 1996;Fice et al 2012;Islam 2012;Bhatti et al 2000;Lima Júnior et al 2009;Ferreira et al 2012Ferreira et al , 2009Alvarado et al 1993;Novitsky 2013;Sobrinho et al 2002Sobrinho et al , 2008Tamai et al 2009;Huiszoon et al 2009;Onaka et al 2008;Veeriah et al 2007;Katrasnik et al 2010;Gupta et al 2012;Sabóia and Ferreira 2009;Mazzali and Fragnito 1998;Sobrinho and Sombra 2002;Tran 1997;Jung et al 2005;Yariv and Yeh 1984;Xu and Stroud 1992;Xie et al 2013;Sobrinho 2002;Song et al 2014;Mantsevich 2015). Information technology and high, medium or low capacity transmission systems can be potentially improved by the incorporation of all-optical devices.…”

“…The acousto-optic tunable filter (AOTF) has been considered as a strategic optical dispositive for optical communication due your compact size, high-speed switching and wideband wavelength selectivity (Onaka et al 2008;Veeriah et al 2007;Katrasnik et al 2010;Gupta et al 2012;Sabóia and Ferreira 2009;Sobrinho and Sombra 2002;Sobrinho et al 2002;Tran 1997;Jung et al 2005;Yariv and Yeh 1984;Xu and Stroud 1992;Xie et al 2013;Song et al 2014;Mantsevich et al 2015). An all-fiber tunable Mach-Zehnder interferometer based on an AOTF was demonstrated experimentally to have high performance .…”