Abstract
We theoretically and experimentally analyze unintentional intensity modulation phenomena in two types of all-fiber acousto-optic tunable filters utilizing flexural and torsional acoustic waves. Output filter signal at a resonant wavelength shows time-varying oscillations with even- and odd-order harmonics of applied acoustic frequency, which are explained by two factors of static mode coupling and acoustic back reflection. The magnitudes of static coupling and acoustic reflection in our devices are estimated from the measured first and second harmonic modulation powers.
Highlights
Various types of tunable optical filters such as Fabry Perot interferometer, fiber Bragg grating, electro-optical tunable filter, and ring resonator tunable filter are in common use in optical communication and sensor systems [1]
Output filter signal at a resonant wavelength shows time-varying oscillations with evenand odd-order harmonics of applied acoustic frequency, which are explained by two factors of static mode coupling and acoustic back reflection
The all-fiber acousto-optic tunable filters (AOTFs) have been demonstrated based on wavelength selective acousto-optic (AO) mode coupling by traveling flexural [2, 3] or torsional acoustic wave [4,5,6]
Summary
Various types of tunable optical filters such as Fabry Perot interferometer, fiber Bragg grating, electro-optical tunable filter, and ring resonator tunable filter are in common use in optical communication and sensor systems [1]. Abstract: We theoretically and experimentally analyze unintentional intensity modulation phenomena in two types of all-fiber acousto-optic tunable filters utilizing flexural and torsional acoustic waves. Output filter signal at a resonant wavelength shows time-varying oscillations with evenand odd-order harmonics of applied acoustic frequency, which are explained by two factors of static mode coupling and acoustic back reflection.
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