Analyses of unintentional intensity modulation in all-fiber acousto-optic tunable filters.
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.
Lee
Kwang Jo
KJ
Department of Physics, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju, 500-757, Korea. kjl@kaist.ac.kr
Hwang
In-Kag
IK
Park
Hyun Chul
HC
Nam
Ki Hak
KH
Kim
Byoung Yoon
BY