2 February 2009 Analysis on the signal crosstalk of TeO2 acousto-optic tunable filters used in optical communication
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As an optical sensor and controller in wavelength division multiplexing (WDM) system, the acousto-optic tunable filter (AOTF) is one of powerfully several potential sensing candidates. The AOTF can easily achieve dynamically to add/ drop arbitrary wavelength by changing the RF frequency in its range of working wavelength. In this paper, the reason of the signal crosstalk is given and its characteristic of sidelobe is firstly analyzed on the momentum matching condition. The coupling equations with multiple acoustic waves traveling simultaneously are presented. The analytic solution of the diffraction efficiency for the two acoustic frequencies is given, and its impact on the device performances is discussed. The result is correspondence with experimental results. In addition, because the TeO2 AOTF has a specific structure based on its design principal, it is shown whether the sidelobes on the diffractive efficiency curve appear is mainly decided by the bandwidth of the AOTF and the mismatching factors. For a definite device bandwidth, if the total momentum mismatch is lower than a definite value, the device has no sidelobe. Then, the feasibility of the TeO2 AOTF as an OADM in WDM system has superiority on signal crosstalk.
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Wei Liu, Wei Liu, Yu-nan Sun, Yu-nan Sun, Fang Cui, Fang Cui, Long Ban, Long Ban, "Analysis on the signal crosstalk of TeO2 acousto-optic tunable filters used in optical communication", Proc. SPIE 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 71571D (2 February 2009); doi: 10.1117/12.811346; https://doi.org/10.1117/12.811346

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