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Integrated acoustooptic tunable filters using weighted coupling

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2 Author(s)
Kar-Roy, A. ; Dept. of Electr. & Comput. Eng., California Univ., Irvine, CA, USA ; Tsai, C.S.

A detailed theory and experimental results are presented on weighted-coupling integrated acoustooptic tunable filters (IAOTF). A low-sidelobe-level single-stage IAOTF in which the weighted coupling was facilitated by focused surface acoustic waves along an interaction length of 6.0 mm has been realized on a Y-X LiNbO3 substrate, 8 mm in length. The measured performances of this weighted-coupling IAOTF at the optical center wavelength of 1.31 μm include a peak mode conversion at the acoustic center frequency of 214.6 MHz, a wavelength tuning range of 110 nm, a -3 dB optical bandwidth of 4.1 nm, and a switching rise time of 0.965 μs. Sidelobe levels below -21.4 dB have been accomplished at the mode-conversion efficiency of 15 percent and an RF drive power of 160 mW

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Quantum Electronics, IEEE Journal of  (Volume:30 ,  Issue: 7 )