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Baseband integrated acousto-optic frequency shifter/modulator module for fiber optic at 1.3 mu m

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2 Author(s)
C. S. Tsai ; Dept. of Electr. & Comput. Eng., California Univ., Irvine, CA, USA ; Z. Y. Cheng

A baseband integrated acoustooptic (AO) frequency shifter/modulator module that consists of a pair of titanium-indiffused proton-exchanged (TIPE) waveguide lenses and a pair of cascaded guided-wave AO Bragg cells has been realized in a Y-cut LiNbO/sub 3/ waveguide substrate 0.1 cm*1.0 cm*2.0 cm in size. A device module operating at the optical wavelength of 1.3 mu m has provided a -3-dB tunable bandwidth of 120 MHz at baseband. The frequency-shifted or -modulated light propagates in a fixed direction, irrespective of the magnitude of frequency shift or modulation, and is focused into a spot (FWHM) of 6.2- mu m size on the output edge of the waveguide. Accordingly, this optical frequency shifter/module can be directly interfaced with single-mode optical fibers to facilitate applications in fiber optic systems.<>

Published in:

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control  (Volume:40 ,  Issue: 4 )