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Linearization of 1.3-/spl mu/m MQW electroabsorption modulators using an all-optical frequency-insensitive technique

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5 Author(s)
K. K. Loi ; Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA, USA ; J. H. Hodiak ; X. B. Mei ; C. W. Tu
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A novel all-optical linearization technique has been developed for discrete multiquantum-well electroabsorption modulators by exploiting the wavelength dependence of the quantum-confined Stark effect. The correcting signal for a particular order of nonlinearity is generated by the same modulator at a detuned optical wavelength, canceling the undesired order of nonlinear distortion via coherent RF recombination at the photodetector. This dual-wavelength approach is simple and insensitive to the microwave subcarrier frequency. A dramatic 30-dB reduction in the third-order nonlinear distortion at 10 GHz and 8-dB increase in the suboctave link dynamic range were achieved experimentally.

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IEEE Photonics Technology Letters  (Volume:10 ,  Issue: 7 )