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A MMIC predistortion circuit that operates at up to 10 GHz and improves the spurious free dynamic range of a broadband analog fiber-optic link from 108 dB/Hz2/3 to 111 dB/Hz2/3 is developed. The experimental results agree with the performed theoretical analysis, indicating that the link dynamic range improvement through the predistortion technique is limited by the high driving voltage of a standard LiNbO3 Mach-Zehnder modulator, that is, by the third-order intercept point of commercial microwave broadband power amplifiers. To overcome this limitation a low-voltage modulator should be employed.
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Zhang et al. (1996) studied this question.
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