A balanced detection approach is proposed and demonstrated which can eliminate the single-octave constraint of performance enhancement schemes for externally modulated optical links, such as low-biasing and carrier filtering. Using our approach with low-biased modulators at 110 MHz we demonstrated a second harmonic reduction of 28 dB and a multi-octave SFDR improvement of 22 dB, to 108 dB/spl middot/Hz/sup 1/2/.
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Burns et al. (1996) studied this question.
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