Equalization based inter symbol interference mitigation for time-interleaved photonic analog-to-digital converters
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Abstract:
We present an equalization based inter symbol interference (ISI) mitigation equalization method for time-interleaved photonic analog-to-digital converters (TIPADCs) by modelling the photodetection as a pulse shaper. A zero-forcing equalizer is designed and applied in a single-channel TIPADC system. The periodic ripples in equivalent channel frequency responses under three different photodetection bandwidths are suppressed from ∼2 dB, ∼5 dB, ∼10 dB to ∼0.5 dB, ∼0.5 dB, ∼1 dB, respectively, by the designed equalizer. The TIPADC after equalization has a bandwidth of 15 GHz, mainly limited by MZM. The ability for wideband signal distortion suppression of the proposed method is demonstrated by sampling an equal-power two-tone signal. The output power difference induced by ISI between two tones can be suppressed from ∼10.9 dB to ∼1.3 dB after equalization.
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