Performance analysis of Kramers-Kronig receiver in the presence of IQ imbalance

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We investigate the impact of IQ imbalance of the transmitter on the performance of the direct-detection system utilizing the Kramers-Kronig receiver. We show through theoretical analysis that the amplitude imbalance, timing misalignment, and IQ phase mismatch create double-sideband distortions, which, in turn, serve to violate the minimum phase condition and also lead to the dispersion-induced RF power fading after transmission. The theoretical analysis is verified by using numerical simulations. The results show that the amplitude imbalance and timing misalignment should be less than 2 dB and 2 ps, respectively, when the receiver sensitivity penalty is smaller than 1 dB for the transmission of a 112-Gb/s 16-QAM OFDM signal.
Publisher
IEEE
Issue Date
2018-12
Language
English
Article Type
Article
Citation

IEEE Photonics Technology Letters, v.30, no.24, pp.2171 - 2174

ISSN
1041-1135
DOI
10.1109/LPT.2018.2879660
URI
http://hdl.handle.net/10203/248698
Appears in Collection
EE-Journal Papers(저널논문)
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