Low-complexity algorithms for coherent optical systems with transceiver IQ imbalance

Abstract

The next-generation coherent optical communication relies on higher symbol transmission rates with higher modulation cardinality. The imbalance between the in-phase (I) and the quadrature (Q) arms in such systems leads to deteriorated performance if not corrected. In this work, we propose a reference constellation adaptation-based single-tap, novel carrier phase recovery algorithm, tolerant to the transmitter IQ imbalance and a pilot-free geometric parameter extraction-based receiver IQ imbalance correction method for MQAM signals. The proposed scheme is numerically investigated through extensive simulations for 32 GBaud polarization multiplexed (PM)-16QAM, and 64QAM modulation formats and experimentally verified for 32 GBaud PM-16QAM signal. The proposed pilot-free scheme is applicable to any modulation format and offers lower computational complexity than traditional algorithms.

Advancements in Optical Communication Research: A Review of India's Progress

“…We have demonstrated Tbps data transmission using superchannel, few mode and multi-core fiber transmission in collaboration with Sterlite Technologies Ltd [30], [31]. Figure 4 shows the superchannel transmission with Figure 4 We have also demonstrated various DSP algorithms through post processing of experimental data in order to compensate for various impairments in coherent transmission such as widely linear filter for multi-impairment correction [32], carrier phase recovery tolerant to transmitter IQ imbalance [33], Geometric parameter extraction based method for receiver IQ imbalance correction [34], [35], Kalman filter based phase noise correction for OFDM signals [36].…”