IQ Skew and Imbalance Estimation for Coherent Point-to-Multi-Point Optical Networks
CoRR(2024)
摘要
Coherent point-to-multi-point (PtMP) optical network based on digital
subcarrier multiplexing (DSCM) has been a promising technology for metro and
access networks to achieve cost savings, low latency, and high flexibility.
In-phase and quadrature (IQ) impairments of the coherent transceiver (e.g. IQ
skew and power imbalance) cause severe performance degradation. In the
DSCM-based coherent PtMP optical networks, it is hard to realize far-end
IQ-impairments estimation for the hub transmitter because the leaf on one
subcarrier cannot acquire the signal on the symmetrical subcarrier. In this
paper, we propose a far-end IQ-impairments estimation based on the specially
designed time-and-frequency interleaving tones (TFITs), which can
simultaneously estimate IQ skews and power imbalances of the hub transmitter
and leaf receiver at an individual leaf. The feasibility of the TFITs-based
IQ-impairments estimation has been experimentally verified by setting up
8Gbaud/SC×4SCs DSCM-based coherent PtMP optical network. The
experimental results depict that the absolute errors in the estimated IQ skew
and power imbalance are within ± 0.5ps and ± 0.2dB, respectively. In
conclusion, TFITs-based IQ-impairments estimation has great potential for
DSCM-based coherent PtMP optical networks.
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关键词
Coherent PtMP optical networks,DSCM,IQ-impairments estimation,IQ skew,and power imbalance
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