Simultaneously Precise Calibration of Frequency Response and IQ Skew for 100Gbaud Optical Transceiver

Li, Di; Chen, Zexin; Zhang, Li; Yi, Pin; Wang, Jingchuan; Song, Haiping; Cheng, Mengfan; Fu, Songnian; Tang, Ming; Qin, Yuwen; Liu, Deming; Deng, Lei

doi:10.1364/ofc.2021.th5d.1

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…Another candidate is the combination of a static filter and IQ-impairment-characteristic measurement techniques. Several techniques have been proposed for characterizing IQ impairments such as using multi-tone signals [12], phase retrieval [13], concatenated AEQs [14][15][16], Gram-Schmidt orthogonalization [17], and k-means clustering [18].…”

Section: Introductionmentioning

confidence: 99%

Digital Four-Dimensional Transceiver IQ Characterization

Kawai

Nakamura

Kobayashi

et al. 2023

J. Lightwave Technol.

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Signal impairments caused by the relative characteristic differences and crosstalk between electrical inphase (I) lanes and quadrature (Q) lanes are some of the main obstacles to the development of 100-Gbaud-class high-symbol-rate transceivers. To address such IQ impairments, we propose a method for enabling fully frequency-resolved four-dimensional (4D) characterization of IQ impairments even in the presence of arbitrary crosstalk across four IQ lanes of polarizationmultiplexed transceivers. We formulated a 4D signal-propagation model that takes into account inter-polarization IQ crosstalk and found how to separate the 4D IQ characteristics of the transmitter and receiver from the coefficients of a single-layer complex 8×2 multiple-input multiple-output adaptive equalizer on the basis of the model. We also introduce an application of the method for characterizing typical IQ impairments (e.g., IQ skew, IQ amplitude imbalance, phase deviation) from the filter coefficients. We numerically and experimentally tested our method with 96-Gbaud 16QAM signals and demonstrated its feasibility.

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