Calibration of In-Phase/Quadrature Amplitude and Phase Response Imbalance for Coherent Receiver

Ju, Cheng; Tao, Zhenning; Fan, Yangyang; Zhao, Ying; Chen, Hao; Su, Xiaofei; Hoshida, Takeshi

doi:10.1364/ofc.2017.w2a.55

Cited by 9 publications

(3 citation statements)

References 5 publications

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“…If there is a frequency offset, each tone splits into two tones after beating with the local laser at the receiver. Then, receiver IQ response and imbalance could be estimated based on receiver DSP [27]. By employing the unitary polarization change matrix, both transmitter and receiver polarization skews are simultaneously measured by analyzing the receiver adaptive equalizer coefficient [28].…”

Section: In-field Measurement Before Servicementioning

confidence: 99%

Characterization, Measurement and Specification of Device Imperfections in Optical Coherent Transceivers

Tao

Fan

et al. 2022

J. Lightwave Technol.

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Transceiver imperfections become the primary source of impairment as baud rate and modulation order grow in advanced optical coherent communications. Thus, transceiver imperfections, both linear and nonlinear, need to be appropriately characterized, measured, and specified. Treatments for linear imperfections are relatively mature. This study reviews the transceiver's linear imperfection modeling, characterization, and measurement technologies. In practical applications, in-field measurement using the transceiver and a few low speed additional devices is preferred. In the case of nonlinear imperfections, the situation is complex. One important task is to estimate the nonlinear system performance from the nonlinear characteristics of the devices. In this study, we attempt to establish a connection between them by examining different technologies. Although the orthogonal component has a good correlation with nonlinear system performance, its measurement is prohibitively complex. In the nonlinear noise to power ratio measurement, a certain frequency component of the input signal is notched, and the re-growth component at the notch frequency is measured at the nonlinear device output. The ratio between the re-growth component power and the output signal power is the noise to power ratio. While this method is easy to carry out, it does not correctly estimate nonlinear impairment in general. The reason for this is that the signal incurs different nonlinear responses in two conditions, i.e., with or without a notch. This method accurately estimates the nonlinear impairment in some special but useful cases, such as Gaussian input signals and nonlinear systems whose dominant nonlinear term is the even order term.

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Section: In-field Measurement Before Servicementioning

confidence: 99%

Characterization, Measurement and Specification of Device Imperfections in Optical Coherent Transceivers

Tao

Fan

et al. 2022

J. Lightwave Technol.

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“…However, the balanced photodetector mismatches, trans-impedance amplifier mismatches and imperfect optimal 90°mixers all may lead to Rx IQ amplitude and phase imbalance, while the asymmetry in the electrical paths of the two Tx/Rx IQ paths may lead to IQ skew. 4,5 Therefore, high-speed, high-order, high-efficiency modulation patterns shorten the symbol period and significantly reduce the Euclidean distance of the constellation, which makes the system more sensitive to IQ imbalance at the receiving end, especially the severe ISI caused by tight FTN filtering will lead to intractable IQ imbalance compensation problems as the compensation range and accuracy are significantly degraded.…”

Section: Introductionmentioning

confidence: 99%

Improved IQ imbalance compensation algorithm in faster-than-Nyquist coherent optical communication systems

Yang,

Zhao,

Cao

et al. 2023

Fourteenth International Conference on Information Optics and Photonics (CIOP 2023)

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“…Forum (OIF) [8] and modified beat frequency method with iteration for skew calibration [9]. Transmitter imbalance is more critical for transmission and some recent works have attempted for compensation and calibration, such as indirect learning architecture-based skew calibration method for back-to-back case [10], 2×2 real-valued equalizer for imbalance compensation and calibration [11], adaptive source separation method for gain and phase imbalance compensation [12], off-line skew self-calibration with integrated lowbandwidth photodetector in commercial IQ modulator [13], reconfigurable interference method for skew calibration [14], clock tone extraction based on genetic algorithm for skew calibration [15], and clustering algorithm based gain and phase imbalance estimation [16].…”

Section: Introductionmentioning

confidence: 99%

In-Service Blind Transceiver IQ Imbalance and Skew Monitoring in Long-Haul Non-Dispersion Managed Coherent Optical Systems

Liu

2019

IEEE Access

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Transceiver imbalance can rapidly degrade system performance, especially when high symbol rate, high modulation order and low roll-off pulse shape are used. Here, a widely linear transmission model is derived to analyze the interaction of transceiver IQ gain imbalance, IQ phase imbalance, skew and fiber link for long-haul transmission. In-service blind transceiver imbalance measurement method is designed to calibrate and monitor the transceiver status. Two 4 × 2 complex-valued equalizers operated at twice symbol rates are designed before and after carrier phase recovery (CPR) to compensate receiver and transmitter imbalances, where the transceiver imbalance could be derived from the taps of two converged equalizers. The impact of transceiver imbalance and fiber nonlinearity on the measurement accuracy are numerically evaluated based on a 42 GBaud 16-QAM system through 1500-km standard single fiber (SSMF) transmission.

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Calibration of In-Phase/Quadrature Amplitude and Phase Response Imbalance for Coherent Receiver

Cited by 9 publications

References 5 publications

Characterization, Measurement and Specification of Device Imperfections in Optical Coherent Transceivers

Characterization, Measurement and Specification of Device Imperfections in Optical Coherent Transceivers

Improved IQ imbalance compensation algorithm in faster-than-Nyquist coherent optical communication systems

In-Service Blind Transceiver IQ Imbalance and Skew Monitoring in Long-Haul Non-Dispersion Managed Coherent Optical Systems

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