Stable RF transmission in dynamic phase correction with Rayleigh backscattering noise suppression

Zhou, Shan; Liu, Chenxia; Chen, Xing; Jiang, Tianwei; Cong, Jinting; Gao, Hao; Luo, Bin; Yu, Song

doi:10.1016/j.yofte.2020.102165

Cited by 4 publications

(3 citation statements)

References 22 publications

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“…Therefore, it is necessary to compensate for the phase fluctuations to achieve stable RF transmission in optical fiber link. Currently, high-precision frequency synchronization schemes generally require bidirectional transmission of signals in the same fiber, where the phase fluctuations of the two propagation directions are highly correlated, therefore the phase fluctuations of the uplink can almost perfectly compensate for the phase fluctuations in the downlink [5], [6]. However, the above scheme is in conflict with the existing telecommunication networks, which are equipped with unidirectional amplifiers, and the optical signals can only be transmitted in one direction along the link.…”

Section: Introduction Large Number Of Advanced Scientific and Industr...mentioning

confidence: 99%

A CNN-LSTM Phase Compensation Method for Unidirectional Two-way Radio Frequency Transmission System

Cheng,

Wang,

Qiao

et al. 2024

IEEE Photonics J.

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A convolutional neural network combined with long short-term memory (CNN-LSTM) phase compensation method (PCM) is proposed and demonstrated, where CNN is employed to extract spatial features, and LSTM is used to capture temporal features and realize the long-term predictions of residual phase fluctuations. This is the first-time machine learning (ML) has been used to mitigate the effects of optical path asymmetry caused by temperature variations on radio frequency (RF) transmission systems. The performance is verified by experiments on a unidirectional two-way RF transmission system, in which both the two 259-km-long separate fibers are coupled into one optical cable. The results demonstrate the CNN-LSTM model presents better prediction performance than the other eight previously proposed ML models. When the prediction duration is 40,000 s and the ambient temperature variation range is 14.38°C, the coefficient of determination (R Squared, R 2 ) between the predicted value and the actual value is higher than 0.99. In addition, compared to the phase locked loop (PLL) PCM, the proposed CNN-LSTM PCM can reduce the root-mean-square (RMS) phase jitter of the received signal from 219 ps to 19.72 ps, and improve the frequency stability of the system at 10,000 s by 84.5%. Overall, the proposed CNN-LSTM PCM can effectively compensate for residual phase fluctuations generated by the optical path asymmetry, providing a potential option for achieving stable RF transmission in telecommunication networks.

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Section: Introduction Large Number Of Advanced Scientific and Industr...mentioning

confidence: 99%

A CNN-LSTM Phase Compensation Method for Unidirectional Two-way Radio Frequency Transmission System

Cheng,

Wang,

Qiao

et al. 2024

IEEE Photonics J.

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“…In recent years, the phase-stable transmission of microwave signals based on phase compensation has been proposed and widely discussed, which can be classified into the active and passive compensation. For the active compensation scheme, the phase jitter is eliminated usually by performing phase detection and compensation algorithms on the signals to correct and offset the phase jitter [6][7][8]. However, the processing bandwidth…”

Section: Introduction He High-precision Frequency Transmission Techniquementioning

confidence: 99%

“…At the same time, additional thermal noise will also be induced, deteriorating the frequency stability of the system. For example, phase shifter and phase-locked loop (PLL) based compensation methods have achieved a long-term frequency stability of 10 -17 at 10000 s averaging time for low-frequency RF only within 2.4 GHz [6,7]. The passive compensation scheme usually uses a mixer and a frequency multiplier to perform a conjugate inversion on the phase offset of the received signals, and the phase jitter is thus eliminated by transmitting it back to the remote end.…”

Section: Introduction He High-precision Frequency Transmission Techniquementioning

confidence: 99%

An All-Optical Ka-Band Microwave Long-Distance Dissemination System Based on an Optoelectronic Oscillator

Zhang

Xie

et al. 2022

IEEE Photonics J.

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We proposed an all-optical Ka-band microwave long-distance dissemination system based on an optoelectronic oscillator (OEO). In this system, a single tone with high spectrum purity and low phase noise is excited by an injection-locked OEO, and distributed to the remote site through the fiber loop of the OEO at the same time. The second harmonic of the reference signal modulates the round-tripping optical signal at the local site, which achieves the phase conjugator at the optical domain. At the remote end, the phase-conjugated signal is photomixed with the OEO signal to eliminated the phase offset. The proposed scheme improves the phase noise of the high frequency signal received at the remote site and reduces the photoelectric conversion loss. We demonstrated the transmissions of a 36 GHz frequencyquadrupled RF signal along a 6 km optical fiber loop, and the frequency stability is 1.069×10 -14 /1s and 3.3×10 -16 /1000s. The single-sideband (SSB) phase noise of the received signal at the remote site is up to -130 dBc/Hz at 10 kHz offset frequency.

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Photonic Phase-Stabled Transmission of Broadband Signals Based on Passive Compensation

Yang

Qiu

et al. 2023

IEEE Photon. Technol. Lett.

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Stable RF transmission in dynamic phase correction with Rayleigh backscattering noise suppression

Cited by 4 publications

References 22 publications

A CNN-LSTM Phase Compensation Method for Unidirectional Two-way Radio Frequency Transmission System

A CNN-LSTM Phase Compensation Method for Unidirectional Two-way Radio Frequency Transmission System

An All-Optical Ka-Band Microwave Long-Distance Dissemination System Based on an Optoelectronic Oscillator

Photonic Phase-Stabled Transmission of Broadband Signals Based on Passive Compensation

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