High-Performance Optical Frequency-Domain Reflectometry Based on High-Order Optical Phase-Locking-Assisted Chirp Optimization

Feng, Yuxiang; Xie, Weilin; Meng, Yinxia; Zhang, Ling; Liu, Zhangweiyi; Wei, Wei; Dong, Yi

doi:10.1109/jlt.2020.3011199

Cited by 22 publications

(3 citation statements)

References 30 publications

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“…It converges with the reference signal from the other arm with an AOFS3 induced 40 MHz frequency shift before feeding into BPD2. In order to avoid the impairment in spatial resolution due to the environmental disturbances along the FUT [24], the FUT is placed in soundproof box-2. At the same time, a short-delayed UMZI-2 with a 2 km fiber delay, corresponding to = 10 μs, and a 90° optical hybrid are used for dynamic laser frequency noise assessment.…”

Section: Operation Principlementioning

confidence: 99%

“…Conversely, the inherit frequency modulation response for commercial fiber lasers acts as a main limiting factor on loop bandwidth, hampering the further suppression of the residual phase error. This way, closing the gaps between locking mechanisms and loop delay would allow to take a full advantage of the high coherence for commercial fiber lasers [23], [24].…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Range Enhanced Optical Frequency Domain Reflectometry Using Dual-Loop Composite Optical Phase-Locking

et al. 2021

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We report on a dynamic range enhanced optical frequency domain reflectometry distributed backscattering interrogator based on dual-loop composite optical phase-locked loop (OPLL). Exploiting simultaneously an acousto-optic frequency shifter based an external modulation loop and a piezo based direct modulation loop, the proposed composite OPLL allows offering a larger loop bandwidth and gain, permitting a more efficient coherence enhancement as well as sweep linearization. A high fidelity frequency sweep of ~8.2 GHz at 164 GHz/s sweep rate is generated with a peak-to-peak frequency error as low as ~120 kHz. It leads to a dynamic range enhancement of more than 3 dB for the measured power loss compared to the case when only piezo loop is applied. This corresponds to ~15 km extension for the measurement range of Rayleigh backscattering without any spatial resolution penalties. Fourier transform-limited spatial resolution has been demonstrated at a range window more than about 28 times of the intrinsic coherence length of the adopted fiber laser. The proposed method provides a straightforward optimization of the real-time sweep control and is expected to be a useful tool in industrial and commercial applications.

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Section: Operation Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Range Enhanced Optical Frequency Domain Reflectometry Using Dual-Loop Composite Optical Phase-Locking

et al. 2021

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“…Currently, the research on the frequency-swept linearization can be roughly divided into two main approaches: the active control [6][7][8] and the passive control [9][10][11][12][13]. The active control approach is represented by the closed-loop correction approach.…”

Section: Introductionmentioning

confidence: 99%

High-Linear Frequency-Swept Lasers with Data-Driven Control

Zhao,

Xu,

et al. 2023

Photonics

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The frequency-swept laser (FSL) is applied widely in various sensing systems in the scientific and industrial fields, especially in the light detection and ranging (Lidar) area. However, the inherent nonlinearity limits its performance in application systems, especially in the broadband frequency-swept condition. In this work, from the perspective of data-driven control, we adopt the reinforcement learning-based broadband frequency-swept linearization method (RL-FSL) to optimize the control policy and generate the modulation signals. The nonlinearity measurement system and the system simulator are established. Since the powerful learning ability of the reinforcement learning algorithm, the linearization policy is optimized off-line and the generated modulation signals reduce the nonlinearity almost 20 times, compared to the case without control. In the long-term operation, the regular updated modulation signals perform better than the traditional iteration results, demonstrating the efficiency of the proposed data-driven control method in application systems. Therefore, the RL-FSL method has the potential to be the candidate of optical system control.

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Frequency Modulated Continuous WAVE Linearization of LiDAR Using Reinforcement Learning

Zhao

Yuan

Zhou³

et al. 2022

2022 Asia Communications and Photonics Conference (ACP)

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High-Performance Optical Frequency-Domain Reflectometry Based on High-Order Optical Phase-Locking-Assisted Chirp Optimization

Cited by 22 publications

References 30 publications

Dynamic Range Enhanced Optical Frequency Domain Reflectometry Using Dual-Loop Composite Optical Phase-Locking

Dynamic Range Enhanced Optical Frequency Domain Reflectometry Using Dual-Loop Composite Optical Phase-Locking

High-Linear Frequency-Swept Lasers with Data-Driven Control

Frequency Modulated Continuous WAVE Linearization of LiDAR Using Reinforcement Learning

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