Phase noise reduction by using dual-frequency laser in coherent detection

Zhang, Zheng; Zhao, Changming; Zhang, Haiyang; Yang, Suhui; Dehua, Zhang; Yang, Hongzhi; Liu, Jiawei

doi:10.1016/j.optlastec.2016.01.005

Cited by 18 publications

(10 citation statements)

References 14 publications

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“…where G and R are, respectively, the gain and responsivity of the detector, P SpB (t) and P Rf are the power of the spontaneous Brillouin backscattering and the reference light, respectively, f B is the BFS, and ∆ϕ is the phase difference. Because the coherent detection is highly phase sensitive, the phase fluctuation caused by ∆ϕ will greatly decrease the SNR and even lead to the central frequency jitter [25]. It has been proven that the phase fluctuation in the coherent detection can be viewed as a nonstationary random process and follows normal distribution with the mean value of µ and the variance of σ 2 , given by Equation (9) [29]:…”

Section: Numerical Simulationmentioning

confidence: 99%

“…Because the coherent detection is highly phase sensitive, the phase fluctuation caused by Δφ will greatly decrease the SNR and even lead to the central frequency jitter [25]. It has been proven that the phase fluctuation in the coherent detection can be viewed as a nonstationary random process and follows normal distribution with the mean value of µ and the variance of σ 2 , given by Equation 9[29]:…”

Section: Numerical Simulationmentioning

confidence: 99%

“…Meanwhile, it has been proven that the BFS accuracy is determined not only by the width of BGS, but also by the SNR of the BOTDR system [24]. The system SNR of BOTDR is inherently related with the laser linewidth closely, because the coherent heterodyne detection, which is sensitive to the laser linewidth, is commonly used in BOTDR [25]. Hence, the influence of the laser linewidth on the BFS accuracy of BOTDR needs to be further discussed in detail, considering both the BGS width and the system SNR.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Laser Linewidth on the Brillouin Shift Frequency Accuracy of BOTDR

et al. 2018

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This paper analyzes the influence of laser linewidth on the measurement accuracy of a frequency-scanning Brillouin optical time domain reflectometer (FS-BOTDR), allowing for both the width of Brillouin gain spectrum and the signal-to-noise ratio (SNR) of the BOTDR system. The measurement accuracy of the Brillouin frequency shift (BFS) is theoretically investigated versus the duration of the probe pulse and the linewidth of the laser source, by numerically simulating how a FS-BOTDR works and evaluating the Brillouin gain spectrum (BGS) width and the system SNR. The simulation results show that the BFS accuracy is improved as the laser linewidth becomes narrower when the probe pulse width is fixed. We utilize five types of lasers with respective linewidths of 1.05 MHz, 101 kHz, 10.2 kHz, 3.1 kHz, and 98 Hz to compare the BFS measurement accuracy over a ~10 km optical sensing fiber. The experimental results demonstrate that the root-mean-square error (RMSE) of BFS decreases with the laser linewidth narrowing from 1.05 MHz to 3.1 kHz, which is in good agreement with the numerical simulation. However, the RMSE of BFS increases when the laser linewidth is less than 3.1 kHz, which may arise from the coherent Rayleigh noise due to a too narrow laser linewidth. The results can provide a theoretical basis and experimental guidance for choosing the appropriate laser linewidth in BOTDR.

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Section: Numerical Simulationmentioning

confidence: 99%

Section: Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Influence of Laser Linewidth on the Brillouin Shift Frequency Accuracy of BOTDR

et al. 2018

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“…Zheng et al introduced the advantage of the DF laser in reducing speckle noise and demonstrated the resistance against atmospheric influence. 10 They also showed that the optical heterodyne can greatly increase the SNR of the backscattered signal and improve the detection sensitivity. Cheng et al proved that the speed resolution of the signal-frequency (SF) laser Doppler velocimeter (LDV) gradually decreased while the DF-LDV was almost unaffected even better than the SF-LDV under both of the circumstances under controlled variable condition, the target distance was increased, or the speed was increased.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the beat frequency of DF laser is usually in MHz‐GHz magnitude, on the one hand, it reduces the bandwidth requirements of the detector, on the other hand, signal processing methods of microwave radar can be applied to DF lidar. Zheng et al introduced the advantage of the DF laser in reducing speckle noise and demonstrated the resistance against atmospheric influence 10 . They also showed that the optical heterodyne can greatly increase the SNR of the backscattered signal and improve the detection sensitivity.…”

Section: Introductionmentioning

confidence: 99%

A dual‐frequency continuous wave doppler lidar for velocity measurement at far distance

Xing

Gao

et al. 2021

Micro & Optical Tech Letters

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A dual-frequency continuous wave Doppler lidar for long-distance and high-precision velocity measurement is experimentally demonstrated in this article. The lidar system uses the optical heterodyne detection method to avoid complicated optical coherent configuration. All Phase Fast Fourier Transform and Chirp-Z Transform are used to obtain the Doppler frequency shift. The maximum of the calculated Doppler shift was 999.83 Hz with the frequency resolution of 0.54 Hz, and the corresponding theoretical velocity was determined to be 749.87 m/s. During the experiment, the speed of the car was successfully measured in the outdoor environment, the frequency and velocity resolutions were less than 0.5 Hz and AE 0.2 m/s, respectively, and the detection distance of moving and stationary targets reached 1100 m and 2300 m. The capability of the dual-frequency Doppler lidar system has been verified.

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Dual-frequency light source with widely tunable frequency difference based on single-side-band modulator

Jiang

Wang

Xie

et al. 2019

Optics Communications

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Phase noise reduction by using dual-frequency laser in coherent detection

Cited by 18 publications

References 14 publications

The Influence of Laser Linewidth on the Brillouin Shift Frequency Accuracy of BOTDR

The Influence of Laser Linewidth on the Brillouin Shift Frequency Accuracy of BOTDR

A dual‐frequency continuous wave doppler lidar for velocity measurement at far distance

Dual-frequency light source with widely tunable frequency difference based on single-side-band modulator

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