Noise models for both single-pulse and coded Brillouin optical time-domain analyzers (BOTDA) are established to quantify the actual signal-to-noise ratio (SNR) enhancement provided by pulse coding at any fiber position in operating condition. Simulation experimental results show that polarization noise spontaneous scattering (SpBS) signal beating could highly penalize performance of coded-BOTDA...

In this paper, Gaussian smoothing (GS), non-local means (NLM), and Quaternion Wavelet Transform (QWT) have been described in detail. Furthermore, a Brillouin optical time domain analysis (BOTDA) experimental system was built to verify the denoising algorithms. The principal analyses show that QWT algorithm is more efficient image method. results indicate GS can obtain highest signal-to-noise ra...

In this paper, we propose a novel coding for long range Brillouin Optical Time Analysis (BOTDA) distributed sensors based on a combination of time and frequency pulses, resulting in an additional coding gain of √2 with respect to traditional intensity-modulated codes. The generation of frequency-chirped pseudo-arbitrary pulses in return-to-zero (RZ) format with a Direct-Digital Synthesizer (DDS...

We propose and demonstrate generation of Brillouin dynamic grating (BDG) in a few-mode fiber (FMF) with a Gaussian pulse pump and a counterpropagating continuous wave pump in LP01 mode. Brillouin optical time-domain analysis (BOTDA) is achieved by launching a third Gaussian pulse probe in LP11 mode. With coherent detection and time-domain analysis on the backreflected probe signal, the modal bi...

Fast reconstruction of the whole Brillouin gain spectrum is experimentally demonstrated using sweep-free Brillouin optical time-domain analysis (SF-BOTDA). Strain variations with the frequencies up to 400 Hz are spectrally analyzed, achieving strain sensitivity of 1 microstrain per root Hz at a sampling rate of 5.5 kHz and a spatial resolution of 4m. The results favorably compare with fiber Bra...

We propose a novel method to measure the nonlinear parameter of an optical fiber by characterizing the evolution of self-phase modulation (SPM) based on Brillouin optical time-domain analysis (BOTDA). The nonlinear parameter of an optical fiber is measured to be 2.03 W-1km-1, which agrees well with previously reported result.

A new pump-seeded, short-cavity Brillouin ring laser source layout intended for sensing applications is showcased, showing increased high maximum output (1.5 mW), a strong linewidth narrowing effect (producing light with of 10 kHz) and limited relative intensity noise (RIN ~ −145 dB/Hz), providing an ultranarrow, highly stable BRL that can also be employed as pump-probe optical time-domain anal...

In this paper, we propose and experimentally demonstrate a scheme of deep learning enhanced long-range fast Brillouin optical time-domain analysis (BOTDA). The volumetric data from BOTDA is denoised demodulated by using video denoising network neural network, respectively. Benefitting the advanced algorithms, sensing range extended to 10 km successfully. experiment, vibration signal measured wi...