Numerical Modelling of a Distributed Acoustic Sensor Based on Ultra-Low Loss-Enhanced Backscattering Fibers

Masoudi, Ali; Snook, James; Brambilla, Gilberto

doi:10.3390/s21206869

Cited by 9 publications

(6 citation statements)

References 32 publications

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“…To delay the onset of stimulated Brillouin scattering (SBS) and reduce coherent Rayleigh noise (i.e. interference in the backscattered light originating from different parts of pulse) [13], [14] in the HNLF, the linewidths of the two pump sources were broadened through phase modulation. Two phase modulators (PMs) were utilized to independently modulate the phase of two pumps, driven by an 8 GSa/s, 2 15 − 1, pseudo-random binary bit sequence (PRBS), generated from an arbitrary waveform generator (AWG).…”

Section: A Experimental Setupmentioning

confidence: 99%

Reflectometric Measurements of Fibre-Based Four-Wave Mixing Systems

Liu,

Bottrill,

Masoudi

et al. 2024

J. Lightwave Technol.

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A convenient way of achieving polarizationinsensitive four-wave mixing in optical fibers is through the use of two orthogonally polarized pumps. However, the interplay between fiber birefringence and the four-wave mixing processes makes polarization insensitivity challenging to achieve. The strict control of the input pumps' states of polarization has been used to minimize polarization sensitivity. Nonetheless, a comprehensive analysis of the complex interplay between birefringence and four-wave mixing, both theoretically and experimentally, is still missing. Here, we adopt an optical time domain reflectometry technique to address this issue by measuring the Rayleigh back-scattered power of the phase-conjugated idler generated by a four-wave mixing process. A system with approximately 50 cm spatial resolution capable of measuring the onset of polarization dependency of orthogonal-pump four-wave mixing systems in the saturation regime is experimentally demonstrated. The obtained results are compared with a detailed fibre model, and close agreement is confirmed. This study will further the understanding of the polarization sensitivity of multi-wave mixing dynamics in optical fibers and support the design of optimized fiber-based parametric devices.

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Section: A Experimental Setupmentioning

confidence: 99%

Reflectometric Measurements of Fibre-Based Four-Wave Mixing Systems

Liu,

Bottrill,

Masoudi

et al. 2024

J. Lightwave Technol.

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“…In order to avoid phase fading while extracting the phase information from equation (1), a symmetric 3 × 3 coupler can be used at the output of the interferometer. The data from three arms of the 3 × 3 coupler can then be combined to yield 38 :…”

Section: Principlementioning

confidence: 99%

10-cm spatial resolution distributed acoustic sensor based on an ultra low-loss enhanced backscattering fiber

Masoudi¹,

Lee²,

Beresna³

et al. 2022

Opt. Continuum

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In this work, a distributed acoustic sensor (DAS) with 10 cm spatial resolution is demonstrated. Such a high resolution is achieved by employing an ultra low-loss enhanced backscattering (ULEB) fibre as a sensing element. A conventional DAS system is modified to interrogate the ULEB fibre comprised of 50 discrete reflectors with an average reflectance of −56 dB. The sensing arrangement exhibits a phase noise of 1.9 nε/ √ Hz over 1 km sensing range.

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“…( 1), a symmetric 3 × 3 coupler can be used at the output of the interferometer. The data from three arms of the 3 × 3 coupler can then be combined to yield [38]:…”

Section: Principlementioning

confidence: 99%