Remote amplification in long range distributed Brillouin-based temperature sensors

Cho, Y. T.; Alahbabi, M.; Brambilla, Gilberto; Newson, T.P.

doi:10.1117/12.623432

Cited by 4 publications

(4 citation statements)

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“…Due to their relevance in sensing, works are in course to improve their main technical characteristics [25][26][27][28]. Despite the importance of this technology to solve real problems and in spite of the important flux of ideas coming from the research centers, their commercialization has not reach the expected level yet.…”

Section: 3-distributed Sensingmentioning

confidence: 99%

Fiber optics in structural health monitoring

et al. 2010

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Structural Health Monitoring (SHM) has assumed a significant role in assessing the structures safety and integrity. SHM can be understood as the integration of sensing intelligence and possibly also actuation devices to allow the structure loading and damaging conditions to be recorded, analyzed, localized and predicted in such a way that non-destructive testing becomes an integral part of the structure. SHM sensing requirements are very well suited for fiber optic sensing technology. So in this paper, after a very brief introduction of the basic SHM concepts, the main fiber optic technologies for this application will be reviewed, several examples and the main current technical challenges will be addressed and, finally, the conclusions summarized.

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Section: 3-distributed Sensingmentioning

confidence: 99%

Fiber optics in structural health monitoring

et al. 2010

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“…Two types of Brillouin-based DFS are used. The first is called a Brillouin optical time-domain reflectometry (BOTDR) [2][3][4][5][6][7][8]. In BOTDR, the optical pulse is launched into the fiber and spontaneous Brillouin scattering is gathered.…”

Section: Introductionmentioning

confidence: 99%

“…Soto et al use the optical pulse coding (OPC) technology to improve the SNR over a 50 km sensing distance [17][18][19]. Cho et al utilize Raman amplification to BOTDR to avoid the exponential attenuation for Brillouin pump power [8]. Recently, we generalized Raman amplification to BOTDA and investigated its sensing performance both theoretically and experimentally [20].…”

Section: Introductionmentioning

confidence: 99%

Theoretical investigations on the non-local effect in a long-distance Brillouin optical time-domain analyzer based on bi-directional Raman amplification

Jia¹,

Rao²,

Wang³

et al. 2012

J. Opt.

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The influence of the non-local effect on sensing performance in a long-distance Brillouin optical time-domain analyzer (BOTDA) based on bi-directional Raman amplification has been investigated theoretically. The system error induced by the non-local effect worsens with increased powers of probe wave and Raman pump. For smaller Brillouin pump power, the non-local effect is almost independent of Brillouin pump power. For larger Brillouin pump power, the non-local effect deteriorates gradually due to Raman gain saturation and cross-gain modulation (XGM). The purely backward pumping (relative to probe light) is preferable for non-local effect suppression. The frequency-division multiplexing (FDM) and time-division-multiplexing (TDM) technologies exhibit similar performance for suppressing the non-local effect under the same conditions. The sensing range near the far-end (relative to the Brillouin pump) should be appropriately shorter to minimize the non-local effect in FDM and TDM. The physical mechanisms of the non-local effect in long-distance BOTDA with Raman amplification are also shown.

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“…In the second scheme, Raman pump provides the Raman amplification for both the probing signal and backscattered signal. In addition, the remaining pump power is also used to remotely pump a piece of EDF located within the span link and hence provides secondary amplification [33][34][35].…”

Section: New Applications Of Fiber Raman Amplifiermentioning

confidence: 99%

Optimization and application of broadband fiber Raman amplifiers

Li¹

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I would like to thank many people for their help in completing this thesis, but my foremost and earnest appreciation goes to my supervisor, Associate Professor Lu Chao, for his professional guidance, invaluable assistance and kind encouragement throughout my graduate studies as well as his constructive comments on this thesis. I want to express my special thanks for Dr. Wen Yang Jing and Associate Professor Cheng Tee Hiang for their great help on my research work and good suggestion on my thesis and future career. I would also like to express my sincere appreciation to Associate Professor Ampalavanapillai Nirmalathas of

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Remote amplification in long range distributed Brillouin-based temperature sensors

Abstract: A remotely pumped EDFA combined with Raman amplification was used to enhance the performance of spontaneous Brillouin intensity-based temperature sensor. A temperature resolution of 5.7 C, spatial resolution of 20m was achieved at 88km.

Cited by 4 publications

References 1 publication

Fiber optics in structural health monitoring

Fiber optics in structural health monitoring

Theoretical investigations on the non-local effect in a long-distance Brillouin optical time-domain analyzer based on bi-directional Raman amplification

Optimization and application of broadband fiber Raman amplifiers

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