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Laser Optics & Photonics and Atomic & Plasma Science 2018
J u l y 1 6 - 1 7 , 2 0 1 8
P r a g u e , C z e c h R e p u b l i c
Page 67
American Journal of Computer Science and Information Technology
ISSN: 2349-3917
E u r o S c i C o n J o i n t E v e n t o n
Laser Optics & Photonics and
Atomic & Plasma Science
Shien-Kuei Liaw et al., Am J Compt Sci Inform Technol 2018, Volume 6
DOI: 10.21767/2349-3917-C1-003
T
he aim of this paper is to improve a distributed fiber sensing system
based on Stimulated Brillouin Scattering (SBS) effect. In the experiment,
we introduced the measuring principle of distributed fiber sensing system
and defined the importance of parameters. While the spatial resolution was
affected by the reference frequency and the sideband component suppressed
in the probe. Among choosing the reference frequency from 0.125 MHz to 5
MHz, we found that the accurate data could be obtained when the reference
frequency was set at 0.125 MHz. In the original experimental setup, the Fiber
Fabry-Perot (FFP) tunable filter was used before the lock-in amplifier (LIA)
in order to prevent the power from getting too high. We also adjusted the
sensitivity of the lock-in amplifier so we could read the data correctly without
FFP-tunable filter and optimize the input signal quality. Afterward, we replace
the new DFB-LD with better output power and narrower line width because it
was useful for single side band modulation. Moreover, by replacing the signal
generator, the operation time on the frequency sweep would be faster; while
the speed increased more than two times from 11.66 points/min to 24.07
points/min. As for the modulation amplitude, it was selected from the original
100 mV unit as small as 1 mV so the modulation depth of the selection could
be more accurate. Finally, we successfully achieved the measurement range to
313 m with 3 m spatial resolution.
Biography
Shien-Kuei Liaw received double Doctorate degrees from
National Chiao-Tung University in photonics engineering and
from National Taiwan University in mechanical engineering,
respectively. He joined the National Taiwan University of
Science and Technology (NTUST) in 2000. He has been the
Director of both the optoelectronics research center and the
technology transfer center there. He was a visiting researcher
at Bellcore (now Telcordia), USA in 1996 for six months and a
visiting professor at University of Oxford, UK for three months
in 2011. He has forty U S/Taiwan patents and more than 250
journal articles and international conference presentations.
He has been actively contributing for many conferences as
technical program chair, international advisory committee and/
or keynote speaker. Currently, he is a distinguished Professor
at National Taiwan University of Science and Technology,
President of the Optical Society (OSA) in Taiwan chapter and
the Secretary-General of the Taiwan Photonic Society.
peterskliaw@gmail.comPerformance improvement of stimulated Brillouin scattering
distributed for fibre sensing system
Shien-Kuei Liaw
1
, Yu-Cheng Chou
1
, Chow-Shing Shin
1
, Yu-Lin
Shen
2
and Chi-Wen Liao
3
1
National Taiwan University, Taiwan
2
Institute of Labor, Occupational Safety and Health, Ministry of Labor, Taiwan
3
Green Energy and Environment Research Laboratories, ITRI, Taiwan