scholarly journals Brillouin gain spectrum dependence on large strain in perfluorinated graded-index polymer optical fiber

2012 ◽  
Vol 20 (19) ◽  
pp. 21101 ◽  
Author(s):  
Neisei Hayashi ◽  
Yosuke Mizuno ◽  
Kentaro Nakamura
Keyword(s):  
Optical Fiber ◽  
Large Strain ◽  
Gain Spectrum ◽  
Polymer Optical Fiber ◽  
Graded Index ◽  
Brillouin Gain

Observation of Brillouin gain spectrum in tapered polymer optical fiber

2014 ◽  
Vol 115 (17) ◽  
pp. 173108 ◽  
Author(s):  
Neisei Hayashi ◽  
Hideyuki Fukuda ◽  
Yosuke Mizuno ◽  
Kentaro Nakamura
Keyword(s):  
Optical Fiber ◽  
Gain Spectrum ◽  
Polymer Optical Fiber ◽  
Brillouin Gain

scholarly journals Measurement Improvement of Distributed Optical Fiber Sensor via Lorenz Local Single Peak Fitting Algorithm

Symmetry ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1166
Author(s):  
Bin Liu ◽  
Jianping He ◽  
Shihai Zhang ◽  
Yinping Zhang ◽  
Jianan Yu ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Frequency Shift ◽  
Optical Fiber Sensor ◽  
Gain Spectrum ◽  
Fiber Sensor ◽  
Peak Fitting ◽  
Fitting Algorithm ◽  
Distributed Optical Fiber Sensor ◽  
Brillouin Gain ◽  
Distributed Optical Fiber

Brillouin frequency shift (BFS) of distributed optical fiber sensor is extracted from the Brillouin gain spectrum (BGS), which is often characterized by Lorenz type. However, in the case of complex stress and optical fiber self damage, the BGS will deviate from Lorenz type and be asymmetric, which leads to the extraction error of BFS. In order to enhance the extraction accuracy of BFS, the Lorenz local single peak fitting algorithm was developed to fit the Brillouin gain spectrum curve, which can make the BSG symmetrical with respect to the Brillouin center frequency shift. One temperature test of a fiber-reinforced polymer (FRP) packaged sensor whose BSG curve is asymmetric was conducted to verify the idea. The results show that the local region curve of BSG processed by the developed algorithm has good symmetry, and the temperature measurement accuracy obtained by the developed algorithm is higher than that directly measured by demodulation equipment. Comparison with the reference temperature, the relative measurement error measured by the developed algorithm and BOTDA are within 4% and 8%, respectively.

Analysis of graded-index polymer optical fiber link performance under fiber bending

2005 ◽  
Vol 23 (6) ◽  
pp. 2062-2072 ◽  
Author(s):  
K. Makino ◽  
T. Nakamura ◽  
T. Ishigure ◽  
Y. Koike
Keyword(s):  
Optical Fiber ◽  
Polymer Optical Fiber ◽  
Graded Index ◽  
Link Performance ◽  
Fiber Link

scholarly journals Fast Measurement of Brillouin Frequency Shift in Optical Fiber Based on a Novel Feedforward Neural Network

Photonics ◽  
2021 ◽  
Vol 8 (11) ◽  
pp. 474
Author(s):  
Fen Xiao ◽  
Mingxing Lv ◽  
Xinwan Li
Keyword(s):  
Neural Network ◽  
Optical Fiber ◽  
Frequency Shift ◽  
Brillouin Scattering ◽  
Principal Component ◽  
Feedforward Neural Network ◽  
Gain Spectrum ◽  
Fiber Sensors ◽  
Brillouin Gain ◽  
Distributed Optical Fiber

Brillouin scattering-based distributed optical fiber sensors have been successfully employed in various applications in recent decades, because of benefits such as small size, light weight, electromagnetic immunity, and continuous monitoring of temperature and strain. However, the data processing requirements for the Brillouin Gain Spectrum (BGS) restrict further improvement of monitoring performance and limit the application of real-time measurements. Studies using Feedforward Neural Network (FNN) to measure Brillouin Frequency Shift (BFS) have been performed in recent years to validate the possibility of improving measurement performance. In this work, a novel FNN that is 3 times faster than previous FNNs is proposed to improve BFS measurement performance. More specifically, after the original Brillouin Gain Spectrum (BGS) is preprocessed by Principal Component Analysis (PCA), the data are fed into the Feedforward Neural Network (FNN) to predict BFS.

scholarly journals Reconfigurable optical multiplexer based on liquid crystals for polymer optical fiber networks

2006 ◽  
Vol 14 (4) ◽  
Author(s):  
P. Lallana ◽  
C. Vázquez ◽  
J. Pena ◽  
R. Vergaz
Keyword(s):  
Optical Fiber ◽  
Wavelength Division Multiplexing ◽  
Optical Sensors ◽  
Integrated Circuit ◽  
Electronic System ◽  
Polymer Optical Fiber ◽  
Fiber Network ◽  
Fiber Networks ◽  
Graded Index ◽  
Optical Fiber Networks

AbstractIn this work, different novel 3×1 multiplexer structures for being used in polymer optical fiber networks are proposed. Designs are compact, scalable, and of low consumption, capable of operating in a large wavelength range simultaneously 660, 850, and 1300 nm, due to the use of nematic liquid crystal cells. Light that comes from each input port is handled independently and eight operation modes are possible.Control electronics has been made using a programmable integrated circuit. Electronic system makes available the managing of the optical stage using a computer. An additional four optical sensors have been included for allowing the optical status checking.Finally, a polarization independent multiplexer has been implemented and tested. Insertion losses less than 4 dB and isolation better than 23 dB have been measured. In addition, 30-ms and 15-ms setup and rise times have been obtained. The proposed multiplexer can be used in any polymer optical fiber network, even in perfluorinated graded index one, and it can be specially useful in optical sensor networks, or in coarse wavelength division multiplexing networks.

Twist dependencies of strain and temperature sensitivities of perfluorinated graded-index polymer optical fiber Bragg gratings

2019 ◽  
Vol 12 (8) ◽  
pp. 082007
Author(s):  
Yosuke Mizuno ◽  
Tianyi Ma ◽  
Ryo Ishikawa ◽  
Heeyoung Lee ◽  
Antreas Theodosiou ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Polymer Optical Fiber ◽  
Graded Index

Beyond the bandwidth-length product: Graded index microstructured polymer optical fiber

2007 ◽  
Vol 91 (19) ◽  
pp. 191119 ◽  
Author(s):  
R. Lwin ◽  
G. Barton ◽  
L. Harvey ◽  
J. Harvey ◽  
D. Hirst ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Polymer Optical Fiber ◽  
Graded Index
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