scholarly journals Investigation on the Influence of Humidity on Stimulated Brillouin Backscattering in Perfluorinated Polymer Optical Fibers

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3952 ◽  
Author(s):  
Andy Schreier ◽  
Sascha Liehr ◽  
Aleksander Wosniok ◽  
Katerina Krebber
Keyword(s):  
Thermal Expansion ◽  
Optical Fibers ◽  
Strain Range ◽  
Spectral Transmission ◽  
Rayleigh Backscattering ◽  
Graded Index ◽  
Strain Coefficient ◽  
Polymer Optical Fibers ◽  
Stimulated Brillouin ◽  
First Time

In this paper perfluorinated graded-index polymer optical fibers are characterized with respect to the influence of relative humidity changes on spectral transmission absorption and Rayleigh backscattering. The hygroscopic and thermal expansion coefficient of the fiber are determined to be C H E = (7.4 ± 0.1) · 10 − 6 %r.h.−1 and C T E = (22.7 ± 0.3) · 10 − 6 K−1, respectively. The influence of humidity on the Brillouin backscattering power and linewidth are presented for the first time to our knowledge. The Brillouin backscattering power at a pump wavelength of 1319 nm is affected by temperature and humidity. The Brillouin linewidth is observed to be a function of temperature but not of humidity. The strain coefficient of the BFS is determined to be C S = (−146.5 ± 0.9) MHz/% for a wavelength of 1319 nm within a strain range from 0.1% to 1.5%. The obtained results demonstrate that the humidity-induced Brillouin frequency shift is predominantly caused by the swelling of the fiber over-cladding that leads to fiber straining.

Graded-Index and Single-Mode Polymer Optical Fibers

1992 ◽  
Vol 247 ◽  
Author(s):  
Yasuhiro Koike
Keyword(s):  
Mechanical Properties ◽  
Optical Fibers ◽  
Single Mode ◽  
Polymer Optical Fiber ◽  
Core Diameter ◽  
Graded Index ◽  
The Core ◽  
High Bandwidth ◽  
Polymer Optical Fibers ◽  
First Time

ABSTRACTHigh-bandwidth graded-index (GI) polymer optical fiber (POF) and single-mode POF with good mechanical properties were successfully obtained by our interfacial-gel polymerization technique. The bandwidth of the GI POF is about 1 GHz · km which is two hundred times larger than that of the conventional step-index (SI) POF. The minimum attenuation of transmission is 56 dB/km at 688-nm wavelength and 94 dB/km at 780-nm wavelength. The single-mode POF in which the core diameter was 3–15 μ m and the attenuation of transmission was 200 dB/km at 652-nm wavelength was successfully obtained for the first time.

scholarly journals Distributed Static and Dynamic Strain Measurements in Polymer Optical Fibers by Rayleigh Scattering

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5049
Author(s):  
Agnese Coscetta ◽  
Ester Catalano ◽  
Enis Cerri ◽  
Ricardo Oliveira ◽  
Lucia Bilro ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Time Domain ◽  
Rayleigh Scattering ◽  
Cost Effective ◽  
Time Domain Reflectometry ◽  
Dynamic Strain ◽  
Strain Measurements ◽  
Graded Index ◽  
Optical Time ◽  
Polymer Optical Fibers

We demonstrate the use of a graded-index perfluorinated optical fiber (GI-POF) for distributed static and dynamic strain measurements based on Rayleigh scattering. The system is based on an amplitude-based phase-sensitive Optical Time-Domain Reflectometry (ϕ-OTDR) configuration, operated at the unconventional wavelength of 850 nm. Static strain measurements have been carried out at a spatial resolution of 4 m and for a strain up to 3.5% by exploiting the increase of the backscatter Rayleigh coefficient consequent to the application of a tensile strain, while vibration/acoustic measurements have been demonstrated for a sampling frequency up to 833 Hz by exploiting the vibration-induced changes in the backscatter Rayleigh intensity time-domain traces arising from coherent interference within the pulse. The reported tests demonstrate that polymer optical fibers can be used for cost-effective multiparameter sensing.

scholarly journals Amplified spontaneous emission in graded-index polymer optical fibers: theory and experiment

2013 ◽  
Vol 21 (20) ◽  
pp. 24254 ◽  
Author(s):  
M. Asunción Illarramendi ◽  
Jon Arrue ◽  
Igor Ayesta ◽  
Felipe Jiménez ◽  
Joseba Zubia ◽  
...  
Keyword(s):  
Spontaneous Emission ◽  
Optical Fibers ◽  
Amplified Spontaneous Emission ◽  
Graded Index ◽  
Polymer Optical Fibers ◽  
Theory And Experiment

Power losses in deformed graded-index polymer optical fibers

2008 ◽  
Vol 47 (27) ◽  
pp. 4907 ◽  
Author(s):  
Li-Wen Chen ◽  
Hsun-Heng Tsai ◽  
Yi-Long Ke ◽  
Yung-Chuan Chen
Keyword(s):  
Optical Fibers ◽  
Power Losses ◽  
Graded Index ◽  
Polymer Optical Fibers

scholarly journals Refractive-Index Profile Reconstruction in Graded-Index Polymer Optical Fibers Using Raman Spectroscopy

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2251
Author(s):  
Mikel Azkune ◽  
Angel Ortega-Gomez ◽  
Igor Ayesta ◽  
Joseba Zubia
Keyword(s):  
Refractive Index ◽  
Optical Fibers ◽  
Refractive Index Profile ◽  
Graded Index ◽  
Azimuthal Symmetry ◽  
Novel Method ◽  
Molecular Information ◽  
Polymer Optical Fibers ◽  
Profile Reconstruction ◽  
Fiber Characterization

This work reports a novel method to create a 3D map of the refractive index of different graded-index polymer optical fibers (GI-POF), measuring the Raman spectra at different points of their transverse sections. Raman fingerprints provide accurate molecular information of the sample with high spatial resolution. The refractive index of GI-POFs is modified by adding a dopant in the preform; therefore, by recording the intensities of the Raman peaks related to the dopant material, a 3D map of the refractive index is rendered. In order to demonstrate the usefulness of the method, three different GI-POFs were characterized and the obtained results were compared with the information provided by the manufacturers. The results show accurate 3D maps of the refractive index taken in the actual GI-POF end faces, showing different imperfections that manufacturers do not take into account, such as the slight deviations of the azimuthal symmetry. The simplicity and the feasibility of the technique mean this method has high potential for fiber characterization purposes.

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