Simultaneous measurement of absorption and scattering losses in bulk glass and optical fibers by a microcalorimetric method

1974 ◽  
Vol 25 (6) ◽  
pp. 345-347 ◽  
Author(s):  
Alcibiade Zaganiaris
Keyword(s):  
Optical Fibers ◽  
Simultaneous Measurement ◽  
Bulk Glass ◽  
Microcalorimetric Method ◽  
Scattering Losses

Absorption losses and thermal diffusivity of optical fibers investigated by photothermal methods: theory and experiments

1983 ◽  
Vol 61 (9) ◽  
pp. 1334-1346 ◽  
Author(s):  
Dominique Chardon ◽  
Serge J. Huard
Keyword(s):  
Thermal Diffusivity ◽  
Absorption Coefficient ◽  
Optical Fibers ◽  
Rayleigh Scattering ◽  
Modulation Frequency ◽  
Threshold Value ◽  
Phase Delay ◽  
Algebraic Expression ◽  
Photothermal Methods ◽  
Scattering Losses

Both the absorption coefficient and the thermal diffusivity of an optical fiber have been measured using photothermal methods: photoacoustics (P.A.) and photothermal deflection (P.D.). The amplitude of the photothermal signal is proportional to the heat density generated in the fiber core. This in turn is proportional to the light absorption coefficient β. Thus, these techniques allow one to separate the absorption and Rayleigh scattering losses. The results obtained by the two methods are in agreement. A threshold value of 10 dB km−1 mW has been determined experimentally. In both cases, the device is calibrated by replacing the fiber with a heated electric wire. Moreover, the heat must diffuse from the core to the gas so that when the light is modulated, a phase delay appears. A study of phase delay versus modulation frequency gives the thermal diffusivity of the fiber. This is required in order to improve fiber sensors.Theoretically, the cylindrical geometry of the sample permits simple calculations. The thermoelastic equations in solids and coupled thermodynamic ones in the gas have been solved without neglecting viscosity effects. Noting that silica is almost unexpansible, an algebraic expression of the signal has been obtained without any assumptions on the gas transformation processes. Finally, the P.A. and P.D. techniques are compared and some extensions are presented.

Scattering Losses in Fluoride Optical Fibers

1991 ◽  
Vol 32-33 ◽  
pp. 495-500 ◽  
Author(s):  
Ishwar D. Aggarwal ◽  
Guo Xing Lu ◽  
Lynda E. Busse
Keyword(s):  
Optical Fibers ◽  
Scattering Losses

Characterization of scattering losses in tapered optical fibers perturbed by a microfiber tip

2020 ◽  
Vol 37 (5) ◽  
pp. 1401
Author(s):  
Pengfei Zhang ◽  
Xin Wang ◽  
Lijun Song ◽  
Chenxi Wang ◽  
Gang Li ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Scattering Losses

Numerical method for simultaneous measurement of dispersion and nonlinear coefficient in optical fibers

2012 ◽  
Vol 285 (6) ◽  
pp. 1461-1465 ◽  
Author(s):  
Duc Minh Nguyen ◽  
Sy Dat Le ◽  
Gildas Gueguen ◽  
David Méchin ◽  
Monique Thual ◽  
...  
Keyword(s):  
Numerical Method ◽  
Optical Fibers ◽  
Simultaneous Measurement ◽  
Nonlinear Coefficient

scholarly journals D-Shaped POF Sensors for Refractive Index Sensing—The Importance of Surface Roughness

Sensors ◽  
2019 ◽  
Vol 19 (11) ◽  
pp. 2476 ◽  
Author(s):  
Filipa Sequeira ◽  
Nunzio Cennamo ◽  
Alisa Rudnitskaya ◽  
Rogério Nogueira ◽  
Luigi Zeni ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Refractive Index ◽  
Optical Fibers ◽  
Low Cost ◽  
Water Quality Assessment ◽  
Refractive Index Sensing ◽  
Plastic Optical Fibers ◽  
Index Changes ◽  
Low Cost Manufacturing ◽  
Scattering Losses

In this study the influence of the surface roughness on the transmission capacities of D-shaped plastic optical fibers (POFs) and sensors performance was investigated. Five D-shaped POF sensors were produced and characterized for refractive index sensing between 1.33 and 1.41. The sensors were characterized using a low-cost optical sensing system based on the variation of the transmitted light though the POF with refractive index changes (RI). Higher surface roughness increases the scattering losses through the POF and influences the sensors’ performance; therefore, a balance must be attained. Generally, the best performance was achieved when the sensing region was polished with P600 sandpaper as a final polishing step. Polishing with sandpapers of lower grit size resulted in lower scattering, higher linearity of the sensor response and generally lower performance for RI sensing. A sensor resolution of 10−3–10−4 RIU, dependent on the value of the external refractive index, was obtained through simple and low-cost manufacturing procedures. The obtained results show the importance of surface roughness in the development of POF sensors which can be used in several applications, such as for water quality assessment.

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