We present an experimental study of light polarization on solid core microstructured optical fibers type (Large Mode
Area) LMA-16, LMA-20 and LMA-25. These fibers were partially filled with one micron diameter polyethylene spheres
or carbon nanotubes diluted in distilled H2O by capillarity. Polarization characterization was realized on these Photonic
Crystal fibers with air filled holes and partially particle filled holes using a He-Ne 633nm central wavelength laser at
10mW. The achieved results were compared using graphical data of every test collected at different exposition dates
where the fiber was exposed to particle sedimentation. Results depicted that short time sedimentation of these particles
does not change the light polarization leaving from the fiber except for the phase of the beam. On the other hand, longer
time particle exposition visibly changes the light phase measured at the end of the photonic crystal fiber with repeatable
results.
We propose a temperature sensor based on dispersion shifted long period fiber grating (LPFG) fabricated with the
fattening method, using electric arc discharges from a commercial fusion splicer machine. The fattened LPFG are
centered at 1524 and 1550 nm, respectively. A temperature characterization in terms of the transmitted spectrum is
realized with a pumped Er+3 doped fiber as the light source. The less than 3 mm in length fattened LPFG reached a
sensitivity of 72 pm/°C between a temperature range of (25-500°C). Temperature stability was observed among the
temperature range of (25-200°C), result in agreement with our previous studies. From up to 200°C sensing is observed
as temperature increases. To apply this LPFG as a temperature sensor, sensing was measured as voltage signal outputs
with repeatable results. This sensor is a high temperature resistant device because non deterioration of its properties was
observed, and can find useful applications when temperature stability may be needed or the sensing requirements are
desirable.
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