TY  - JOUR
T1  - Tunable Notch Fiber Bragg Grating Optical Filter
AU - Yhia, Aia T. AU - Mansour, Tahreer S. AU - Hammadi, Yousif I. 
JO  - Journal of Engineering and Applied Sciences
VL  - 13
IS  - 17
SP  - 7450
EP  - 7458
PY  - 2018
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2018.7450.7458
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2018.7450.7458
KW  - Fiber-optic sensors
KW  -Mach-Zehnder Interferometer (MZI)
KW  -Fiber Bragg Grating (FBG)
KW  -strain and
force measurements
KW  -Bragg wavelength
KW  -tensile
AB  - This study presents a continuously tunable optical notch filter based on homodyne Machzehnder
interferometer (Machzehnder using dual uniform fiber Bragg gratings) is proposed. The tunability of the filter
is achieved by wavelength tuning of the fiber Bragg gratings to adjust the basic time delay provided by a
dispersive element. Tunability of the filter can be generated by applying mechanical and physical effects which
are strain and force on the second arm of homodyne Mach-Zehnder interferometer, i.e., (effected arm). It has
been shown from the results that the FBG is very sensitive to variations in strain over a range of (0-0.31) and
the normalized sensitivity from 62.8758-62.8743, shifted Bragg wavelength from 1545.726-1545.764 nm, full width
at half maximum from 197.529-238.080 pm and power from 12.1-11 nW and in the theoretical optiwave, obtained
to the shifted Bragg wavelength from 1454.766-1546.25 nm. It observed that when tensile strain applied to the
second arm of homodyne MZI, showed shifting in center wavelength (red shift). Also, observed from the
results, the relation between the shifted Bragg wavelength and micro strain is nonlinear.
ER  -