TITLE:
Power Tapping Function in Near Infra-Red Region Based on 45° Tilted Fiber Gratings
AUTHORS:
Adedotun Adebayo, Zhijun Yan, Kaiming Zhou, Lin Zhang, Hongyan Fu, David Robinson
KEYWORDS:
Power Tapping; Tilted Fiber Grating; Polarization Dependent Loss; In-Fiber Polarizer
JOURNAL NAME:
Optics and Photonics Journal,
Vol.3 No.2,
June
5,
2013
ABSTRACT: We report an efficient power tapping device working in
near infra-red (800 nm) wavelength region based on UV-in- scribed
45° tilted fiber grating (45°-TFG) structure. Five 45°-TFGs were UV-inscribed in
hydrogenated PS750 fiber using a custom-designed phase mask with different
grating lengths of 3 mm, 5 mm, 9 mm,
12 mm
and 15 mm, showing polarization dependent losses (PDLs)
of 1 dB, 3 dB, 7 dB, 10 dB and 13 dB, respectively. The power side-tapping efficiency is
clearly depending on the grating strength. It has been identified that the
power tapping efficiency increases with the grating strength and deceases along
the grating length. The side-tapped power profile has also been examined in azimuthal
direction, showing a near-Gaussian distribution. These experimental results
clearly demonstrated that 45°- TFGs may be used as in-fiber power tapping
devices for applications requiring in-line signal monitoring.