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Title: Long-period fiber gratings fabricated by use of defocused CO₂laser beam for polarization-dependent loss enhancement
Authors: Yang, M
Li, Y
Wang, D 
Issue Date: 1-Jun-2009
Source: Journal of the Optical Society of America B : optical physics, 1 June 2009, v. 26, no. 6, p. 1203-1208
Abstract: An alternative of the long-period fiber grating (LPFG) fabrication method has been developed in this work by use of defocused CO₂laser pulse scanning, which is achieved by moving the laser beam focus plane slightly away from the fiber cladding surface. By increasing the distance shift from the cladding surface, the area with refractive index change also increases on the side with laser irradiation, which leads to an apparent mode field profile distortion at the resonant wavelength of the LPFG. Such a distortion in the mode field profile significantly increases the polarization-dependent loss of the LPFG. Moreover, for the cascaded LPFGs fabricated by use of this technique, the maximum polarization-dependent loss obtained can be largely increased from 7 to 17.8 dB, with a maximum dip in the wavelength change of 0.45 nm.
Keywords: Cladding surfaces
Fabrication method
Fiber claddings
Laser irradiations
Long period fiber grating
Mode fields
Polarization dependent loss
Refractive index changes
Resonant wavelengths
Wavelength change
Publisher: Optical Society of America
Journal: Journal of the Optical Society of America B : optical physics 
ISSN: 0740-3224
EISSN: 1520-8540
DOI: 10.1364/JOSAB.26.001203
Rights: © 2009 Optical Society of America. This paper was published in Journal of the Optical Society of America B and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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