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http://hdl.handle.net/10397/4516
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: http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-26-6-1203. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law. |
Appears in Collections: | Journal/Magazine Article |
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