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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry Van Driel
  • Vol. 26, Iss. 6 — Jun. 1, 2009
  • pp: 1203–1208

Long-period fiber gratings fabricated by use of defocused C O 2 laser beam for polarization-dependent loss enhancement

Minwei Yang, Yuhua Li, and D. N. Wang  »View Author Affiliations


JOSA B, Vol. 26, Issue 6, pp. 1203-1208 (2009)
http://dx.doi.org/10.1364/JOSAB.26.001203


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Abstract

An alternative of the long-period fiber grating (LPFG) fabrication method has been developed in this work by use of defocused C O 2 laser 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 .

© 2009 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(060.2340) Fiber optics and optical communications : Fiber optics components
(230.5440) Optical devices : Polarization-selective devices
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Diffraction and Gratings

History
Original Manuscript: January 23, 2009
Revised Manuscript: March 17, 2009
Manuscript Accepted: April 8, 2009
Published: May 12, 2009

Citation
Minwei Yang, Yuhua Li, and D. N. Wang, "Long-period fiber gratings fabricated by use of defocused CO2 laser beam for polarization-dependent loss enhancement," J. Opt. Soc. Am. B 26, 1203-1208 (2009)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-26-6-1203

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