UV inscribed long period gratings with femtosecond ablated axial fibre slots for polarization control

Edward Davies*, Kyriacos Kalli, Charalambos Koutsides, Thomas D.P. Allsop, Lin Zhang

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference publication

Abstract

We present data on the development a new type of optical fibre polariser and the characterisation of its wavelength properties. The device is fashioned using a two step process. Firstly, a standard UV long period grating (LPG) with a period of 330μm is inscribed into hydrogenated SMF-28, followed by femtosecond laser ablation of a groove parallel to the fibre axis. The UV inscribed LPGs have inherently low birefringence. However, the removal of the cladding layer parallel to the location of the LPG within the fibre core (as a result the ablation) modifies the cladding modes that couple with the LPG. Furthermore, the groove breaks the fibre symmetry introducing a non-uniform stress profile across the fibre cross section leading to significant birefringence. We show that increasing the depth of the groove increases the birefringence, and this behaviour coupled with the ability to control the wavelength location of the LPGs attenuations peaks results in a polariser able to operate at almost any wavelength and birefringence. The maximum birefringence reported here as polarisation mode splitting was approximately 39±0.1nm with a polarisation loss of 10dB.

Original languageEnglish
Title of host publication21st international conference on Optical Fiber Sensors
EditorsWojtek J. Bock, Jacques Albert, Xiaoyi Bao
Place of PublicationBellingham, WA (US)
PublisherSPIE
Number of pages4
ISBN (Print)978-0-8194-8246-4
DOIs
Publication statusPublished - 17 May 2011
Event21st International Conference on Optical Fiber Sensors - Ottawa, ON, Canada
Duration: 15 May 201119 May 2011
http://www.ofs21.org/

Publication series

NameSPIE Proceedings
PublisherSPIE
Volume7753
ISSN (Print)0277-786X

Conference

Conference21st International Conference on Optical Fiber Sensors
Abbreviated titleOFS21
CountryCanada
CityOttawa, ON
Period15/05/1119/05/11
Internet address

Bibliographical note

Edward Davies; Kyriacos Kalli; Charalambos Koutsides; Tom Allsop and Lin Zhang, "UV inscribed long period gratings with femtosecond ablated axial fibre slots for polarization control", 21st International Conference on Optical Fiber Sensors, eds. Wojtek J. Bock; Jacques Albert; Xiaoyi Bao, Proc. SPIE 7753, 77539G (2011).

Copyright 2011 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

http://dx.doi.org/10.1117/12.885990

Keywords

  • femtosecond laser
  • long period grating
  • polariser

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