Effect of irradiation symmetry of CO2 laser on mode coupling in long-period gratings inscribed in photonic crystal fiber

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)

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Detail(s)

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume8722
Publication statusPublished - 2013

Publication series

Name
Volume8722
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

TitleFiber Optic Sensors and Applications X
PlaceUnited States
CityBaltimore, MD
Period2 - 3 May 2013

Abstract

Long-period gratings (LPG) are inscribed in endlessly single mode (ESM) photonic crystal fiber (PCF) and conventional single mode fiber (SMF) with symmetric and asymmetric CO2 laser irradiation. Transmission measurements and near-field imaging indicate that symmetric index perturbation induced by laser irradiation with the aid of a 120° gold-coated reflecting mirror results in LP0n symmetric mode coupling, while asymmetric irradiation without using the mirror leads to LP1n asymmetric mode coupling for both fiber types. Symmetric irradiation yields far more reproducible LPG in PCF than asymmetric irradiation. On the other hand, the irradiation symmetry has little effect on the reproducibility of LPG inscribed in SMF due to the isotropy of its all-solid cladding structure. The removal of the outer solid cladding of PCFLPG results in a significant change in its transmission characteristics, which provides rich information on the refractive index perturbation and mode field distribution in the outer solid cladding of PCF-LPG. © 2013 SPIE.

Research Area(s)

  • CO2 laser, Long-period grating, Mode coupling, Photonic crystal fiber, Symmetric irradiation

Citation Format(s)

Effect of irradiation symmetry of CO2 laser on mode coupling in long-period gratings inscribed in photonic crystal fiber. / Tian, Fei; Kanka, Jiri; Zou, Bing; Chiang, Kin Seng; Du, Henry.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 8722 2013. 87220I.

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)