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Optics Letters

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  • Vol. 30, Iss. 4 — Feb. 15, 2005
  • pp: 367–369

Strain-insensitive and high-temperature long-period gratings inscribed in photonic crystal fiber

Yinian Zhu, Ping Shum, Hui-Wen Bay, Min Yan, Xia Yu, Juanjuan Hu, Jianzhong Hao, and Chao Lu  »View Author Affiliations


Optics Letters, Vol. 30, Issue 4, pp. 367-369 (2005)
http://dx.doi.org/10.1364/OL.30.000367


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Abstract

We fabricate and demonstrate strain-insensitive and high-temperature long-period gratings in endlessly single-mode photonic crystal fiber by use of focused pulses of a CO2 laser and a periodic stress relaxation technique without geometrical deformation and elongation of the fiber. The thermal dependence of mode coupling at 1299.59 nm is 10.9 pm/°C from 24 to 992°C, whereas the coefficient of strain sensitivity is -0.192pm/µ epsilon up to the maximum strain of 2.74%epsilon. It is found for what is believed to be the first time that, in contrast with the traditional fiber case, the coupling resonance shifts toward shorter wavelengths under applied strain, indicating that the refractive index of the core is decreased as a result of the rebuilding of tension attributed to the stress-elastic effect, and the cladding modes is highly dispersive because of airholes arranged in the fiber cladding.

© 2005 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2340) Fiber optics and optical communications : Fiber optics components
(230.3990) Optical devices : Micro-optical devices

Citation
Yinian Zhu, Ping Shum, Hui-Wen Bay, Min Yan, Xia Yu, Juanjuan Hu, Jianzhong Hao, and Chao Lu, "Strain-insensitive and high-temperature long-period gratings inscribed in photonic crystal fiber," Opt. Lett. 30, 367-369 (2005)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-30-4-367


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