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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 24, Iss. 12 — Dec. 1, 2006
  • pp: 5087–5094

Low Thermal Sensitivity Grating Devices Based on Ex-45° Tilting Structure Capable of Forward-Propagating Cladding Modes Coupling

Kaiming Zhou, Lin Zhang, Xianfeng Chen, and Ian Bennion

Journal of Lightwave Technology, Vol. 24, Issue 12, pp. 5087-5094 (2006)

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The authors describe a detailed investigation on tilted fiber Bragg grating (TFBG) structures with tilted angles exceeding 45°. In contrast to the backward mode coupling mechanism of Bragg gratings with normal and small tilting structures, the ex-45° TFBGs facilitate the light coupling to the forward-propagating cladding modes. The authors have also theoretically and experimentally examined the mode coupling transition of TFBGs with small, medium, and large tilt angles. In particular, experiments are conducted to investigate the spectra and far-field distribution, as well as temperature, strain, and refractive-index sensitivities of ex-45° devices. It has been revealed that these ex-45° gratings exhibit ultralow thermal sensitivity. As in-fiber devices, they may be superior to conventional Bragg and long-period gratings when the low thermal cross sensitivity is required.

© 2006 IEEE

Kaiming Zhou, Lin Zhang, Xianfeng Chen, and Ian Bennion, "Low Thermal Sensitivity Grating Devices Based on Ex-45° Tilting Structure Capable of Forward-Propagating Cladding Modes Coupling," J. Lightwave Technol. 24, 5087-5094 (2006)

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