Wavelength drift of PMMA-based optical fiber bragg grating induced by optical absorption

Wei Zhang, Ada Abang, David J. Webb, Gang-Ding Peng

Research output: Contribution to journalArticlepeer-review


The transmission loss in polymer optical fiber (POF) is much higher than that in silica fiber. Very strong absorption bands dominate throughout the visible and near infrared. Optical absorption increases the internal temperature of the polymer fiber and reduces the wavelength of any POF Bragg grating (POFBG) inscribed within the fiber. In this letter, we have investigated the wavelength drift of FBGs inscribed in poly(methyl methacrylate)-based fiber under illumination at different wavelengths. The experiments have shown that the characteristic wavelength of such a POFBG starts decreasing after a light source is applied to it. This decrease continues until equilibrium inside the fiber is established, depending on the surrounding humidity, optical power applied, and operation wavelength.

Original languageEnglish
Pages (from-to)336-339
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number4
Early online date4 Dec 2014
Publication statusPublished - 15 Feb 2015

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  • fiber bragg gratings
  • humidity dependence
  • photothermal effects polymer optical fiber


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