High-temperature sensitivity of long-period gratings in B-Ge codoped fiber

Xuewen Shu*, Thomas D.P. Allsop, Bashir Gwandu, Lin Zhang, Ian Bennion

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We report an investigation of thermal properties of long-period fiber gratings (LPFGs) of various periods fabricated in the conventional B-Ge codoped fiber. It has been found that the temperature sensitivity of the LPFGs produced in the B-Ge fiber can be significantly enhanced as compared with the standard telecom fiber. A total of 27.5-nm spectral shift was achieved from only 10 °C change in temperature for an LPFG with 240-μm period, demonstrating a first ever reported high sensitivity of 2.75 nm/°C. Such an LPFG may lead to high-efficiency and low-cost thermal/electrical tunable loss filters or sensors with extremely high-temperature resolution. The nonlinear thermal response of the supersensitive LPG was also reported and first explained.

Original languageEnglish
Pages (from-to)818-820
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number8
Publication statusPublished - Aug 2001


  • fiber Bragg gratings
  • long-period fiber grating
  • photosensitive fibers
  • temperature sensors
  • tunable filters


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