Room-temperature operation of widely tunable loss filter

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

Research output: Contribution to journalArticlepeer-review


A widely tunable and room-temperature operationable loss filter based on a long-period fibre grating (LPFG) fabricated in a B/Ge codoped fibre is reported. The filter exhibits extremely high temperature sensitivity. A maximum spectral shift of -48.1 nm from 10 to 40°C is achieved, corresponding to a thermal tuning efficiency of 1.6nm/°C. This value is increased by more than one order of magnitude compared with the LPFGs fabricated in standard telecom fibre, and even twice that of a LPFG with sensitivity enhanced by a special polymer.

Original languageEnglish
Pages (from-to)216-218
Number of pages3
JournalElectronics letters
Issue number4
Publication statusPublished - 15 Feb 2001


  • boron componds
  • diffraction gratings
  • germanium compounds
  • optical fibre filters


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