Investigation of long-period grating resonances in hollow-core photonic bandgap fibers

Long Jin, Wei Jin, Jian Ju, Yiping Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

19 Citations (Scopus)


The mode-coupling processes of long-period gratings (LPGs) fabricated in hollow-core photonic bandgap fibers are investigated. The LPGs are formed by periodic structural deformations induced by local heating generated by use of a pulsed CO2laser. Highly polarization-dependent grating resonances are observed in the transmission spectrum of the LPGs and found to be due to coupling from the fundamental to higher order core modes. The mode-coupling process is understood based on coupled local-mode theory: A single deformation of the holey cladding modifies the local-mode field profiles and induces fractional energy transfer between the fundamental and the higher order modes. Resonant coupling between a phase-matched fundamental/higher order mode pair is excited by having multiple such deformations arranged periodically along the fiber. The LPG spectrums are numerically modeled by solving the coupled local-mode equations at different wavelengths and found in agreement with the experimentally measured results.
Original languageEnglish
Article number5742661
Pages (from-to)1708-1714
Number of pages7
JournalJournal of Lightwave Technology
Issue number11
Publication statusPublished - 2 Jun 2011


  • Long-period grating (LPG)
  • photonic bandgap fiber

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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