Properties of PCF-based long period gratings

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal

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Original languageEnglish
Article number71
Pages (from-to)298-301
Journal / PublicationProceedings of SPIE - The International Society for Optical Engineering
Volume5855 PART I
Publication statusPublished - 2005


Title17th International Conference on Optical Fibre Sensors, OFS-17
Period23 - 27 May 2005


In a long period grating (LPG) made on a silica-based single material photonic crystal fiber (PCF), the effect of material dispersion on the resonance wavelength of the LPG is negligible. The resonance wavelength, the period and length of the LPG, and the diameter and pitch of the air-hole lattice of the PCF are found to obey a scaling law. Simulations show that the resonance wavelength has a non-monotonic dependence on the grating period and, for a particular grating period, there could exist dual resonance wavelengths and hence double transmission dips due to phase matching between the fundamental core mode and a cladding mode simultaneously at two wavelengths. This phenomenon may be explored for novel devices and sensor applications.

Research Area(s)

  • Beat length, Long period grating, Phase matching, Photonic crystal fiber