Experimental characterization of the spectra of etched long-period grating pairs

Jin Fei Ding, Aping Zhang, Hong Yan Fu

Research output: Journal article publicationConference articleAcademic researchpeer-review


After an analysis of the spectral characteristics of the long-period grating (LPG) with decreasing the fiber cladding diameter, we experimentally investigated the spectra of etched LPG pairs (LPGPs) with ∼3 dB transmissivity (as infiber M-Z interferometers). The evolutions of the transmission spectra were characterized as the cladding diameters were decreased by HF etching process. A shift of the stop-band of LPG and interference pattern of LPGP to longer wavelength was observed with the reduction of cladding diameter, in which that of higher order cladding mode induced a larger shift. The responses of the LPGs and LPGPs with different etching degrees to the change of the surrounding refractive-index were measured, and an increased sensitivity is observed in the experiment.
Original languageEnglish
Article number60193H
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume6019 II
Publication statusPublished - 1 Dec 2005
Externally publishedYes
EventPassive Components and Fiber-based Devices II - Shanghai, China
Duration: 7 Nov 200510 Nov 2005


  • Etching process
  • Long-period grating
  • Mach-Zhender interferometer
  • Optical fiber sensor
  • Refractive-index measurement

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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