Structural long period gratings made by drilling micro-holes in photonic crystal fibers with a femtosecond infrared laser

Shujing Liu, Long Jin, Wei Jin, Dongning Wang, Changrui Liao, Ying Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

72 Citations (Scopus)


We present a new method for fabricating structural long-period gratings (LPGs) in photonic-crystal fibers (PCFs The method is based on periodically drilling holes into the PCF cladding along the length of the fiber by use of a focused femtosecond infrared laser. A very short LPG with only 9 periods and a grating length of < 4 mm exhibited resonance strength of over 20 dB and a polarization dependent loss of 25 dB. The high resonance strength is attributed to the strong modulated mode-field profile caused by the significant perturbation of the fiber geometry. The mechanism of LPG formation is discussed based on coupled local-mode theory.
Original languageEnglish
Pages (from-to)5496-5503
Number of pages8
JournalOptics Express
Issue number6
Publication statusPublished - 15 Mar 2010

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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