Wide-passband, temperature-insensitive, and compact π-phase-shifted long-period gratings in endlessly single-mode photonic crystal fiber

Yinian Zhu, Ping Shum, Hui Wen Bay, Xiaoyan Chen, Ching Hwee Tan, Chao Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

13 Citations (Scopus)


We demonstrate what is believed to be the first fabrication of a wide-passband, temperature-insensitive, and compact spectral filter based on a π-phase-shifted long-period grating in an endless single-mode photonic crystal fiber. By introducing a π-phase shift in the middle of a 12-period long-period grating, two symmetrical rejection bands at wavelengths of 1252.65 and 1418.7 nm are obtained with isolation higher than 18 dB and a passband bandwidth of 84.15 nm. The π-phase-shifted long-period gratings are inscribed by the relaxation of mechanical stress with the focused pulses of a CO 2 laser and a point-by-point technique without geometric deformation. The length of the spectral filter is ∼6.6 mm with a sensitivity of 8 pm/°C at a medium temperature range of 23-190°C.
Original languageEnglish
Pages (from-to)2608-2610
Number of pages3
JournalOptics Letters
Issue number22
Publication statusPublished - 15 Nov 2004
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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