TITLE

Temperature-insensitive compact phase-shifted long-period gratings induced by surface deformation in single-mode fiber

AUTHOR(S)
Zheng, Shijie; Lei, Xiaohua; Zhu, Yinian
PUB. DATE
December 2015
SOURCE
Applied Physics B: Lasers & Optics;Dec2015, Vol. 121 Issue 3, p259
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We present a temperature-insensitive compact phase-shifted long-period grating (PS-LPG) induced by using focused pulse CO laser via point-by-point technique. By introducing a phase shift with 1800° ( π shift) in the center of the long-period grating (~420 µm per period, 20 periodicity in total), the original coupling resonance at 1318.55 nm splits into two symmetrical spectral peaks at 1283 and 1348 nm. FWHM between those two peaks is 36.55 nm, and the power intensities of two peaks are the same as −10.2 dB. The thermal characteristic of the PS-LPGs is around 8.8 pm/°C that is less than that of fiber Bragg grating (12 pm/°C). As a result, such fiber grating devices can be applied in a laser cavity as an all-fiber filter. Variation of phase shifts in LPGs give rise to different spectral peaks of coupled resonance, which makes the proposed PS-LPGs as a good candidate for the applications in sensing networks and optical telecommunications.
ACCESSION #
111176894

 

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