Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/19703
Title: Gap FBG and its application in tunable narrow linewidth fibre laser
Authors: Yang, Y
Liu, X
Zhang, X
Jin, W 
Yang, M
Keywords: Bragg grating
Fibre ring laser
Gap fibre
Tunable filter
Issue Date: 2014
Publisher: Elsevier
Source: Optics and laser technology, 2014, v. 56, p. 114-118 How to cite?
Journal: Optics and laser technology 
Abstract: A gap fibre Bragg grating (g-FBG) is fabricated by cutting a uniform FBG in the middle to introduce a small air gap between the two sections. Numerical and experimental investigations show that the g-FBG has the characteristics of both a phase shifted FBG and a Fizeau interferometer. The peak transmission wavelength of the g-FBG can be finely tuned by adjusting the air-gap longitudinally or transversely with respect to the fibre central axis. With a g-FBG as tunable intra-cavity filter, a tunable fibre ring laser with a narrow line-width is demonstrated. The wavelength tuning range of the laser is 0.12 nm with an output power flatness better than 0.9 dB. The 3 dB spectral line-width is less than 12 pm and output power is 3.68 dBm.
URI: http://hdl.handle.net/10397/19703
ISSN: 0030-3992
DOI: 10.1016/j.optlastec.2013.06.038
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