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. 2015 Mar 24;5:9399. doi: 10.1038/srep09399

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(a) Vertically translating the screw G_z along z-axis. The FBG bandwidth Δλ_B is changed whereas the central wavelength approximately is fixed. Δλ_B is about 0.8, 1, 1.4, 1.8, 2.2, 3, 3.4, and 4 nm from inner to outer, respectively. (b) Horizontally translating the screw G_x along x-axis. The central wavelength of FBG is tuned with the range of >20 nm, whereas the spectral profile changes slightly.