Arc-Induced Long Period Fiber Gratings

Figure 5

(a) Spectrum of a symmetric 415 μm LPFG induced in the B/Ge codoped fiber using an external tension of 5.1 g and 60 discharges with 8.5 mA and 0.5 s; (b) spectrum of a 540 μm grating with a dual set of resonances inscribed simultaneously in the B/Ge codoped fiber after downshifting ~20 μm the fiber relatively to the arc and using an external tension of 23 g and 60 discharges of 9 mA and 0.5 s [33].

(a)

(b)