Ultrashort Long-Period Fiber Grating Sensors Inscribed on a Single Mode Fiber Using Laser Radiation

Figure 5

Transmission spectra (taken on air, at 22°C) of two ultrashort LPFGs with (a) 2.4 mm and (b) 4.8 mm length, a 600 μm period, written on SMF-28 optical fibers ( ≈ 4.5 W; = 0.6 s; ≈ 0.78 N).

(a)

(b)