Induced Bragg Gratings in Optical Fibers and Waveguides Using an Ultrafast Infrared Laser and a Phase Mask

Figure 10

Microscope images of photoinduced index modulation in SMF-28; (see Figure 10(a)). The fiber is imaged near the core and is viewed normal to the beam axis. In Figure 10(b) the fiber is rotated 90^° and is viewed along the beam axis.

(a)

(b)