Specialty Optical Fibers Handbook

9.3.1 Standard Single-Mode Fibers

Since the introduction of FBG as a commercial product in 1995, the use of

FBG has increased in the telecommunications and the sensors fields [27], with

the development of new components built with SSMFs. Indeed, the filtering

capabilities (small insertion loss, low transmission loss, high wavelength select-

ivity) of FBGs make them an ideal candidate as well for add–drop filters and

dispersion compensators than for temperature or strain sensors. Most of the

FBG applications require gratings with high reflectivity, so fiber photosensitivity

is an important factor in the development of specific FBGs. For example dense

wavelength division multiplexers (DWDMs) require highly photosensitive fibers

for efficient inscription ...