Specialty Optical Fibers Handbook

between 5 microns and the radiation caustic, represents a tunneling barrier of

greater area in the case of the depressed cladding fiber.

Depressed cladding fibers can improve performance in scenarios where low

bending losses are important, such as indoor optical wiring, access networks,

jumpers, ribbon corner fibers, cables with tight packing densities, and cables

intended for very low temperature applications. At the time of this writing, high-

quality matched clad fibers are usually specified as having less than 0.05 dB/100

turns for loops of radius R ¼ 25 and 30 mm at 1625 nm and less than 0.05 dB/

turn for loop of radius R ¼ 16 mm at 1550 nm.