Specialty Optical Fibers Handbook

the plane of the bend). Note that bend attenuation is obtained by dividing the

bend loss by the arc length of the bend; with the removal of the effect of the arc

length, the bend attenuation scales with the inverse of the bend radius. The

generally good agreement between theory and measurement attests to the valid-

ity of the coupled-mode analysis.

Figure 10.20 displays the variation of bend loss with core radius for an

OmniGuide fiber with the same cladding as in Figs. 10.17 and 10.18. The bend

radius and wavelength used in this calculation are fixed at 10 cm and 10.6 mm,

respectively, while the bend angle is kept at 90 degrees. Two competing factors ...