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Bending losses of coated single-mode optical fibers

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2 Author(s)
Murakami, Yasuji ; Nippon Telegraph and Telephone Public Corp., Musashino-shi, Tokyo, Japan ; Tsuchiya, H.

Peaks appear in bending losses of coated single-mode fibers due to interference between the guided mode and rays which are radiated from the guided mode and are reflected at cladding-coating boundary. This paper reports derivation of bending loss formulas for coated slab waveguides and coated fibers. Plane wave concepts are also used to explain the appearance of the loss peaks. Measurements were performed by using two coated single-mode fibers. The agreement between theory and experimental results is found to be excellent. It is possible to obtain the refractive index difference from measured peak wavelengths.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:14 ,  Issue: 7 )