Optical fiber

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G02B 514

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042069670

ABSTRACT:
A three-layer structure optical fiber comprises a first transparent dielectric core layer having a relatively high refractive index, a second transparent dielectric intermediate layer having a relatively low refractive index and a third transparent dielectric cladding layer having an intermediate refractive index wherein the parameter of the optical fiber is determined as follows: ##EQU1## where B is the bandwidth of the signal to be transmitted, z is the transmission distance, C is the velocity of light in vacuum, .eta.o is the refractive index of the core layer, q is the ratio of refractive indices between the core layer and second layer, V = normalized frequency, ##EQU2## p is the ratio of refractive index between the core layer and the third layer, and U.sub.11 =2,405.

REFERENCES:
patent: 3997241 (1976-12-01), Nishida et al.
Kawakami et al., "Characteristics of a Doubly Clad Optical Fiber . . . " IEEE Jour. of Quantum Elec., vol. QE-10, No. 12, Dec. 1974, pp. 879-887.
Miyagi et al., "Bending Losses of a Double Clad Slab Waveguide" Optics Communications, vol. 14, No. 1, May 1975, pp. 123-125.

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