1976-11-01
1980-01-22
Hille, Rolf G.
350 9631, G02B 514
Patent
active
041847440
ABSTRACT:
In order to make the transmission loss of the lowest order leaky mode over the transmission length 10dB or more, an optical fiber for optical transmission is constructed of a cladding layer whose refractive index is constant, an intermediate layer which has a constant refractive index lower than the refractive index of the cladding layer, and a core whose refractive index is continuously varied so as to be the highest at the central part and to be substantially equal to that of the cladding layer at the peripheral part, and the thickness of the intermediate layer is 0.1-1 times the radius of the core.
REFERENCES:
patent: 3778132 (1973-12-01), Pinnow et al.
patent: 3785718 (1974-01-01), Gloge
patent: 3963468 (1976-06-01), Jaeger et al.
patent: 4033667 (1975-07-01), Fleming, Jr.
D. Marcuse "Mode Mixing with Reduced Losses in Parobalic Index Fibers" BSTJ Vol. 55, No. 6, Jul.-Aug. 1976, pp. 777-802.
Onoda Seiichi
Sumi Masao
Tanaka Toshiki P.
Hille Rolf G.
Hitachi , Ltd.
Hitachi Cable Ltd.
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