Optical fiber

Details Optical fiber Optical fiber

2011-01-25

2011-01-25

Doan, Jennifer (Department: 2874)

Optical waveguides

Optical fiber waveguide with cladding

Utilizing multiple core or cladding

C385S123000, C385S126000, C385S127000

Reexamination Certificate

active

07876991

ABSTRACT:
An optical fiber which reduces transmission loss increase even in a high humidity environment or under water is provided. To solve the above issue, an optical fiber according to the present invention comprises a glass optical fiber coated with at least two coating layers, soft and hard layers. The optical fiber is further coated by a colored resin to make a colored optical fiber. The hard layer and the color layer of the colored optical fiber have a free volume radius of at least 0.290 nm according to positron annihilation lifetime spectroscopy.

REFERENCES:
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patent: 2008/0112676 (2008-05-01), Nakajima et al.
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U.S. Appl. No. 12/626,814, filed Nov. 27, 2009, Nakajima, et al.
Hong-Ling Li, et al., Estimation of Free Volume in Polymers by Positron Annihilation Lifetime Technique', (1998), pp. 37-46 (with English translation of Abstract).
N. Akasaka, et al., “Design of Optical Fiber Coating”, ACOFT 94 (1994), pp. 375-378.
U.S. Appl. No. 12/770,807, filed Apr. 30, 2010, Nakajima, et al.

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