Optical fiber and optical transmission path that uses the...

Details Optical fiber and optical transmission path that uses the... Optical fiber and optical transmission path that uses the...

2005-08-09

2005-08-09

Ullah, Akm Enayet (Department: 2874)

Optical waveguides

With optical coupler

Plural

Reexamination Certificate

active

06928211

ABSTRACT:
There is provided at low cost an optical fiber suitable for wavelength division multiplex transmissions that has strengthened the tolerance to bending loss at even smaller bending diameters. The present invention is an optical fiber whose base material is silica glass and that has a two layer structure formed by a core that has a substantially uniform refractive index and by a cladding that is located outside the core and that has a substantially uniform refractive index, wherein the optical fiber satisfies the following conditions (1) to (3): (1) an outer diameter of the core is in a range of 4 to 8 μm, and a relative refractive index difference of the core is in a range of 0.4 to 0.8%; (2) chromatic dispersion at a wavelength of 1550 nm is in a range of 2 to 15 ps
m/km; and (3) effective area at a wavelength of 1550 nm is 40 μm2or more.

REFERENCES:
patent: 0 789 257 (1997-08-01), None
patent: 1 146 358 (2001-10-01), None
Jun-ichi Sakai et al., “Bending Loss of propagation Modes in Arbitrary-Index Profile Optical Fibers” Applied Optics, Optical Society of America, Washington, U.S., vol. 17, No. 10, May 15, 1978, pp. 1499-1506.
D. Marcuse, “Loss Analysis of Single-Mode Fiber Splices”, Bell System Technical Journal, AT&T, Short Hills, NY, U.S., vol. 56, No. 5, May 1977, pp. 703-718.

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