Optical fiber, and optical module and Raman amplifier using...

Details Optical fiber, and optical module and Raman amplifier using... Optical fiber, and optical module and Raman amplifier using...

2006-05-16

2006-05-16

Hellner, Mark (Department: 3663)

Optical: systems and elements

Optical amplifier

Optical fiber

C385S127000

Reexamination Certificate

active

07046433

ABSTRACT:
The present invention provides an optical fiber having dispersion of −8 ps
m/km or less at a wavelength of 1460 nm including a reference layer which is a reference of a refractive index profile and at least three glass layers that exist inside the reference layer, characterized in that when it is assumed that the maximum relative refractive index difference of the first glass layer formed innermost of the at least three glass layers with respect to the reference layer is Δ1, the relative refractive index difference of the second glass layer formed second from the inside with respect to the reference layer is Δ2, the relative refractive index difference of the third glass layer formed third from the inside with respect to the reference layer is Δ3and the relative refractive index difference of the reference layer with respect to pure quartz glass is ΔC, Δ1>Δ3>Δ2, Δ1≧1.0% and ΔC<0 are satisfied, and further provides an optical-module and a Raman amplifier using the optical fiber.

REFERENCES:
patent: 6470126 (2002-10-01), Mukasa
patent: 6661958 (2003-12-01), Hirano et al.
patent: 6859599 (2005-02-01), Mukasa
patent: 2002/0051611 (2002-05-01), Mukasa
patent: 2003/0063881 (2003-04-01), Hebgen et al.
U.S. Appl. No. 10/747,180, filed Dec. 30, 2003, Sugizaki et al.
U.S. Appl. No. 11/128,209, filed May 13, 2005, Hiroishi et al.

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