Optical fiber for attenuating optical signal

Details Optical fiber for attenuating optical signal Optical fiber for attenuating optical signal

2006-08-15

2006-08-15

Connelly-Cushwa, Michelle (Department: 2874)

Optical waveguides

Accessories

Attenuator

C385S123000, C385S141000

Reexamination Certificate

active

07092610

ABSTRACT:
In order to supply the optical fiber for attenuating optical signal enable the attenuation amount to become flat in wide wavelength scope, simultaneously adding at least two kinds of dopants for attenuating optical signal over the core and the cladding of the optical fiber. Then, properly adjusting the kind and the concentration of dopants for manufacturing the optical fiber1for attenuating optical signal; simultaneously adding the dopant enabling the absorption of optical signal to increase with the wavelength become long and the dopant enabling the absorption of optical signal to decrease with the wavelength become long. As the dopant, it is desired to select at least two kinds of transitional metals from Co, Ni, Cr, V, Fe, Mn, Tb and Tm. Further, as the doped area, it is desired to dope the 6 times of the center portion of the core from the center of the core.

REFERENCES:
patent: 5572618 (1996-11-01), DiGiovanni et al.
patent: 5633974 (1997-05-01), Chia
patent: 5841926 (1998-11-01), Takeuchi et al.
patent: 6498888 (2002-12-01), Chenard et al.
patent: 6748151 (2004-06-01), Watanabe et al.
patent: 6757473 (2004-06-01), Han et al.

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