Optical fiber

Details Optical fiber Optical fiber

2000-12-11

2002-12-03

Sanghavi, Hemang (Department: 2874)

Optical waveguides

Optical fiber waveguide with cladding

C385S126000

Reexamination Certificate

active

06490397

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an optical fiber used as an optical transmission line in a Wavelength Division Multiplexing (WDM) transmission system.
2. Related Background Arts
A WDM transmission system can transmit a large volume of information at high bit rates using light signals each having a different wavelength. Restraining nonlinear optical phenomena and widening a light signal range are important problems in the WDM transmission system.
The optical fiber disclosed in the Japanese patent application laid open 11-281840 has a dispersion null point at the nominal wavelength value of &lgr;
0
=1400 nm with an OH absorption peak, and the values of chromatic dispersion of this fiber are of negative sign in the 1310 nm window and of positive sign in the 1550 nm window. In both windows this optical fiber provides for values of dispersion sufficiently high to maintain optical non-linear effects, for example four-wave mixing generation, within tolerable limits for WDM operation, and can widen a light signal range as well. This optical fiber is hereinafter called “the 1380 nm zero-dispersion fiber”.
Chromatic dispersions of the 1380 nm zero-dispersion fiber are positive in a wide wavelength range (1450-1620 nm) that includes S-band (1450-1530 nm), C-band (1530-1560 nm) and L-band (1560-1620 nm). In the past there was no dispersion compensating optical fiber which compensated the chromatic dispersions of the 1380 nm zero-dispersion fiber at all of the wavelengths in the range of 1450 nm to 1620 nm.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an optical fiber whose chromatic dispersions have an opposite sign relative to those of the 1380 nm zero-dispersion fiber at all of the wavelengths in the range of 1450 nm to 1620 nm, and can compensate the dispersions of 1380 nm zero-dispersion fiber.
In order to achieve this and other objects, an optical fiber is provided whose chromatic dispersions are negative at all of the wavelengths in the range of 1450 nm to 1620 nm, having chromatic dispersions of −7 ps·nm
−1
·km
1−
or more but −1 ps·nm
−1
·km
1−
or less at a wavelength of 1450 nm, −12 ps·nm
−1
·km
1−
or more but −5 ps·nm
−1
·km
1−
or less at a wavelength of 1550 nm and −17 ps·nm
−1
·km
1−
or more but −6 ps·nm
−1
·km
1−
or less at a wavelength of 1620 nm.
The above and further objects and novel features of the invention will be more fully clarified from the following detailed description when the same is read in connection with the accompanying drawings. It is to be expressly understood, however, that the drawings are for the purpose of illustration only and are not intended as a definition of the limits of the invention.


REFERENCES:
patent: 4412722 (1983-11-01), Carnevale et al.
patent: 4435040 (1984-03-01), Cohen et al.
patent: 5448674 (1995-09-01), Vengsarkar et al.
patent: 5684909 (1997-11-01), Liu
patent: 5822488 (1998-10-01), Terasawa et al.
patent: 5838867 (1998-11-01), Onishi et al.
patent: 5905838 (1999-05-01), Judy et al.
patent: 6009221 (1999-12-01), Tsuda
patent: 6317549 (2001-11-01), Brown
patent: 6343176 (2002-01-01), Li et al.
patent: 11-281840 (1999-10-01), None

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