Abstract: The invention relates to a dispersion shifted monomode optical fiber which, in the wavelength range 1400 nm to 1650 nm, presents both a chromatic dispersion maximum and a chromatic dispersion slope of absolute value less than 0.05 ps/nm2·km. Advantageously, the maximum in the wavelength wave 1400 nm to 1650 nm is a single maximum. The fiber also presents dispersion having a slope of absolute value less than 0.03 ps/nm2·km in the wavelength range 1530 nm to 1580 nm. The fiber of the invention is particularly suitable for wavelength division multiplexed transmission systems.

Abstract: The invention concerns a monomode optical fiber having at a wavelength of 1550 nm a dispersion slope from −0.8 ps/nm2.km to −0.5 ps/nm2.km and a chromatic dispersion from −130 ps/nm.km to −90 ps/nm.km, the fiber having a cladding and a core whose index profile features a central part having an index higher than that of the cladding, a ring having an index higher than that of the cladding and lower than that of the central part, and a trench between the central part and the ring having an index lower than that of the cladding, and the use of a fiber of this kind to compensate dispersion. The fiber of the invention finds applications in high bit rate transmission systems in particular. The invention also concerns a wavelength division multiplex optical fiber transmission system comprising at least one section of fiber in accordance with the invention.

Abstract: The invention relates to a dispersion-shifted optical fiber comprising a core and cladding, with an index profile of shape consisting of a rectangular central portion surrounded by an annular portion of index lower than the index of the cladding, and then by the cladding, with a zero chromatic dispersion at a wavelength value &lgr;0 lying in the range 1380 nm to 1450 nm, and with chromatic dispersion at 1550 nm lying in the range 8 ps/nm·km to 12 ps/nm·km. The invention also relates to the use of such an optical fiber in a wavelength division multiplexed system.

Abstract: The invention relates to a dispersion-shifted single-mode optical fiber having: cladding of given refractive index (ns); and a fiber core having an index profile that is Gaussian with a pedestal, i.e. a “dual shape core” index profile; said fiber being characterized in that the index profile of the fiber core has an outer ring of index (n3) greater than the index (ns) of the cladding. The invention provides better control over the wavelength at which chromatic dispersion is zero, while conserving the other transmission characteristics of known fibers, such as mode diameter and attenuation.

Abstract: A stepped index optical fiber is disclosed having a chromatic dispersion cancellation wavelength less than 1 280 nm or even 1 250 nm. The fiber can be used for wavelength-division multiplex transmission not only in the window around 1 550 nm but also in the window around 1 300 nm. The chromatic dispersion in the second window enables transmission without excessively penalizing non-linear effects. A fiberoptic transmission system which uses the above fiber as line fiber is also disclosed.

Abstract: The invention relates to a dispersion-shifted single-mode fiber having cladding of given refractive index (ns) and a fiber core having an index profile that is in the shape of a trapezium, a triangle, or a rectangle, together with a first ring, the index profile of the fiber core having an outer, second ring of index (n3) greater than the index of said cladding (ns), said fiber being characterized in that the index (n3) of said second ring is greater than or equal to the index (n2) of said first ring. The invention provides better control over the wavelength at which chromatic dispersion is zero, while conserving the other transmission characteristics of known fibers, such as mode diameter and attenuation.