Optical fibre with chromatic dispersion compensation

Abstract

The invention relates to a multiband chromatic dispersion compensation optical fiber comprising successively, from the center toward the periphery, a central slice whose maximum index is higher than the index of the cladding, a buried slice whose minimum index is lower than the index of the cladding, and an annular slice whose maximum index is higher than the index of the cladding and lower than the maximum index of the central slice, a cladding of constant index, and having, on the one hand, at the wavelength of 1550 nm, firstly a chromatic dispersion of less than -8 ps/nm.km, secondly a chromatic dispersion to dispersion slope ratio whose absolute value is greater than 750 nm, and thirdly a mode diameter greater than 5 mum, and on the other hand, at the wavelength of 1625 nm, bending losses for a radius of 10 mm that are less than 400 dB/m.

Description

technical field [0001] The field of the invention is optical fibers for wavelength division multiplexed transmission networks. Background technique [0002] An increase in the bit rate of information on such a network imposes dispersion compensation and dispersion slope compensation over increasingly wider frequency bands. The S-band corresponds to a frequency band of about 1460 nm to 1530 nm. The C-band corresponds to a frequency band of about 1530 nm to 1565 nm. The L band corresponds to a frequency band of about 1565 nm to 1625 nm. The U-band corresponds to a frequency band of about 1625 nm to 1675 nm. The most widely used frequency band is the C-band. In addition to the C-band, it is increasingly desirable to use the C-band, S-band, L-band, or even the L-band. [0003] In the prior art, it is known to combine a dispersion-shifted fiber called a non-zero dispersion-shifted fiber (NZ-DSF) for reducing nonlinear crossover effects with a dispersion-compensating fiber (D...

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Problems solved by technology

[0004] For example, as described in patent application WO 01 / 01179, a first prior art solution employs a dispersion compensating fiber with a lower dispersion slope, however, the ratio of the dispersion to the dispersion slope of the fiber involved is too low and cannot effectively Compensation for NZ-DSF Transmission Line Fibers with Lower Dispersion Slope

[0005] In a second prior art solution presented at the OECC / IOOC'01 meeting, in a paper entitled "Dispersion flattened fiber with high negative dispersion", numerical simulations describe A dispersion compensating fiber with a very high ratio of dispersion to dispersion slope, however, those simulations presented orally at the same meeting did not confirm the above, but instead yielded usual values ​​including mode field diameters of the order of 4 μm

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