Low slope dispersion managed waveguide

G - Physics – 02 – B

Patent

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G02B 6/34 (2006.01)

Patent

CA 2318423

Disclosed is a single mode optical waveguide fiber having alternating segments of positive and negative dispersion and dispersion slope. The relative indexes, the refractive index profiles and the radii of the segments are chosen to provide low total dispersion and dispersion slope. One embodiment consists of a first central major index profile (10) of outer radius r1, surrounded by a first annular segment (12) of outer radius r2, surrounded by second annular segment (14) of outer radius r3. Preferred waveguides in accordance with the invention exhibit a dispersion over the range of 1520 to 1625 nm which at all times have a magnitude which is less than 2, and more preferably less than 1 ps/nm2-km. The total dispersion of the waveguide fiber is in the range of about -2.0 to +2.0 ps/nm-km at 1550 nm. The waveguide also features a low polarization mode dispersion.

L'invention concerne une fibre de guide d'onde optique monomode présentant une alternance de segments à dispersion et pente de dispersion positive et négative. Les indices relatifs, les profils d'indices de réfraction et les rayons des segments sont choisis de manière à offrir une faible dispersion totale et une faible pente de dispersion. Une réalisation de l'invention présente un premier profil (10) d'indice majeur central de rayon extérieur r1, entouré d'un premier segment annulaire (12) de rayon extérieur r2, lui-même entouré d'un second segment annulaire (14) de rayon extérieur r3. Les guides d'onde préférés selon l'invention présentent une dispersion de l'ordre de 1520 à 1625 nm, dont la grandeur reste en permanence inférieure à 2, et de préférence, inférieure à 1ps/nm?2¿-km. La dispersion totale de la fibre de guide d'onde est de l'ordre de -2,0 à +2,0 ps/nm-km à 1550 nm. Le guide d'onde est également caractérisé par une faible dispersion en mode polarisation.

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