Dispersion compensating fiber

Details Dispersion compensating fiber Dispersion compensating fiber

H - Electricity

04

B

H04B 10/18 (2006.01) C03B 37/014 (2006.01) G02B 6/036 (2006.01)

Patent

CA 2370448

Disclosed is a dispersion compensating optical fiber that includes a core surrounded by a cladding layer of refractive index nCL. The core includes at least three radially adjacent regions, a central core region, a moat region having a refractive index nM that is sufficiently lower than nCL such that .DELTA.M <= -0.4 %, and a ring region. As the ring region exhibits sufficiently high refractive index at a sufficiently long distance from the outer edge of the moat region, the fiber can exhibit low values of negative dispersion slope at low values of negative dispersion and yet exhibit good bending loss. This ring region is also capable of imparting to the fiber a relatively high cutoff wavelength, so that the present invention is particularly well suited for use in L-band systems. A particularly suitable fiber has an index profile in which that part of the ring region at the transition between the moat and the ring region has a refractive index such that its delta value is close to zero. Also disclosed is a method of forming the fiber of the present invention.

L'invention concerne une fibre de compensation de la dispersion comprenant une âme entourée d'une couche de métallisation d'indice de réfraction nCL. L'âme présente au moins trois zones radialement adjacentes, une zone âme centrale, une zone douve ayant un indice de réfraction nM suffisamment inférieur à nCL de manière que .DELTA.¿M? <= -0,4 % ainsi qu'une zone anneau. Comme la zone anneau fait preuve d'un indice de réfraction suffisamment élevé à une distance suffisamment éloignée du bord externe de la zone douve, la fibre peut avoir des valeurs faibles de pente de dispersion négative à des valeurs faibles de dispersion négative, ce qui entraîne une bonne perte par courbure. La zone anneau est aussi en mesure de conférer à la fibre une longueur d'onde seuil relativement élevée afin qu'elle s'adapte aux systèmes à bande L. Une fibre particulièrement adaptée est celle dont la partie de la zone anneau au niveau de la transition entre la zone douve et la zone annulaire a un indice de réfraction tel que sa valeur delta est voisine de zéro. L'invention concerne aussi un procédé de formation de cette fibre.

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