C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
C03B 37/027 (2006.01) C03B 37/03 (2006.01) G02B 6/10 (2006.01) G02B 6/16 (1995.01)
Patent
CA 2098747
The presence of (typically unintended) birefringence in single mode optical fiber can severely limit the usefulness of the fiber for, e.g., high bit rate or analog optical fiber communication systems, due to the resulting polarization mode dispersion (PMD). It has now been discovered that PMD can be substantially reduced if, during drawing of the fiber (13), a torque is applied to the fiber such that a "spin" is impressed on the fiber. Desirably the torque is applied such that the spin impressed on the fiber does not have constant spatial frequency, e.g., has alternately clockwise and counterclockwise helicity. At least a portion of optical fiber according to the invention has a spin whose spatial frequency exceeds 4 spins/meter.
La présence de biréfringence (en général non voulue) dans une fibre optique monomode peut limiter sérieusement l'utilité de la fibre pour, p. ex., des systèmes de communication à fibres optiques à débit binaire élevé ou analogiques, en raison de la dispersion en mode polarisation (PMD) résultante. Nous savons maintenant que la PMD peut être sensiblement réduite si, pendant le fibrage (13), un couple est appliqué à la fibre de manière à lui imprimer une « torsade ». Il est souhaitable que le couple soit appliqué de façon que la torsade imprimée à la fibre n'ait pas une fréquence spatiale constante, p. ex. une hélicité alternativement en sens horaire et antihoraire. Conformément à l'invention, au moins une partie de la fibre optique a une torsade dont la fréquence spatiale dépasse 4 torsades/mètre.
Hart Arthur Clifford Jr.
Huff Richard Garner
Walker Kenneth Lee
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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