Circularly polarized fiber in optical circuits

Details Circularly polarized fiber in optical circuits Circularly polarized fiber in optical circuits

G - Physics

02

B

G02B 6/10 (2006.01) G02F 1/35 (2006.01) H04B 10/135 (2006.01) H04B 10/18 (2006.01) H04J 14/02 (2006.01) H04J 14/06 (2006.01)

Patent

CA 2344682

The invention is directed to circularly polarized single mode waveguide fiber and to high data rate, multiplexed transmission systems that employ this fiber. The circularly polarized waveguide fiber attenuates the non-linear effects present in such high performance transmission links. In particular, self phase modulation is attenuated by more than 30 % and four wave mixing is essentially eliminated. This latter effect occurs because four wave mixing does not occur when a multiplexed link is made of a plurality of circularly polarized waveguide fibers which are arranged so that adjacent fibers have opposite circular polarization. The circularly polarized fiber enhances the non-linear effect of cross phase modulation, a feature that can be used in optical switching components associated with the transmission link. In addition, the strength of the XPM in CPF is independent of the relative polarization states of the signal and control pulses.

L'invention concerne une fibre guide d'onde monomode à polarisation circulaire et des systèmes de transmission multiplexés haut débit utilisant ladite fibre. La fibre à polarisation circulaire atténue les effets non linéaires présents dans ces voies de transmission rapides. En particulier, elle atténue de plus de 30 % l'automodulation de phase et supprime sensiblement le mélange à quatre ondes. Ce dernier phénomène est dû au fait que ledit mélange ne peut se produire dans une voie multiplexée constituée d'une pluralité de fibres à polarisation circulaire disposées de façon que les fibres adjacentes aient une polarisation circulaire opposée. La fibre atténue l'effet non linéaire de la modulation de phase croisée, caractéristique qui peut être utilisée dans les composants de commutation optique associés à la voie de transmission. En outre, l'importance de la modulation de phase croisée dans les fibres à polarisation circulaire est indépendante des états de polarisation relative du signal et des impulsions de commande.

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