Technique for reducing polarization dependent gain in an...

Details Technique for reducing polarization dependent gain in an... Technique for reducing polarization dependent gain in an...

H - Electricity

04

B

H04B 10/18 (2006.01) H04B 10/17 (2006.01)

Patent

CA 2115862

A technique employing a depolarized optical source to reduce the polarization dependent gain associated with the optical pump signal used to excite doped fiber amplifiers within an optical transmission system. Pumping the doped fiber amplifiers with a signal that has no single predominant linear SOP, equalizes the gain of the amplifiers. A particular embodiment of the invention includes a pump comprised of a passive polarization scrambler coupled to the output of a multifrequency optical laser. The simple, passive arrangement keeps overall system costs to a minimum and increases reliability.

Technique faisant appel à une source optique dépolarisée pour réduire le gain dépendant de la polarisation associé au signal d'une pompe optique utilisée pour exciter les amplificateurs à fibre dopée faisant partie d'un système de transmission optique. Le pompage des amplificateurs à fibre dopée au moyen d'un signal ne présentant aucun état de polarisation linéaire prédominant unique, permet d'égaliser le gain des amplificateurs. Une configuration particulière de cette invention comporte une pompe placée dans un brouilleur de polarisation passif relié à la sortie d'un laser optique multifréquence. Cet arrangement passif et simple permet de réduire les coûts du système dans son ensemble et d'augmenter sa fiabilité.

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