Hybrid raman/erbium-doped fiber amplifier and transmission...

H - Electricity – 04 – B

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H04B 10/17 (2006.01) H01S 3/067 (2006.01) H01S 3/30 (2006.01) H01S 3/094 (2006.01) H01S 3/16 (2006.01) H01S 3/23 (2006.01)

Patent

CA 2422206

A hybrid Raman-EDFA provides gain equalization over the C-band and L-band. The hybrid Raman-EDFA includes a Raman section producing a Raman gain and an EDFA section producing an EDFA gain complimenting the Raman gain. The EDFA section preferably includes a highly inverted, single-stage EDFA to produce the complimenting EDFA gain shape. One embodiment of the EDFA section includes a high return loss termination located after the erbium fiber to receive unabsorbed pump power. Multiple hybrid Raman-EDFAs can be connected in an amplifier chain in a transmission system. The transmission system preferably provides a dispersion map including regular composite fiber spans followed by at least one compensating span of negative dispersion fibers. The Raman sections of the hybrid Raman-EDFAs are preferably coupled to negative dispersion fiber in the transmission system.

Un amplificateur (EDFA) Raman hybride optique à fibre dopée à l'erbium fournit une égalisation du gain dans la bande C et dans la bande L. Cet amplificateur comprend une section Raman qui présente un gain Raman et une section EDFA qui produit un gain EDFA complétant le gain Raman. La section EDFA comprend de préférence un EDFA étage unique et à inversion importante, pour produire la forme de gain EDFA complémentaire. Une version de la section EDFA comprend une terminaison d'affaiblissement de réflexion élevé, située après la fibre dopée à l'erbium pour recevoir la puissance de pompe non absorbée. Il est possible de raccorder de multiples EDFA Raman hybrides dans une chaîne amplificatrice de système de transmission. Ce système fournit de préférence une carte de dispersion qui comprend des portées ordinaires de fibres composites, suivies d'au moins une portée de compensation de fibres de dispersion négative. Les sections Raman de l'EDFA Raman hybride sont accouplées de préférence à la fibre de dispersion négative du système de transmission.

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