US 6,807,373 B1Granted

Multiband Raman amplifier

AssigneeAlcatel

InventorsDenis Toullier, Jean-Pierre Blondel, Eric Brandon, Patrice Le Roux

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Abstract

The invention relates to a system for injecting into a fiber signals from multiple sources at different wavelengths. The signals from each source are injected into the fiber by a circulator. The circulators of the various sources are cascaded. Reflector means for reflecting signals from sources previously injected are provided between each source and its circulator. The invention is used to inject signals from multiple sources without the injection of signals from one source attenuating signals from sources previously injected. It applies in particular to Raman amplification, for which purpose it provides a multiband source without attenuation between bands. Multiband amplifications is achieved without loss of gain between bands.

Claims14

Dependent claims

A system for injecting, into an amplifier fiber, pumping signals from multiple pumping sources at different wavelengths, the system comprising:

an output via which a transmission signal that is amplified by the amplifier fiber exits said system,
a first pumping signal source supplying a first pumping signal,
a first circulator with a first input connected to the first pumping signal source, a second input supplying the first pumping signal from the first pumping signal source and receiving the transmission signal, and a third input supplying the transmission signal to said output,
a second pumping signal source supplying a second pumping signal, and
a second circulator with a first input connected to the second signal source via reflector means for reflecting the first pumping signal from the first pumping signal source, a second input supplying the first and second pumping signals from the first and second pumping signal sources and receiving the transmission signal, and a third input connected to a second input of the first circulator, receiving the first pumping signal from the first circulator and supplying the transmission signal to the first circulator.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/597,081Filed 20 Jun 2000
Priority: FR 99 0781421 Jun 1999
Granted: 19 Oct 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04B 10/2916
Characterised by the medium used for amplification or processing: using Raman or Brillouin amplifiers
H01S 3/094003
By coherent light: the pumped medium being a fibre
H01S 3/302
Using scattering effects, e.g. stimulated Brillouin or Raman effects: in an optical fibre
G02B 6/2932
With a cascade of diffractive elements or of diffraction operations: comprising a directional router, e.g. directional coupler, circulator