Raman amplifier, optical transmission system using such amplifier and pumping light source therefor
AssigneeSumitomo Electric Industries, Ltd.
InventorMasayuki Inoue
Life of this patent
Estimating the term…
Abstract
A Raman amplifier which can suppress the increase of MPI and enhances the amplification efficiency of signal light, and an optical transmission system using such amplifier are provided. The Raman amplifier comprises an optical fiber 10 having a reflection point at least at a first point 11 or second point 12, and a forward pumping source 21 and backward pumping source 22. In the pumping sources 21 and 22, the conditions for providing pumping light, such as whether to provide forward and backward pumping light and the power distribution between forward and backward pumping light, are designed in accordance with the location of the reflection point and reflection factor thereof in the optical fiber.
Claims10
A Raman amplifier comprising:
- an amplifying optical fiber provided with a reflection point having a predetermined reflection factor, and capable of exhibiting a predetermined input/output level of signal light, the signal light being Raman-amplified by pumping light while propagating through said fiber;
- a pumping light source for providing at least forward or backward pumping light;
- and
- an optical multiplexer for coupling said signal light and said pumping light,
- wherein power of said pumping light is designed such that difference between the maximum and actual values in the effective OSNR of said Raman amplifier is not more than 0.5 dB.
A pumping light source for providing forward pumping light and backward pumping light to an optical fiber, the pumping light source having a pumping light controller that can determine the power distribution ratio of said forward and backward pumping light in accordance with the location of reflection point and reflection factor of said optical fiber so that the difference between the maximum and actual values of the effective OSNR of said Raman amplifier is not more than 0.5 dB.
Dependencies are inferred from the claim text.