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US 7,583,432 B2Granted
Amplified optical ring transmission system
AssigneeEricsson Inc.
InventorsPierpaolo Ghiggino, Francesco Poletti, Giovanni Razzetta, Piergiorgio Sessarego
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Abstract
A ringed optical transmission system comprises along the ring rare earth doped fiber amplifiers. The system has a gain peak with a λASE wavelength outside the λ1-λn band of the channels transmitted along the ring, the wavelength corresponding to an ASE emission peak of the amplifiers in the ring. In this manner a lasing peak forming a gain stabilization signal is produced.
Claims13
A gain control method in an optical transmission system having rare earth doped amplifiers along a ring, the method comprising the steps of:
- a) positioning a gain peak at a wavelength outside a band of channels transmitted along the ring, the wavelength corresponding to an amplified spontaneous emission (ASE) emission peak of the amplifiers in the ring to produce a lasing peak;
- and
- b) employing the lasing peak as a gain stabilization signal.
An optical transmission system, comprising:
- a) a ring;
- b) a plurality of rare earth doped fiber amplifiers along the ring;
- c) positioning apparatus for positioning a gain peak at a wavelength outside a band of channels transmitted along the ring, the wavelength corresponding to an amplified spontaneous emission (ASE) emission peak of the amplifiers in the ring so as to produce a lasing peak;
- and
- d) stabilization apparatus for employing the lasing peak as a gain stabilization signal.
2 more elements
Dependencies are inferred from the claim text.