Optical signal amplifier, method of optical amplification and optical network
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorRodolfo Di Muro
Life of this patent
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Abstract
An optical signal amplifier for use in optical networks operating in a ring configuration comprising a first doped optical fiber loop pumped by a first laser and a second optical fiber loop pumped by a second laser.
Claims22
An optical signal amplifier for use in optical networks operating in a ring configuration comprising a first doped optical fibre loop pumped by a first laser, a first gain flattening filter, an optical splitter for splitting signal after the first gain flattening filter, a second optical fibre loop connected to a first output port of the splitter, said second optical fibre loop being pumped by a second laser, a second filter and an optical coupler for combining output of the second filter with the signal from a second output port of the optical splitter,
- wherein the first gain flattening filter is adapted to flatten characteristics of the signal only in part of its transmission range.
A method of gain control in an optical network operating in a ring configuration comprising:
- pumping by a first laser a first doped optical fibre loop to create a gain peak at a first wavelength, corresponding to an Amplified Spontaneous Emission peak of the first doped optical fibre loop;
- filtering the signal from the first doped optical fibre loop with a first gain flattening filter;
- splitting the signal received from the first gain flattening filter;
- pumping by a second laser a second optical fibre loop to create a gain peak at a second wavelength, corresponding to an Amplified Spontaneous Emission peak of the second optical fibre loop, wherein said second wavelength is shortened compared to said first wavelength and the second wavelength is outside the band of the channels along the ringed network, wherein the peak at the second wavelength acts as a gain stabilisation signal;
- filtering the signal from the second optical fibre loop with a second filter;
- and
- combining output of the second filter and the signal from the second output port of the optical splitter.
An optical network operating in a ring configuration comprising an optical signal amplifier comprising a first doped optical fibre loop pumped by a first laser, a first gain flattening filter, an optical splitter for splitting signal received from the first gain flattening filter, a second optical fibre loop connected to a first output port of the splitter, said second optical fibre loop being pumped by a second laser, a second filter and an optical coupler for combining output of the second filter with the signal from a second output port of the optical splitter.
Dependencies are inferred from the claim text.