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Wavelength shifter based on a laser in rare-earth-doped optical fibre
| Request number | 102.983 |
| Publication date | 2004-12-31 |
| Patent number | 102.983 |
| Grant date | 2005-04-22 |
| Inventors | Henrique Salgado , Igor Terroso, Joel Carvalho , Orlando Frazão |
The present invention is a wavelength shifter based on a rare-earth-doped-fibre in a ring formation that operates in dense-wavelength division multiplexing (DWDM) systems.
This new configuration presents a huge variety of components, including controllers of polarisation states, different optical elements that can be inserted into blocks, optical filters based on optical fibre Bragg gratings and amplifiers of rare-earth-doped fibre.
The configuration presents great flexibility in wavelength shifting over an extensive range of wavelengths. Other optical devices can be added to this one in order to improve its functioning.
Although the invention concerns a wavelength shifter that uses degenerate FMW (four wave mixing) to perform the conversion, further configurations are also presented that convert wavelengths using non-degenerate FWM.
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