Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1998-04-07
1999-11-02
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359160, 359177, 359337, 385 12, 385 27, H04B 1016, H04J 1402, H01S 300
Patent
active
059781319
ABSTRACT:
The amplifier is a two-stage amplifier in which dispersion compensation and WDM channel equalization are carried out using a plurality of in-waveguide Bragg gratings placed between the two stages. The first stage has a gain able to raise the intensity of WDM optical communications signals to a high enough level that after dispersion compensation and equalization, the signals fed into the second stage nearly or substantially saturate the second stage amplifier. The noise figure signal-to-noise ratio is thereby of good quality since there are no significant losses at the signal input of the signal into the optical amplifier. Erbium-doped optically pumped fiber amplifiers are used for the two stages. An add/drop filter can be appended to the end of the conditioning Bragg gratings. Residual optical signal from the fiber Bragg grating may be used to optically pump another amplifier for amplifying longer wavelength optical signals.
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Guy Martin
Lauzon Jocelyn
Angelhart James
Anglehart James
Institut National D'Optique
Moskowitz Nelson
Shipkovitz Samuel
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