In-fiber two-stage amplifier providing wdm signal conditioning

Details In-fiber two-stage amplifier providing wdm signal conditioning In-fiber two-stage amplifier providing wdm signal conditioning

H - Electricity

04

B

H04B 10/17 (2006.01) H04B 10/18 (2006.01) H01S 3/067 (2006.01)

Patent

CA 2234013

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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