Optical amplifier

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H01S 3/06 (2006.01) H01S 3/067 (2006.01) H01S 3/083 (2006.01) H01S 3/16 (2006.01) H01S 3/23 (2006.01) H01S 3/094 (2006.01) H01S 3/131 (2006.01)

Patent

CA 1253943

ABSTRACT OF THE DISCLOSURE An optical amplifier particularly suitable for use in amplifying signals carried on optical fiber in a select communication band. The amplifier comprises a resonant optical waveguide cavity which has a core con- taining an active gain material with given absorption and fluorescence spectrums. The gain material is of the type that preferably has at least two different emission bands originating from the same energy level with one of the emission bands encompassing the select communication band. The cavity is structured to resonate wavelengths in both emission bands, but with a higher combination of cavity Q and gain coefficient per excited ion for wave- lengths in the emission band not corresponding to the select communication band so that, when pumped, the cavity first lases at this band. The lasing action causes the atomic population of the gain material corre- sponding to the communication band to remain at a stable constant level where it is available to uniformly amplify by stimulated emission optical signals introduced into the cavity.

522190

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