Optical amplifier

Details Optical amplifier Optical amplifier

H - Electricity

01

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345/12

H01S 3/06 (2006.01) H01S 3/02 (2006.01) H01S 3/063 (2006.01) H01S 3/091 (2006.01)

Patent

CA 2023244

ABSTRACT OF THE DISCLOSURE An optical waveguide having a first cross section is thinned to constitute a thinned portion having a second cross section, as long as a predetermined length. The surface of the thinned portion is contacted with a laser glass member doped with a rare earth element, such as Er. Due to the thinned diameter' the optical fiber is optically coupled with the laser glass mem- ber. A pumping light is input either into the optical waveguide together with a signal light or directly into the laser glass member. Signal light coupled from the thinned portion to the laser glass member is amplified by stimulated emission of the laser glass. The thus amplified signal light is coupled back to the thinned portion so as to propagate along the optical wave- guide. The thinned portion can be as short as several centimeters compared with ten meters to more than one hundred meters for a conventional optical amplifier. In the optical waveguide where the pumping light is directly input to the laser glass member, a complicated multiplexer is not necessary, resulting in a reliable operation of the amplifier.

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