Optical fiber amplifier/multiplexer

Details Optical fiber amplifier/multiplexer Optical fiber amplifier/multiplexer

1990-08-15

1991-04-16

Healy, Brian

Coherent light generators

Particular component circuitry

Optical pumping

350 9612, 350 9616, 350 9629, 350 9634, 372 6, 370 1, 370 3, G02B 626, H01S 330, H04J 100

Patent

active

050076981

ABSTRACT:
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. 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 member. A pumping light is input to 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. Thus amplified signal light is coupled back to the thinned portion so as to propagate along the optical waveguide. The thinned portion can be as short as several centi-meters compared with ten meters to more than one hundred meters of conventional optical amplifier. In the optical waveguide where the pumping light is directly input to the laser glass member, the complicated multiplexer is not necessary, resulting in a reliable operation of the amplifier.

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patent: 4805977 (1989-02-01), Tamura et al.
patent: 4820010 (1989-04-01), Scifres et al.
patent: 4852117 (1989-07-01), Po
patent: 4867518 (1989-09-01), Stamnitz et al.
patent: 4938561 (1990-07-01), Grasso et al.
patent: 4941726 (1990-07-01), Russell et al.

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