Optical amplifier apparatus

Details Optical amplifier apparatus Optical amplifier apparatus

1995-04-18

1996-08-13

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

Optical fiber

359187, 372 38, G02F 139, H04B 1006, H01S 306

Patent

active

055462219

ABSTRACT:
An optical amplifier apparatus using an optical amplifying fiber including a working laser and a stand-by laser for firing pumping light to the optical amplifying fiber through an optical coupler, a signal light monitor unit which splits off part of the output signal light of the optical amplifying fiber by the optical coupler and monitors the same, a drive current monitor unit which monitors the drive current of the working laser, and a supervisory unit which judges that the working laser has deteriorated or there is a fault in the driver circuit of the working laser and switches from the working laser to the stand-by laser to generate the pumping light when the monitor output signal of the drive current monitor unit rises or falls beyond a predetermined range and the monitor output signal of the signal light monitor unit falls below a predetermined value. The level of the output signal light is also referred to in judging the deterioration of the laser for generating the pumping light.

REFERENCES:
patent: 4716569 (1987-12-01), Bees
patent: 4886334 (1989-12-01), Oaki
patent: 5054876 (1991-10-01), Grosso et al.
patent: 5138621 (1992-08-01), Goto et al.
patent: 5268786 (1993-12-01), Matsushita et al.

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