Optical-fiber amplifier

Details Optical-fiber amplifier Optical-fiber amplifier

1996-03-04

1996-12-03

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

H01S 300

Patent

active

055813976

ABSTRACT:
Pumping light from two pumping light sources is supplied to an optical coupler which splits it into two output beams and supplies the beams to erbium-doped optical fibers in the forward and backward paths, respectively. To avoid the detrimental effect caused by interference that occurs when the wavelengths of the two pumping light sources coincide perfectly with each other, the two pumping light sources are activated alternately by clock signals that are 180.degree. out of phase with each other. Alternatively, optical shutters may be provided between the optical coupler and the respective pumping light source, and these optical shutters may be opened alternately. If one or other of the pumping light sources stops due to failure, the average level of the pumping light supplied to the optical fibers will drop. To compensate for this, it will be preferable to make provision so that when a fault is detected in one light source, pumping light is continuously supplied to the optical coupler from the other pumping light source.

REFERENCES:
patent: 5054876 (1991-10-01), Grasso et al.
patent: 5173957 (1992-12-01), Bergano et al.
patent: 5241414 (1993-08-01), Giles et al.
patent: 5268786 (1993-12-01), Matsushita et al.
patent: 5287216 (1994-02-01), Chirravuri et al.
patent: 5299055 (1994-03-01), Yoneyama
patent: 5343320 (1994-08-01), Anderson
patent: 5355248 (1994-10-01), Hadjifatiou

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