Method and apparatus for controlling optical amplifier used for

Details Method and apparatus for controlling optical amplifier used for Method and apparatus for controlling optical amplifier used for

1996-08-21

1998-04-28

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

H01S 300

Patent

active

057452830

ABSTRACT:
A method and apparatus for controlling gain differences between optical signals, and hence an output of each individual optical signal, in an optical amplifier including a rare-earth-doped fiber for optically amplifying a wavelength-division multiplexed signal. Pumping light is injected into an erbium-doped fiber that is also supplied with additional pumping light that gives a different gain characteristic to the erbium-doped fiber. The output of each signal light is detected by a photodetector and, based on the detected output, injection power is controlled individually for each pumping light.

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U.S. application No. 08/508,471, Fujitsu Limited, filed Jul. 28, 1995.
Delavaux et al., "Hybrid Er-Doped Fibre Amplifiers at 980-1480 nm for Long Distance Optical Communications," Electronics Letters, vol. 28, No. 17, Aug. 13, 1992, XP 000315887, 2 pages.
Motoshima et al., "Dynamic Compensation of Transient Gain Saturation in Erbium-Doped Fiber Amplifiers by Pump Feedback Control," IEEE Photonics Technology Letters, vol. 5, No. 12, Dec. 1993, XP 000432990, pp. 1423-1426.
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