Erbium doped fiber amplifier for reducing transient...

Details Erbium doped fiber amplifier for reducing transient... Erbium doped fiber amplifier for reducing transient...

2006-11-07

2006-11-07

Hellner, Mark (Department: 3663)

Optical: systems and elements

Optical amplifier

Correction of deleterious effects

Reexamination Certificate

active

07133196

ABSTRACT:
Provided is an erbium-doped fiber amplifier reducing transient phenomena of a signal-to-noise ratio and a bit error rate in a dynamic wavelength division multiplexing system and an amplifying method using the erbium-doped fiber amplifier. The erbium-doped fiber amplifier includes: a polarization scrambler modulating a polarization state of an input signal to remove a polarization of the input signal; an amplifier amplifying the input signal from which the polarization has been removed; a detector reading powers of input and output signals of the amplifier; and an automatic gain controller controlling currents of the pump LDs according to the powers of the input and output signals read by the detector1630to maintain the gain even if the power of input signal changes.

REFERENCES:
patent: 6353496 (2002-03-01), Jung et al.
patent: 6888670 (2005-05-01), Oh et al.
patent: 2000162547 (2000-06-01), None
Kuniaki Motoshima, et al., “A Channel-Number Insensitive Erbium-Doped Fiber Amplifier With Automatic Gain and Power Regulation Function”, Journal of Lightwave Technology, vol. 19, No. 11, Nov. 2001 (pp. 1759-1767).

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