Optical transmission system

Details Optical transmission system Optical transmission system

2011-08-02

2011-08-02

Bolda, Eric (Department: 3663)

Optical: systems and elements

Optical amplifier

Correction of deleterious effects

C359S337110, C359S337400, C359S341410

Reexamination Certificate

active

07990608

ABSTRACT:
An optical amplifier reducing gain deviation caused by wavelength arrangement has a first-stage optical amplifying unit, an attenuator, a second-stage optical amplifying unit, an automatic gain controller controlling the first- and second-stage optical amplifying units so that a gain of signal light outputted from the second-stage optical amplifying unit to signal light inputted to the first-stage optical amplifying unit is constant, and an attenuation amount controller controlling an attenuation amount at the attenuator to adjust gain-versus-wavelength characteristic at the automatic-gain-controlled first- and second-stage optical amplifying units on the basis of information on wavelength arrangement and an input level of the signal light inputted to the first-stage optical amplifying unit so that gain slope characteristic at the first- and second-stage optical amplifying units due to the wavelength arrangement and the input level is flattened.

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