Method and apparatus for suppressing transients in optical ampli

Details Method and apparatus for suppressing transients in optical ampli Method and apparatus for suppressing transients in optical ampli

1998-12-08

2000-12-19

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

359124, H01S 0300

Patent

active

061633992

ABSTRACT:
The invention is a transient suppression system for use with an optical amplifier having a specifiable total output optical power. The system measures the power in a filtered electronic version of WDM signals carrying information channels at both the input and the output of the amplifier. By attenuating very low-frequency and very high-frequency components of the converted optical signals, it is possible to obtain an accurate estimate of the aggregate power of the information channels without bias due to amplified spontaneous emissions or optical service channels. The output power estimate is divided by the input power estimate to give an estimate of the gain of the information channels, which is compared to a reference gain. The larger the difference, the greater the applied change in the output optical power of the amplifier. Under transient conditions, the input power estimate will change, causing a corresponding change in the estimated gain which is then used to control the specified value of the total optical gain fed to the optical amplifier. In this way, a constant signal gain can be maintained during transient conditions, such as when optical channels are added or dropped by upstream components in a WDM network.

REFERENCES:
patent: 5703711 (1997-12-01), Hamada
patent: 5923462 (1999-07-01), van der Plaats
patent: 6008935 (1999-12-01), Fujita et al.
patent: 6025947 (2000-02-01), Sugaya et al.
patent: 6038063 (2000-03-01), Tsuda et al.

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