Method and apparatus for monitoring the momental wavelength of l

Details Method and apparatus for monitoring the momental wavelength of l Method and apparatus for monitoring the momental wavelength of l

1996-11-04

1998-10-06

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

Optical fiber

359194, 359337, 372 6, G01J 328, H04B 1008, H01S 300

Patent

active

058186298

ABSTRACT:
An apparatus which receives an input light having a spectrum, and determines a momental wavelength of the spectrum. The apparatus includes a decoupling unit, a weighting unit and a computation unit. The decoupling unit decouples a portion of the received input light, to provide a first signal representing the input light with the portion decoupled therefrom, and a second signal representing the decoupled portion. The weighting unit weights the second signal. The computation unit determines the momental wavelength from the power of the first signal and the power of the weighted second signal. An optical amplifier is also provided which determines the momental wavelength of an amplified light, and controls a gain tilt parameter of the optical amplifier in accordance with the determined momental wavelength, to reduce gain tilt. An optical communication system is also provided which includes a plurality of such optical amplifiers sequentially arranged along an optical transmission line.

REFERENCES:
patent: 5721635 (1998-02-01), Shigewatsu et al.
"A Remote Supervisory System Based on Subcarrier Overmodulation for Submarine Optical Amplifier Systems," Journal of Lightwave Technology, Murakama et al. vol. 14, No. 5, May 1996.

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