Optical amplifiers

Details Optical amplifiers Optical amplifiers

2007-05-29

2007-05-29

Hughes, Deandra M. (Department: 3663)

Optical: systems and elements

Optical amplifier

Correction of deleterious effects

Reexamination Certificate

active

11142549

ABSTRACT:
A multichannel optical amplifier having an adjustable gain set point is controlled to permit substantially constant gain tilt control during a gain set-point change so that the channel powers are maintained during system modification. To this end the amplifier comprises an erbium doped fibre (EDF) loop and associated pump amplifier for amplifying an optical signal comprising channels of different wavelengths, a variable optical attenuator (VOA) for controlling the gain of the amplifier by applying a loss profile that varies with wavelength so that the different channels are amplified in accordance with a required gain tilt, preferably a zero gain tilt, and a PI controller for applying a gain tilt adaptation profile to compensate for an inherent gain tilt to produce the required gain tilt. Furthermore the PI controller is arranged to change the gain tilt adaptation profile in response to a change in the gain set point to allow for the different gain characteristics of the amplifier at different gain set points.

REFERENCES:
patent: 6535330 (2003-03-01), Lelic et al.
patent: 6687045 (2004-02-01), Lelic
patent: 6856454 (2005-02-01), Pavel et al.
patent: 2002/0071173 (2002-06-01), Lee et al.
patent: 2002/0141044 (2002-10-01), Sugawara et al.
patent: 2003/0048525 (2003-03-01), Irie
patent: 2004/0051938 (2004-03-01), Chan et al.
patent: 2004/0075888 (2004-04-01), Eselt
UK Search Report for corresponding Application No. 0425907.3 dated Feb. 16, 2005.

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