Optical amplifiers

Details Optical amplifiers Optical amplifiers

2006-11-21

2006-11-21

Hellner, Mark (Department: 3663)

Optical: systems and elements

Optical amplifier

Correction of deleterious effects

C359S337400

Reexamination Certificate

active

07139118

ABSTRACT:
A multistage optical amplifier is controlled to compensate for the effect of amplified spontaneous emission (ASE) by a method comprising the following steps. Optical input and output signals to a first gain stage are detected, and the drive current to the first gain stage is controlled in dependence on the optical input signal to the first gain stage. Optical input and output signals to a last gain stage are detected, and the drive current to the last gain stage is controlled to maintain the output power of the last gain stage substantially constant. The effect of ASE in the first gain stage is compensated for by applying a correction factor based on the ASE of the first gain stage and the output power of the first gain stage. The drive current supplied to the first gain stage is controlled to zero in on an error signal of the general form:in-line-formulae description="In-line Formulae" end="lead"?(Total Power atB−Stage 1ASE)−(A+Stage 1 Gain)in-line-formulae description="In-line Formulae" end="tail"?where Total Power at B is the power of the output signal from the first gain stage, and A is the input signal of the first gain stage. Furthermore the drive current supplied to the last gain stage is controlled to zero in on an error signal of the general form:in-line-formulae description="In-line Formulae" end="lead"?(Total Power atE−Stage 2ASE)−(D+Stage 2 Gain)in-line-formulae description="In-line Formulae" end="tail"?where Total Power at E is the power of the output signal from the last gain stage, and D is the input signal of the last gain stage. In this method the correction factor is calibrated in the gain control mode and is subsequently applied in the power control mode, and this therefore simplifies the calibration procedure.

REFERENCES:
patent: 5600481 (1997-02-01), Nakabayashi
patent: 6008935 (1999-12-01), Fujita et al.
patent: 6151159 (2000-11-01), Michishita
patent: 6215584 (2001-04-01), Yang et al.
patent: 6337764 (2002-01-01), Yoon et al.
patent: 6525873 (2003-02-01), Gerrish et al.
patent: 6603596 (2003-08-01), Inagaki et al.
patent: 6606191 (2003-08-01), Gerrish et al.
patent: 6865016 (2005-03-01), Sugaya et al.
patent: 2002/0039226 (2002-04-01), Murakami et al.
patent: 2002/0159135 (2002-10-01), Kelkar et al.
patent: 2003/0147126 (2003-08-01), Rapp
U.K. Search Report for corresponding Application No. 0413017.5 dated Nov. 11, 2004.

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