Optical amplifier

Details Optical amplifier Optical amplifier

2006-08-01

2006-08-01

Hellner, Mark (Department: 3663)

Optical: systems and elements

Optical amplifier

Correction of deleterious effects

C359S337400

Reexamination Certificate

active

07085043

ABSTRACT:
An optical amplifier of the invention comprises first and second optical amplification sections connected in a cascade manner between an input terminal and an output terminal. Optical isolators which block C-band ASE travelling in an opposite direction to L-band signal light, are inserted on the amplification medium of each of the optical amplification sections. A constant gain control section calculates the number of wavelengths based on the input power of signal light, and controls the pumping light power of each optical amplification section at a constant slope with respect to the number of wavelengths, so that the respective gains in the optical amplification sections corresponding to the number of wavelengths each become constant. As a result, it is possible to maintain flat gain wavelength characteristics even when receiving input of WDM light where the number of wavelengths varies rapidly over a wide range.

REFERENCES:
patent: 6359726 (2002-03-01), Onaka et al.
patent: 6671085 (2003-12-01), So et al.
patent: 05-003356 (1993-01-01), None
patent: 07-202306 (1995-08-01), None
patent: 08-248455 (1996-09-01), None
Cechan Tian et al., “Analysis and Control of Transient Dynamics of EDFA Pumped by 1480-and 980-nm Lasers,”Journal of Lightwave Technology,vol. 21, No. 8, Aug. 2003, pp. 1728-1734.
Cechan Tian et al., “Novel Solution for Transient Control of WDM Amplifiers Using the Combination of Electrical Feedforward and Feedback,”CLEO,2002, p. 430.

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