WDM optical communication system

Details WDM optical communication system WDM optical communication system

2005-08-23

2005-08-23

Hellner, Mark (Department: 3662)

Optical: systems and elements

Optical amplifier

Correction of deleterious effects

C359S341410

Reexamination Certificate

active

06934076

ABSTRACT:
The invention concerns a method and apparatus for controlling the signal output power of an optical amplifier (100). A target output power utilised to monitor the amplifier output power comprises the sum of th desired signal output power and an estimation of the ASE generated at this power. The estimation of ASE at any gain is made using a predetermined relationship between the gain of an amplifier and the generated amplified spontaneous emission (ASE). In a simple implementation of the invention, the relationship is approximated as a linear dependence, when it is determined by measuring the ASE generated at two different gains. The received ASE is ascertained by measuring the received output signal power and deducting this from the total received output power. A more extensive measurement of the relationship may also be conducted. The determined target output power can be used to stabilise the amplifier output.

REFERENCES:
patent: 5471334 (1995-11-01), Masuda et al.
patent: 5808785 (1998-09-01), Nakabayashi
patent: 6204959 (2001-03-01), Fujita et al.
patent: 0 594 178 (1994-04-01), None
patent: 11 112434 (1999-03-01), None
patent: 97/28584 (1997-08-01), None

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