Optical: systems and elements – Optical amplifier – Correction of deleterious effects
Reexamination Certificate
2001-09-27
2003-03-25
Moskowitz, Nelson (Department: 3663)
Optical: systems and elements
Optical amplifier
Correction of deleterious effects
C359S199200, C359S341410, C359S341420
Reexamination Certificate
active
06538803
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an optical amplifier and wavelength division multiplex light communication system.
FIG. 9
illustrates a wavelength division multiplex light communication system according to the prior art while
FIG. 10
is a graph schematically showing the relationship between the number of channels in an optical amplifier used in the wavelength division multiplex light communication system of the prior art and the total light output power.
As shown in
FIG. 9
, the wavelength division multiplex light communication system of the prior art comprises a plurality (eight in this figure) of light transmitters
1
for transmitting light signals, a multiplexer
2
for wavelength division multiplexing a plurality of channel light signals transmitted from the light transmitters
1
, a plurality of optical amplifiers
3
connected in series with one another for amplifying and translating the multiplex light signals wave division multiplexed by the multiplexer
2
, a splitter
4
for wavelength separating the amplified light signals from the optical amplifiers
3
for each channel and a plurality of light receivers
5
each for receiving each light signal wavelength separated by the splitter
4
.
In general, the optical amplifier used in the wavelength division multiplex light communication system is adapted to increase or decrease the total light output power depending on the number of channels.
SUMMARY OF THE INVENTION
The present invention provides an optical amplifier characterized by that the control is performed such that the total light output power Pt becomes equal to the maximum total light output power P
max
when the number of channels (n) is maximum (n
max
) and also such that the total light output power P
t
obtained by amplifying multiplex light signals substantially becomes
P
t
>P
max
×n
max
when the number of light signal channels n is smaller than n
max
.
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patent: 6433904 (2002-08-01), Swanson et al.
patent: 6473212 (2002-10-01), Chraplyvy et al.
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International Search Report from Application PCT/JP00/06184.
Knobbe Martens Olson & Bear LLP
Moskowitz Nelson
The Furukawa Electric Co. Ltd.
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