Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2005-06-07
2005-06-07
Sedighian, M. R. (Department: 2633)
Optical communications
Multiplex
Wavelength division or frequency division
C398S038000
Reexamination Certificate
active
06904241
ABSTRACT:
To improve a power balance of an optical add multiplexer, an add amplifier is optically coupled to an add path of an optical add module. A through loss associated with a signal passing through the add module, and an add loss associated with a signal travelling an add path of the add module are known or otherwise calibrated values. An input power measurement of the signal input to the add module is used in conjunction with the through loss, add loss, and number of added channels to determine an add path amplification value. The gain of the add amplifier is controlled according to add path amplification value so that the power level of added channel(s) substantially matches the power level of the WDM signal output from the add multiplexer. Furthermore, the gain profile of the add amplifier preferably matches a gain profile of a signal input to the add module. In this way, the power level and gain profile of the added channel(s) can be controlled to match the power level and gain profile of the signal passing through the add module. These same techniques may also be applied to an optical add/drop multiplexer that not dropping any channels but is adding at least one channel.
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DeGrange, Jr. James E.
Sridhar Balakrishnan
Cammarata Michael R.
CIENA Corporation
Payne David C.
Sedighian M. R.
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