Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2007-03-23
2010-11-02
Vanderpuye, Ken N (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S025000, C398S026000, C398S045000, C398S079000
Reexamination Certificate
active
07826748
ABSTRACT:
The present invention provides systems and methods to adaptively control amplifier target power to maintain signal launching power as per design in networks with wavelength selective switch (WSS)-based reconfigurable optical add-drop multiplexers (ROADMs) using micro-electromechanical system (MEMS). Accordingly, signal OSNR does not collapse faster for WSS-based ROADMs than other similar configured system without WSS-based ROADM. In order to correct amplifier target power, the present invention utilizes system information about side-lobe size and OSNR at each amplifier. Related information, such as ASE level and size of side-lobes at each channel from upstream amplifiers, is passed to the network controller at each amplifier. Meanwhile, with target signal level and local WSS attenuation setting (given side-lobe size vs. WSS attenuation known) of each channel, the amplifier calculates what is total output power should be and adaptively maintains that power.
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Sridhar Balakrishnan
Yang Xiaohui
Baratta Jr. Lawrence A.
Bernard Christopher L.
Ciena Corporation
Clements Bernard PLLC
Ngo Tanya
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