Method and apparatus for in-service upgrading of OADM to...

Details Method and apparatus for in-service upgrading of OADM to... Method and apparatus for in-service upgrading of OADM to...

2004-06-17

2008-03-11

Vanderpuye, Kenneth (Department: 2613)

Optical communications

Multiplex

Wavelength division or frequency division

C398S045000, C398S048000, C398S049000, C398S050000, C398S082000

Reexamination Certificate

active

07343096

ABSTRACT:
System and methods for upgrading an optical add-drop multiplexer (OADM) to higher degree wavelength selective router (WSR)/wavelength selective switch (WSS) are disclosed. For example, an OADM of degree-2 may be provisioned for upgrades to degree-3 and higher. The existing links power and signal-to-noise (SNR) budgets are not significantly affected when the node is upgraded to a higher degree WSS/WSR. Cascaded power dividers and combiners may be used in conjunction with optical amplifiers and reconfigurable blocking filters to increase the number of paths over which an optical signal can be routed/switched without affecting the paths already utilized. Prior to enabling service on either an input or output fiber, taps and combiners are pre-provisioned so as to ensure that at least one additional transmission path is always available.

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