Optical filtering by using an add-drop node

Details Optical filtering by using an add-drop node Optical filtering by using an add-drop node

2006-09-26

2006-09-26

Font, Frank G. (Department: 2883)

Optical waveguides

With optical coupler

Switch

C385S017000, C385S020000, C385S024000, C398S045000, C398S048000, C398S050000, C398S079000, C398S082000, C398S083000, C398S085000

Reexamination Certificate

active

07113662

ABSTRACT:
The present invention relates to a method using a node, a system comprising a node and a node for filtering signals in a wavelength division multiplexing (WDM) optical communications system, especially for re-configurably adding and dropping signals to and from an optical fibre path. The node comprising a drop filter, an add filter, a signal channel receiver, and a signal channel transmitter each being connected to a switch for signal channel relaying between said network, and signal channel dropping and adding from and to said network. The node provides low loss for relayed signals by allowing the drop filter to have a low crosstalk isolation, and provides high crosstalk isolation for dropped signal channels by connecting said receiver to the switch through an additional filter with high filtering characteristics for at least one predetermined signal channel of said signal.

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patent: 5915051 (1999-06-01), Damask et al.
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patent: 0905936 (1999-03-01), None
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patent: 1109341 (2001-06-01), None

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