Reconfigurable optical node with distributed spectral filtering

Details Reconfigurable optical node with distributed spectral filtering Reconfigurable optical node with distributed spectral filtering

2006-09-19

2006-09-19

Font, Frank G. (Department: 2883)

Optical waveguides

With optical coupler

Plural

C385S014000, C385S039000, C398S043000, C398S045000, C398S048000, C398S079000, C398S082000, C398S083000, C398S085000

Reexamination Certificate

active

07110638

ABSTRACT:
An architecture is proposed for an optical node in a wavelength division multiplexed network. The optical node may be an optical add/drop node. Conventional add/drop nodes utilize a broadcast or blocking architecture. In a broadcast architecture, a copy of an optical signal is dropped to a drop path of a node while another copy continues on a through path. Thus, channels that occupy a specific portion of wavelengths (or spectrum) prior to the node are not available for use subsequent to the add/drop connectivity. In a blocking architecture, at least the through path (and often the drop path) is spectrally filtered. This permits wavelength reuse for add/drops in subsequent portions of the network. Disclosed is an optical node architecture that enables starting with a low cost approach, such as broadcast, but includes connections to permit ‘in-service’ upgrade to more capable architecture. Increasing spectral reuse is enabled through the architecture.

REFERENCES:
patent: 2002/0101636 (2002-08-01), Xiao et al.
patent: 2003/0184843 (2003-10-01), Moon et al.

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