Bidirectional WDM transmission system having transmission...

Optical communications – Interference signal transmission or elimination

Reexamination Certificate

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C398S048000

Reexamination Certificate

active

07133612

ABSTRACT:
A WDM optical transmission system is provided that operates at a plurality of channel wavelengths. The system includes at least three nodes at which any one or more of the channel wavelengths can be added or dropped. At least three optical transmission links interconnect the nodes. Each link includes a single waveguide over which travel oppositely-directed WDM signals having channel wavelengths that are interleaved with one another in a pairwise manner. A majority of the optical transmission links each have an optical span loss that corresponds to a level of coherent crosstalk between a reflected channel at a given wavelength co-propagating with a channel at the given wavelength prior to isolating one of the adjacent channels in a node that is less than a level of coherent crosstalk that would otherwise arise if a unidirectional transmission format were employed over a single waveguide in the same system.

REFERENCES:
patent: 5633741 (1997-05-01), Giles
patent: 6243177 (2001-06-01), Duerksen
patent: 2002/0105692 (2002-08-01), Lauder et al.
patent: 2003/0063349 (2003-04-01), Peeters et al.
U.S. Appl. No. 09/571,833, filed May 16, 2000, Wagener et al.
U.S. Appl. No. 09/691,812, filed Oct. 19, 2000, Wagener et al.

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