Reducing crosstalk in optical cross-connects by appropriate conf

Details Reducing crosstalk in optical cross-connects by appropriate conf Reducing crosstalk in optical cross-connects by appropriate conf

1996-01-16

1998-04-07

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359139, 359161, H04B 1018

Patent

active

057371032

ABSTRACT:
A method and apparatus providing reducing crosstalk in optical cross-connects by configuring unused switching elements into a common switch state. The optical cross-connect may be a 2.sup.N .times.2.sup.N cross-connect which includes a plurality of dilated 2.times.2 switches each having a number of switch elements. A group of the switch elements connected between one or more inputs and one or more outputs of the cross-connect are suitably configured to provide one or more desired optical signal paths through the cross-connect. Unused cross-connect switch elements which are not part of any desired optical signal path are configured such that any unused switch elements in a given dilated 2.times.2 switch are placed in a common cross or bar switch state. The resulting cross-connect outputs will include at most one second order crosstalk term, as compared to conventional switch configurations in which a cross-connect output may have up to N second order crosstalk terms.

REFERENCES:
patent: 550818 (1895-05-01), Netravali et al.
patent: 5124978 (1992-06-01), Chaao
patent: 5550818 (1996-08-01), Brackett et al.
H. Scott Hinton, "An Introduction to Photonic Switching Fabrics," Plenum Press, New York and London, pp. 104-107.
Krishnan Padmanabhan and Arun N. Netravali, "Dilated Networks for Photonic Switching," IEEE Transactions on Communications, vol. COM-35, No. 12, Dec. 1987, pp. 1357-1365.
G. Hugh Song and Matthew Goodman, "Asymmetrically-Dilated Cross-Connect Switches for Low-Crosstalk WDM Optical Networks," Paper ONS3.5 in Proceedings of IEEE Lasers and Electro-Optics Society 1995 Annual Meeting, Oct. 30-Nov. 2, 1995, San Francisco, CA.

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