Optical communications – Fault recovery – Bypass inoperative element
Reexamination Certificate
2006-06-05
2009-12-15
Vanderpuye, Ken N (Department: 2613)
Optical communications
Fault recovery
Bypass inoperative element
C398S001000, C398S002000, C398S003000, C398S004000, C398S006000, C398S007000, C398S009000, C398S027000
Reexamination Certificate
active
07634194
ABSTRACT:
The present invention provides multi-channel protection switching systems and methods for increased reliability and reduced cost. Advantageously, the multi-channel protection switching systems and methods of the present invention use pre-FEC rate measurements, and changes in pre-FEC rate measurements, to detect and avoid potential link failures before they occur. The multi-channel protection switching systems and methods of the present invention also use “wavelength-hopping” and other protection schemes to alleviate wavelength and time-dependent optical propagation impairments. Advantageously, the multi-channel protection switching systems and methods of the present invention switch proactively on diminished, rather than failed, signals; do not require the pre-provisioning of bandwidth through an alternate physical path; allow for switching in either the electrical or optical domain; and incorporate buffering of the data sources involved such that they may be synchronized, thereby providing “hitless” switching between channel sources on the client side.
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Penninckx, et al., “WDM Redundancy to counteract PMD Effects in Optical Systems”, European Conference on Optical Communications, 2001.
S. Sarkimukka, A. Djupsjobacka, A. Gavler, and G. Jacobsen; “Mitigation of Polarization-Mode Dispersion in Optical Mutlichannel Systems”; Journal of Llghtwave Technology, vol. 18, No. 10, Oct. 2000; Stockholm, Sweden.
Denis Penninckx (1), Stephanie Lanne (1), Henning Bulow (2); WDM Reduncancy to Counteract PMD Effects in Optical Systems; (1) Alcatel Research & Innovation, Route de Nozay, F-91460 Marcoussis, France (2) Alcatel Research & Innovation, Holderacker Str. 35, D-70499, Stuttgart, Germany, European Conference on Optical Communication, 2001, ECOC '01.
Frankel Michael Y.
Sridhar Balakrishnan
Bernard Christopher L.
Brown Tyler S.
Ciena Corporation
Clements Bernard PLLC
Dobson Daniel G
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