Optical communications – Multiplex – Optical switching
Reexamination Certificate
2006-08-08
2006-08-08
Leung, Christina Y. (Department: 2633)
Optical communications
Multiplex
Optical switching
C398S056000
Reexamination Certificate
active
07088919
ABSTRACT:
A switch for optical signals, including a plurality of external inputs, a plurality of external outputs, a wavelength conversion entity and a plurality of core switching entities. Each core switching entity is associated to a respective set of at least two wavelengths. The approach is based on switching groups of at least two wavelengths in each core switching entity, while still maintaining per-wavelength switching granularity but sharing the provided capacity for wavelength conversion connections across the group. Thus, wavelength conversion resources assigned to a group of wavelengths are usable by any wavelength in that group. In this way, the blocking statistics in the node as a whole are improved with respect to a single-wavelength-plane configuration. In addition, the resulting switch is modular as it can be upgraded by adding or removing one or more switching modules as required.
REFERENCES:
patent: 2004/0153492 (2004-08-01), Cao et al.
LambdaRouter™ All Optical Switch, Lucent Technologies, Bell Labs Innovations, downloaded from www.lucent.com on Oct. 21, 2002.
Chip Technology Adopted in Optical Switches, http:/
easia.nikkeibp.com
ea/20011/comnet 152107.html, Oct. 21, 2002.
Leung Christina Y.
Nortel Networks Limited
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