Optical communications – Fault recovery – Bypass inoperative element
Reexamination Certificate
2007-11-27
2007-11-27
Sedighian, M. R. (Department: 2613)
Optical communications
Fault recovery
Bypass inoperative element
C398S003000, C398S004000, C398S148000, C398S159000
Reexamination Certificate
active
10853864
ABSTRACT:
A medium-scale IP telecommunications network is configured in a low-cost optical network with good reliability and expandability. A physical configuration example has a center node2-1and eight local nodes2-11through2-18connected in one OADM ring2-21/2-22. The logical configuration is a star configuration with the central node2-1at its origin with all traffic passing through the center node2-1. The local nodes2-11through2-18are connected to the central node2-1by wavelength-unit optical channels or optical paths λ1through λ8. Channels are added as required. Initially, for example, the center node2-1and the local node2-5are connected by λ5, but λ13can added when the need arises. Since the logical star network is limited to approximately two add/drop optical channels at local nodes, costs are reduced by using inexpensive filters (e.g., dielectric interference film filters or fiber Bragg reflectors) that are capable of extracting only the specific wavelength of the optical channel. High reliability is provided through the use of optical switches for correction of fiber transmission path failures.
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Ikoma Yoshiaki
Sakano Shinji
Sawada Yasushi
Tsushima Hideaki
Hitachi Ltd
Knoble & Yoshida & Dunleavy LLC
Sedighian M. R.
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