Optical communications – Fault recovery – Bypass inoperative element
Reexamination Certificate
2011-04-05
2011-04-05
Tran, Dzung D (Department: 2613)
Optical communications
Fault recovery
Bypass inoperative element
C398S005000, C398S019000
Reexamination Certificate
active
07920786
ABSTRACT:
A solution for detecting and recovering from a failure in a protected single-fiber passive optical network. A detector is used to detect the degradation in power level of optical signals. Furthermore, the invention discloses a variable symmetric split ratio approach to improve the number of splits (e.g. the number of ONUs). A single-fiber passive optical network is disclosed that uses a plurality of passive nodes connected in the optical fiber between the interfaces, wherein in the passive nodes 2-by-2 splitters/combiners are used to couple optical power from and into the optical fiber at a predetermined split ratio.
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Pietilainen Antti
Ye Yinghua
Schofield Technologies LLC
Tran Dzung D
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