Optical waveguides – With optical coupler – Switch
Reexamination Certificate
2005-08-02
2005-08-02
Palmer, Phan T. H. (Department: 2874)
Optical waveguides
With optical coupler
Switch
C385S024000, C398S004000
Reexamination Certificate
active
06925219
ABSTRACT:
Passive optical networks are generally built from a central office and a plurality of passive optical nodes. Over a main path, optical signals are transmitted to the nodes. When a fault, e.g. a cable break, occurs on the main path, the optical signals are transmitted to the nodes over a reserve path. When the fault has been removed, switchback to the main path is effected and the optical signals are again transmitted to the nodes over the main path. The device according to the invention is particularly characterized in that an additional optical signal is provided which is transmitted at a wavelength outside the wavelength range used for the transmission of useful optical signals over the main path, and which is used to power an electric circuit within the device which, in turn, controls a switch that switches between main path and reserve path.
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Chlamtac I et al.: “Scalable WDM network architecture based on photonic slot routing and switched delay lines” INFOCOM '97 Sixteen Annual Joint Conference of the IEEE Computer and Communications Societies. Driving the Information Revolution., Proceedings IEEE Kobe, Japan Apr. 7-11, 1997, Los Alamitos, CA, USA, IEE Comput. Soc, US, Apr. 7, 1997, pp. 769-776, XP010252079.
Alcatel
Palmer Phan T. H.
Sughrue & Mion, PLLC
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