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US 6,288,809 B1Granted
Optical subscriber network system
AssigneeFujitsu Limited
InventorsEisaku Touma, Takashi Sakata
Life of this patent
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AssigneeFujitsu Limited
InventorsEisaku Touma, Takashi Sakata
Estimating the term…
In an optical subscriber network system which connects plural optical network units to an optical service unit using passive optical elements through an optical transmission line, the optical transmission line is duplexed with a lower cost. The optical service unit and the optical network units each have plural transmission-reception portions the wavelengths of which are different from each other, and the inputs and outputs of the plural transmission-reception portions are multiplexed with the wavelengths (WDM) into a single optical transmission line to form a pseudo redundant communication path between the optical service unit and the optical network units. The communication which uses a certain wavelength between the optical service unit and the optical network units is active, and the communication which uses another wavelength is a standby. When the active communication has a fault, a switchover operation to the standby communication is performed. The communication path using plural wavelengths between the optical service unit and the optical network units can select either the function of “with redundancy” or “without redundancy” or “enhanced line speed”, depending on subscribers' demands.
An optical subscriber network system connecting plural optical network units to an optical service unit using an optical star coupler through an optical transmission line, the optical service unit and the optical network units each comprising;
An optical subscriber network system connecting plural optical network units to an optical service unit using an optical star coupler through an optical transmission line, the optical service unit and the optical network units each comprising plural combinations of;
Dependencies are inferred from the claim text.