Optical frequency division multiplexing network
AssigneeHitachi, Ltd.
InventorsAtsushi Takai, Ryoji Takeyari, Akihiko Takase
Life of this patent
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Abstract
An optical frequency division multiplexing network includes first optical communication paths connected to terminals, respectively, a second optical communication path connected to the outside and a node composed of a selection unit for selecting signals having optical frequencies to be sent to the plurality of terminals, respectively, from signals transmitted through the second optical communication path in optical frequency division multiplexing, a conversion unit for converting the selected signals into signals having a single optical frequency and an output unit for producing the converted signals to the terminals through the first optical communication paths, respectively.
Claims6
A method of transmitting optical signals to terminals comprising the steps of:
- receiving first optical signals in optical frequency division multiplexing fashion through an optical communication path;
- demultiplexing said first optical signals in optical frequency division multiplexing fashion to second optical signals having a first common optical frequency which is independent of the optical frequencies of said first optical signals;
- and
- distributing said second optical signals having the first common optical frequency to the corresponding terminals.
A method of transmitting optical signals to an optical communication path comprising the steps of:
- receiving first optical signals having a common optical frequency from terminals;
- multiplexing said first optical signals having the common optical frequency to second optical signals in an optical frequency division multiplexing fashion, the common optical frequency being independent of the optical frequencies of said second optical signals;
- and
- sending said second optical signals in optical frequency division multiplexing fashion to said optical communication path.
Dependencies are inferred from the claim text.