Optical frequency division multiplexing network
AssigneeHitachi, Ltd.
InventorsAtsushi Takai, Ryoji Takeyari, Akihiko Takase
Life of this patent
Estimating the term…
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.
Claims10
A transmission apparatus connected to an optical signal transmission line, first network and second network, comprising:
- an optical frequency selection unit for selecting a first optical signal of a first optical frequency and a second optical signal of a second optical frequency among an optical frequency division multiplexed signal received from said optical signal transmission line and transmitting said selected first and second optical signals separately,
- a first optical frequency conversion unit connected to said optical frequency selection unit and said first network for converting a frequency of said first optical signal from said first optical frequency to a third optical frequency and transmitting an optical signal of said third optical frequency toward said first network,
- a second optical frequency conversion unit connected to said optical frequency selection unit and said second network for converting a frequency of said second optical signal from said second optical frequency to said third optical frequency and transmitting an optical signal of said third optical frequency toward said second network,
- wherein said first optical frequency is allotted for transmissions of signals from said optical transmission line to said first network,
- said second optical frequency is allotted for transmissions of signals from said optical transmission line to said second network, and
- said third optical frequency is allotted for transmissions of signals from said transmission apparatus to said first and second networks.
A transmission apparatus connected to an optical signal transmission line and further connected to first and second networks, comprising:
- an optical divider for dividing an optical frequency division multiplexed signal received from said optical signal transmission line Into a first optical frequency division multiplexed signal and a second optical frequency division multiplexed signal,
- a first optical frequency selection unit receiving said first optical frequency division multiplexed signal for selecting a first optical signal of a first optical frequency among said first optical frequency division multiplexed signal and transmitting said selected first optical signal,
- a second optical frequency selection unit receiving said second optical frequency division multiplexed signal for selecting a second optical signal of a
- second optical frequency among said second optical frequency division multiplexed signal and transmitting said selected second optical signal,
- a first optical frequency conversion unit connected to said first optical frequency selection unit and said first network for converting a frequency of said first optical signal from said first optical frequency to a third optical frequency and transmitting an optical signal of said third optical frequency toward said first network, and
- a second optical frequency conversion unit connected to said second optical frequency selection unit and said second network for converting a frequency of said second optical signal from said second optical frequency to said third optical frequency and transmitting an optical signal of said third optical frequency toward said second network.
Dependencies are inferred from the claim text.