Optical node and optical add/drop multiplexer
AssigneeFujitsu Limited
InventorsHiroki Ooi, Takafumi Terahara, Jens Rasmussen, Akira Miura, Akihiko Isomura, Yuichi Akiyama
Life of this patent
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Abstract
The optical node connects N networks to each other (where N is an integer larger than one). Each of the N networks respectively includes a first transmission path and a second transmission path. The optical node includes a switching unit that connects the first transmission path of one network of the N networks to other (N-1) networks; a failure detector that detects failure in the first transmission path of the network; and a control unit that causes the switching unit to connect the second transmission path of the network to the other (N-1) networks when the failure is detected.
Claims12
An optical node that connects N networks to each other, where N is an integer larger than one, wherein each of the N networks respectively includes a first transmission path and a second transmission path, comprising:
- a switching unit that connects the first transmission path of one network of the N networks to other (N-1) networks;
- a failure detector that detects failure in the first transmission path of the network;
- and
- a control unit that causes the switching unit to connect the second transmission path of the network to the other (N-1) networks when the failure is detected.
An optical node that connects N networks to each other, where N is an integer larger than one, wherein each of the N networks respectively includes a working line and a protection line, comprising:
- a first switching unit that connects the working lines of the N networks to each other;
- and
- a second switching unit that connects the protection lines of the N networks to each other.
An optical add/drop multiplexer in a network that includes a plurality of transmission paths, comprising:
- a transponder that sends or receives an optical signal;
- a plurality of wavelength-selective switches that are respectively connected to the transmission paths;
- and
- a controller that connects the transponder to any one of the wavelength-selective switches via a per-channel optical switch or an optical coupler.
Dependencies are inferred from the claim text.