Light transmission device, optical relay device, optical wavelength multiplexing transmission appratus, optical switch, and light transmission method
AssigneeFujitsu Limited
InventorKazuaki Nagamine
Life of this patent
Estimating the term…
Abstract
A relay station has an optical switch that switches a reception path of an optical signal. The relay station generates a subsignal that has a wavelength different from the wavelength of a data signal corresponding to a signal to be transmitted and transmits an optical signal obtained by multiplexing the generated subsignal and the data signal. In this state, when the data signal is not included in the received optical signal, the relay station determines whether the subsignal is included in the optical signal. When it is determined that the subsignal is included, the relay station maintains a connection path of the optical switch without switching the connection path.
Claims15
A light transmission device, comprising:
- a subsignal generator circuit that generates a subsignal having the wavelength different from the wavelength of a data signal corresponding to a signal to be transmitted;
- a signal transmitter that transmits an optical signal where the subsignal generated by the subsignal generator circuit and the data signal are multiplexed;
- an optical switch that switches a reception path of the optical signal;
- a subsignal determiner circuit that determines whether the subsignal is included in the received optical signal, when the data signal is not included in the received optical signal;
- and
- a switch control processor that maintains a connection path of the optical switch without switching the connection path, when it is determined by the subsignal determiner circuit that the subsignal is included.
An optical relay device, comprising:
- a subsignal generator circuit that generates a subsignal having the wavelength different from the wavelength of a data signal corresponding to a signal to be transmitted;
- and
- a signal transmitter that transmits an optical signal where the subsignal generated by the subsignal generator circuit and the data signal are multiplexed.
An optical wavelength multiplexing transmission apparatus, comprising:
- a subsignal generator circuit that generates a subsignal having the wavelength different from the wavelength of each of a plurality of data signals, which correspond to a signal to be transmitted and have the different wavelengths;
- a signal transmitter that multiplexes the plurality of data signals having the different wavelengths and transmits an optical signal where a multiplexed signal and the subsignal generated by the subsignal generator circuit are multiplexed;
- a demultiplexer that receives the optical signal and demultiplexes the plurality of data signals and the subsignal from the optical signal;
- a plurality of optical switches that switch reception paths of the plurality of data signals, respectively;
- and
- a switch control processor that maintains a connection path of the optical switch without switching the connection path, when the subsignal is demultiplexed from the optical signal by the demultiplexer.
An optical switch, comprising:
- a subsignal determiner circuit that determines whether a subsignal having the wavelength different from the wavelength of a data signal to be transmitted is included in a received optical signal, when the data signal is not included in the received optical signal;
- and
- a switch control processor that maintains a current connection path without switching the connection path, when it is determined by the subsignal determiner circuit that the subsignal is included in the optical signal.
A light transmission method comprising:
- generating a subsignal having the wavelength different from the wavelength of a data signal corresponding to a signal to be transmitted;
- transmitting an optical signal where the subsignal and the data signal are multiplexed;
- determining whether the subsignal is included in the received optical signal, when the data signal is not included in the received optical signal;
- and
- maintaining a reception path of the optical signals without switching the reception path, when it is determined that the subsignal is included.
An optical relay method comprising:
- generating a subsignal having the wavelength different from the wavelength of a data signal corresponding to a signal to be transmitted;
- and
- transmitting an optical signal where the subsignal and the data signal are multiplexed.
An optical wavelength multiplexing transmission method comprising:
- generating a subsignal having the wavelength different from the wavelength of each of a plurality of data signals, which correspond to a signal to be transmitted and have the different wavelengths;
- multiplexing the plurality of data signals having the different wavelengths and transmitting an optical signal where a multiplexed signal and the generated subsignal are multiplexed;
- receiving the optical signal and demultiplexing the plurality of data signals and the subsignal from the optical signal;
- and
- maintaining a reception path of each of the plurality of data signals without switching the reception path, when the subsignal is demultiplexed from the optical signal.
Dependencies are inferred from the claim text.