Optical packet switching system, optical packet switching device, and optical packet transmitter device
An optical packet switching device is provided with: a first input unit and a second input unit for receiving optical packet signals having destination information and information of a wavelength in use; an optical switch unit for routing the optical packet signals; a branching unit for branching the received optical packet signals; an analyzer unit for analyzing the header of the branched optical packet signals so as to detect the destination information and the information of the wavelength in use; and an output competition determination unit for checking for temporal competition of the optical packet signals based on the destination information and for determining whether the optical packet signals should be transmitted or discarded based on the information of the wavelength in use when there is competition.
1. An optical packet switching system comprising:
an optical packet transmitter device including a packet-length detection unit configured to detect the packet length of a received client signal,
a setting unit configured to set, according to the packet length, a number of divisions by which the client signal is divided and a wavelength used for an optical packet signal to be transmitted,
a header generation unit configured to generate a header containing information of a wavelength in use and destination information of the client signal,
a transmission processing unit configured to divide the client signal according to the set number of divisions and generate a plurality of packet signals,
a header insertion unit configured to insert the generated header in at least one packet signal, and
an electrical/optical converter unit configured to convert the plurality of packet signals into optical packet signals of a plurality of wavelengths according to the set wavelength in use; and
an optical packet switching device including a plurality of receiver units configured to receive optical packet signals in which the optical packet signals of a plurality of wavelengths are wavelength-multiplexed,
a branching unit configured to branch the received wavelength-multiplexed optical packet signals into optical packet signals of wavelengths with the header,
an optical switch unit configured to route the wavelength-multiplexed optical packet signals,
an analyzer unit configured to analyze the header of the branched optical packet signals so as to detect the destination information and the information of the wavelength in use, and
an output competition determination unit configured to check for temporal competition of the plurality of wavelength-multiplexed optical packet signals input to the plurality of receiver units based on the destination information and to determine whether the wavelength-multiplexed optical packet signals should be transmitted or discarded based on the information of the wavelength in use when there is competition.
2. The optical packet switching system according to claim 1 , wherein, even when there is temporal competition in the plurality of optical packet signals, the output competition determination unit allows the plurality of wavelength-multiplexed optical packet signals to be transmitted altogether if no competition has occurred with regard to wavelengths.
3. The optical packet switching system according to claim 1 , wherein the setting unit sets the number of divisions by which the client signal is divided and the corresponding number of wavelengths in use to a first predetermined value and sets the wavelengths in use to be a predetermined first wavelength group when the packet length is less than a predetermined length, and wherein the setting unit sets the number of divisions and the number of wavelengths in use to be a second predetermined value, which is larger than the first predetermined value, and sets the wavelengths in use to a predetermined second wavelength group when the packet length is at least the predetermined length.
4. The optical packet switching system according to claim 3 , wherein the first wavelength group and the second wavelength group have different wavelength allocation.
5. The optical packet switching system according to claim 3 comprising a plurality of the optical packet transmitter devices as nodes, wherein
the wavelength allocation of the first wavelength group is different on a node-by-node basis.
6. The optical packet switching system according to claim 1 further comprising a table associating a packet length and a wavelength group.
7. An optical packet switching device comprising:
a plurality of receiver units configured to receive optical packet signals in which the optical packet signals of a plurality of wavelengths are wavelength-multiplexed, the optical packet signals having destination information and information of a wavelength in use;
a branching unit configured to branch the received wavelength-multiplexed optical packet signals into optical packet signals of wavelengths with the header;
an optical switch unit configured to route the wavelength-multiplexed optical packet signals;
an analyzer unit configured to analyze the header of the branched optical packet signals so as to detect the destination information and the information of the wavelength in use; and
an output competition determination unit configured to check for temporal competition of the plurality of wavelength-multiplexed optical packet signals input to the plurality of receiver units based on the destination information and to determine whether the wavelength-multiplexed optical packet signals should be transmitted or discarded based on the information of the wavelength in use when there is competition.
8. The optical packet switching device according to claim 7 , wherein, even when there is temporal competition in the plurality of optical packet signals, the output competition determination unit allows the plurality of wavelength-multiplexed optical packet signals to be transmitted altogether if no competition has occurred with regard to wavelengths.
9. An optical packet transmitter device for use in an optical packet switching system comprising:
a packet-length detection unit configured to detect the packet length of a received client signal;
a setting unit configured to set, according to the packet length, a number of divisions by which the client signal is divided and a wavelength used for an optical packet signal to be transmitted;
a header generation unit configured to generate a header containing information of a wavelength in use and destination information of the client signal;
a transmission processing unit configured to divide the client signal according to the set number of divisions and generate a plurality of packet signals;
a header insertion unit configured to insert the generated header in at least one packet signal; and
an electrical/optical converter unit configured to convert the plurality of packet signals into optical packet signals of a plurality of wavelengths according to the set wavelength in use.
10. The optical packet transmitter device according to claim 9 , wherein the setting unit sets the number of divisions by which the client signal is divided and the corresponding number of wavelengths in use to a first predetermined value and sets the wavelengths in use to be a predetermined first wavelength group when the packet length is less than a predetermined length, and wherein the setting unit sets the number of divisions and the number of wavelengths in use to be a second predetermined value, which is larger than the first predetermined value, and sets the wavelengths in use to a predetermined second wavelength group when the packet length is at least the predetermined length.
11. The optical packet transmitter device according to claim 10 , wherein the first wavelength group and the second wavelength group have different wavelength allocation.