Optical network management apparatus and method of allocating optical frequency band
It is difficult to improve the usage efficiency of an optical communication network due to the passband narrowing effect in a wavelength selection process in an optical communication network using a wavelength division multiplexing system; therefore, an optical network management apparatus according to an exemplary aspect of the present invention includes wavelength selection information generating means for generating wavelength selection information on a wavelength selection process through which an optical path accommodating an information signal goes, with respect to each optical path; and wavelength selection information notifying means for notifying an optical node device through which the optical path goes of the wavelength selection information.
1. An optical node device comprising:
an optical filter configured to operate with respect to each optical path, based on wavelength selection information related to a filtering process; and
a controller configured to set, for the optical filter, a passband including a guard band set with respect to each optical path, based on the wavelength selection information.
2. The optical node device according to claim 1 , wherein the wavelength selection information includes a number of optical nodes which perform the filtering process in each optical path.
3. The optical node device according to claim 1 , wherein the controller is configured to set the guard band dynamically.
4. The optical node device according to claim 1 , wherein the setting of the guard band includes changing an information signal to which the guard band is added and changing a width of the guard band.
5. The optical node device according to claim 1 , further comprising a receiver configured to receive the wavelength selection information,
wherein the controller is configured to set the passband based on received wavelength selection information if an optical path goes through the optical node device.
6. The optical node device according to claim 5 , wherein the receiver is configured to, if there are a first optical path with a center wavelength equal to a first wavelength and a second optical path with a center wavelength equal to a second wavelength lying next to the first wavelength on a wavelength grid, receive wavelength selection information in which a guard band of the first optical path is set based on both wavelength selection information of the first optical path and wavelength selection information of the second optical path.
7. The optical node device according to claim 5 , wherein the receiver is configured to, if an optical path is set between predetermined optical node devices, receive wavelength selection information related to a process which is preferentially performed on an optical path in an order of a number of filtering processes from smallest to largest, among available filtering processes in the optical path setting.
8. A method for an optical node comprising:
filtering with respect to each optical path, based on wavelength selection information related to filtering process; and
setting, for the filtering, a passband including a guard band set with respect to each optical path, based on the wavelength selection information.
9. The method according to claim 8 , wherein the wavelength selection information includes a number of optical nodes which perform the filtering process in each optical path.
10. The method according to claim 8 , wherein the setting of the passband includes setting the guard band dynamically.
11. The method according to claim 8 , wherein the setting of the guard band includes changing an information signal to which the guard band is added and changing a width of the guard band.
12. The method according to claim 8 , further comprising receiving the wavelength selection information,
wherein the setting of the passband includes setting the passband based on received wavelength selection information if an optical path goes through the optical node.
13. The method according to claim 12 , wherein the receiving of the wavelength selection information includes, if there are a first optical path with a center wavelength equal to a first wavelength and a second optical path with a center wavelength equal to a second wavelength lying next to the first wavelength on a wavelength grid, receiving wavelength selection information in which a guard band of the first optical path is set based on both wavelength selection information of the first optical path and wavelength selection information of the second optical path.
14. The method according to claim 12 , wherein the receiving of the wavelength selection information includes, if an optical path is set between predetermined optical nodes, receiving wavelength selection information related to a process which is preferentially performed on an optical path in an order of a number of filtering processes from smallest to largest, among available filtering processes in the optical path setting.