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 network management apparatus, comprising:
a memory configured to store wavelength selection information corresponding to a filtering process with respect to each of optical paths; and
a processor configured to set a plurality of guard bands to each of the optical paths based on the wavelength selection information.
2. The optical network management apparatus according to claim 1 , wherein the wavelength selection information depends on a number of optical nodes configured to perform the filtering process on each of the optical paths.
3. The optical network management apparatus according to claim 1 , wherein the processor is further configured to set the guard bands dynamically.
4. The optical network management apparatus according to claim 1 , wherein the setting of the guard bands includes one of changing an information signal to add a guard band and changing a bandwidth of a guard band.
5. The optical network management apparatus according to claim 1 , wherein the processor is further configured to send the wavelength selection information to an optical node on one of the optical paths.
6. The optical network management apparatus according to claim 1 , wherein the optical paths include:
a first optical path with a central wavelength equal to a first wavelength; and
a second optical path with a central wavelength equal to a second wavelength, the second wavelength lying adjacent to the first wavelength on a wavelength grid, and
wherein the processor is configured to set the guard bands of the first optical path based on wavelength selection information on the first optical path and wavelength selection information on the second optical path.
7. The optical network management apparatus according to claim 1 , wherein the processor is configured to, when setting an optical path between predetermined nodes, set the optical path, giving priority to an optical path with a smaller number of filtering processes among filtering processes available for the setting of the optical path.
8. An optical network management method, comprising:
storing wavelength selection information corresponding to a filtering process with respect to each of optical paths; and
setting a plurality of guard bands to each of the optical paths based on the wavelength selection information.
9. The optical network management method according to claim 8 , wherein the wavelength selection information depends on a number of optical nodes configured to perform the filtering process on each of the optical paths.
10. The optical network management method according to claim 8 , wherein the setting of the plurality of guard bands includes setting the guard bands dynamically.
11. The optical network management method according to claim 8 , wherein the setting of the guard bands includes one of changing an information signal to add a guard band and changing a bandwidth of a guard band.
12. The optical network management method according to claim 8 , wherein the setting of the plurality of guard bands includes sending the wavelength selection information to an optical node on one of the optical paths.
13. The optical network management method according to claim 8 , wherein the optical paths include:
a first optical path with a central wavelength equal to a first wavelength; and
a second optical path with a central wavelength equal to a second wavelength, the second wavelength lying adjacent to the first wavelength on a wavelength grid, and
wherein the setting of the plurality of guard bands includes setting the guard bands of the first optical path based on wavelength selection information on the first optical path and wavelength selection information on the second optical path.
14. The optical network management method according to claim 8 , wherein the setting of the plurality of guard bands includes, when setting an optical path between predetermined nodes, setting the optical path, giving priority to an optical path with a smaller number of filtering processes among filtering processes available for the setting of the optical path.