Network design apparatus, network design method, and storage medium
AssigneeFujitsu Limited
InventorTaizo Maeda
Life of this patent
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Abstract
A network design method includes calculating, from the number of wavelength filters on a transmission route of an optical signal, a bandwidth of the optical signal after narrowing by the wavelength filters, selecting, from a plurality of combinations of a multi-level modulation system and a baud rate about the optical signal set in a transmitting apparatus, one or more first combinations about which a lower-limit value of the bandwidth of the optical signal in each of the combinations is equal to or smaller than the bandwidth of the optical signal after narrowing, and selecting a second combination from the one or more first combinations based on a minimum value of an OSRN of the optical signal in the selected combinations.
Claims8
A network design apparatus comprising:
- a memory configured to store a correspondence relationship between a plurality of combinations of a multi-level modulation system and a baud rate about an optical signal set in a transmitting apparatus that transmits and receives the optical signal and a lower-limit value of a bandwidth and a minimum value of an optical signal-to-noise ratio about the optical signal for keeping given quality of the optical signal when the multi-level modulation system and the baud rate are set in the transmitting apparatus;
- and
- a processor coupled to the memory and configured to:
- calculate, from a number of wavelength filters on a transmission route of the optical signal, the bandwidth of the optical signal after narrowing by the wavelength filters, and
- select one or more first combinations about which the lower-limit value of the bandwidth is equal to or smaller than the bandwidth of the optical signal after narrowing from the plurality of combinations and select a second combination about which the minimum value of the optical signal-to-noise ratio is smallest from the one or more first combinations.
A network design method comprising:
- calculating, from a number of wavelength filters on a transmission route of an optical signal, a bandwidth of the optical signal after narrowing by the wavelength filters;
- selecting, from a plurality of combinations of a multi-level modulation system and a baud rate about the optical signal set in a transmitting apparatus, one or more first combinations about which a lower-limit value of the bandwidth of the optical signal for keeping given quality of the optical signal in each of the combinations is equal to or smaller than the bandwidth of the optical signal after narrowing;
- and
- selecting a second combination about which a minimum value of optical signal-to-noise ratio for keeping given quality of the optical signal is smallest from the one or more first combinations.
A non-transitory computer-readable storage medium storing a program that causes a processor included in a network design apparatus to execute a process, the process comprising:
- calculating, from a number of wavelength filters on a transmission route of an optical signal, a bandwidth of the optical signal after narrowing by the wavelength filters;
- selecting, from a plurality of combinations of a multi-level modulation system and a baud rate about the optical signal set in a transmitting apparatus, one or more first combinations about which a lower-limit value of the bandwidth of the optical signal for keeping given quality of the optical signal in each of the combinations is equal to or smaller than the bandwidth of the optical signal after narrowing;
- and
- selecting a second combination about which a minimum value of optical signal-to-noise ratio for keeping given quality of the optical signal is smallest from the one or more first combinations.
Dependencies are inferred from the claim text.