Patent ID: 11968033
Assignee: FUJITSU LIMITED
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An optical transmission system that transmits a WDM (wavelength division multiplexed) signal from a first optical transmission device to a second optical transmission device via an optical fiber transmission line, the optical transmission system comprising:
a first optical channel monitor that detects optical power of each wavelength channel of the WDM signal in the first optical transmission device;
a second optical channel monitor that detects optical power of each wavelength channel of the WDM signal in the second optical transmission device;
a first processor that calculates a linear SNR (signal-to-noise ratio) of each wavelength channel of the WDM signal based on the optical power of each wavelength channel detected by the second optical channel monitor;
a second processor that calculates a non-linear SNR of each wavelength channel of the WDM signal based on the optical power of each wavelength channel detected by the first optical channel monitor;
a third processor that calculates a GSNR (generalized SNR) for each wavelength channel of the WDM signal using the linear SNR calculated by the first processor and the non-linear SNR calculated by the second processor; and
a fourth processor that controls transmission power of each wavelength channel of the WDM signal transmitted from the first optical transmission device based on the GSNR of each wavelength channel calculated by the third processor.