IN-BAND NOISE DETERMINATION ON OPTICAL COMMUNICATION SIGNALS

摘要

There are provided methods and devices for determining a quality parameter characterizing an optical communication signal, the methods being performed by signal detection devices. At the transmitting end, there are obtained a signal power P1 of a first optical signal, a signal power P2 of a second optical signal, a signal power P3 of a third optical signal, optionally a signal power P4 of a fourth optical signal, and a total signal power Ps of a channel where the first, second, third and optional fourth optical signals are located. At a detection point, there are further obtained a signal power P1′ of the first optical signal, a signal power P2′ of the second optical signal, a signal power P3′ of the third optical signal and optionally a signal power P4′ of the fourth optical signal. There are then determined a signal deformation factor SDF and/or an optical signal to ASE noise ratio OSNR from the obtained signal powers.

主权项

1. A method for determining a quality parameter characterizing an optical communication signal, the method performed by a signal detection device and comprising:
obtaining a signal power P1 of a first optical signal at a transmitter end, a signal power P2 of a second optical signal at a transmitter end, a signal power P3 of a third optical signal at a transmitter end, and a total signal power PS of a channel where the first optical signal, the second optical signal and the third optical signal are located; obtaining a ratio K1 of the signal power P1 to the total signal power PS and a ratio K2 of the signal power P2 to the signal power P1 and a ratio K3 of the signal power P3 to the signal power P1 according to P1, P2, P3 and PS; obtaining a signal power P1′ of the first optical signal at a detection point, a signal power P2′ of the second optical signal at the detection point and a signal power P3′ of the third optical signal at the detection point; obtaining a ratio K2′ of the signal power P2′ to the signal power P1′ and a ratio K3′ of the signal power P3′ to the signal power P1′ according to P1′, P2′ and P3′; determining an extended signal to noise ratio eOSNR2 according to the recorded ratios K1, K2 and K2′ and an extended signal to noise ratio eOSNR3 according to the recorded ratios K1, K3 and K3′; and determining a signal deformation factor SDF from the extended signal to noise ratios eOSNR2 and eOSNR3.