Patent ID: 6507420
Filing Date: 2003-01-14
Classification: H04B

Abstract:
A method of estimating total noise power (kÂ·P&lgr;) at a specific point in a WDM-system that includes a predetermined number of amplifiers, in which system data is transmitted in channels of mutually different signal wavelengths within a specified wavelength range, said method comprising the steps of:measuring total output power (Pouttot) at said specific point in said system; filtering a wavelength power (P&lgr;) from the total output power (Pouttot) at a given measuring wavelength (&lgr;m) within the transmitted wavelength range but outside a signal wavelength; and multiplying the wavelength power (P&lgr;) by a constant (k) which gives the total noise power (kÂ·P&lgr;) at said specific point.