Patent ID: 9722700
Date: 2017-08-01
CPC Classifications: H04B,H04J

Claim:
1. A method for transmitting signals in a wavelength division multiplexing (WDM) system, comprising: inputting a signal from a combined signal of WDM channels for the WDM system into a wavelength monitor; monitoring wavelengths of each of the combined WDM channels by the wavelength monitor; determining whether each of the combined WDM channels exhibit excess laser drift by the wavelength monitor; sending feedback to a transmitter for a WDM channel having excess laser drift; receiving the feedback and modifying the wavelength by the transmitter so that the WDM channel no longer exhibits excess laser drift; coupling the signal from the combined signal of WDM channels input into the wavelength monitor with a signal from a tunable laser of the wavelength monitor to form a coupled signal; detecting the coupled signal by a photodetector; and converting the coupled signal by a low speed analog to digital converter; wherein the monitoring of the wavelengths is performed by analyzing the coupled signal across a spectrum of wavelengths for the WDM channels in the combined signal and determining a power level of the coupled signal at a plurality of wavelength locations.