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Mechanism for the determination of power and optical signal-to-noise-ratio values in a DWDM system by using noise suppression Disclosure Number: IPCOM000018273D
Original Publication Date: 2002-Apr-01
Included in the Prior Art Database: 2003-Jul-23

Publishing Venue


Related People

Bernhard Kessler Simone Ebert Alvaro Carvalho [+details]


The procedure for calculation of the optical signal-to- noise ratio (OSNR) and the signal power values in optical spectrum analysers (OSA) was not accurate enough for the demands of the development and integration of TransXpress Infinity systems. Espe- cially for the control and adjustment of the optical link, the OSNR and power values have to be adjusted with least possible errors to ensure optimum optical performance. For the OSNR calculation, the determi- nation of the spectrum's noise floor is necessary. The recently designed WDM systems have a small channel grid and are loaded with high bitrate signals. So the available noise floor between two peaks is very small. The minimum between two speaks can be a solution for a point of the optical noise floor. On the other hand the WDM aren't always full loaded or evenly distributed. If there is a large distance be- tween two peaks and the noise floor isn't flat, the determining of the minimum won't give enough ac- curacy. In this case the better solution is to determine the noise floor at a fix distance from the middle of the peak. But this distance depends on the dynamic characteristics of the OSA. See also item 2.)