Linear VS Non Linear effects in optical networks

Linear VS Non Linear effects in optical networks

– linear effects is some negative effects in WDM and optical networks that cause losses and performance degradation
– examples on linear effects :

1- attenuation

2- scattering

3- chromatic dispersion

4- absorption

– non linear effects is the second type , it’s very critical in case of high optical power used

– examples of non linear effects :

1- polarization mode dispersion

2- stimulated Brillouin scattering

3- stimulated Raman scattering

4- self phase modulation

5- cross phase modulation

6- four wave mixing

the most critical type is four wave mixing it can be solved by the below :

1- select the proper wavelength spectrum and proper optical fiber type ( with predefined amount of negative slope dispersion )

2- use dispersion compensator

– Dispersion generally caused by transmitting multiple signals with multiple wavelength along single fiber

– the signals speed Will be different and signal pulse spreading on Time will be occurred

– this will lead to bit errors and signal performance degradation

– that can limit distance and capacity

types of dispersion :

1- chromatic dispersion

2- waveguide dispersion

3- material dispersion

4- polarization mode dispersion

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Source: LinkedIn

Credits: Mr. Mohamed Saeed’s Post