is it possible to measure the double rayleigh backscattering?

[Joseph Jiang]

hi,everyone ,i want to know is it possible to measure the double rayleigh backscattering if i use bidirectional fiber_optic.thank you!

[Alessandro Festa]

That’s an interesting question…maybe you need to use iterations set to 2 to do that? I would wait for Damien to answer…

[Damian Marek]

Yes, from the technical background of the component multiple Rayleigh back-scattering is modeled. At each step along the fiber, the contribution of backscattered light from the forward travelling signal is added to the backward travelling signal and vice versa.

Regards

[Joseph Jiang]

damian,thank you for your answer.I was learning the double rayleigh backscattering in my unidirectional system .the signal travels forward and it will be backscattered for the first time and twice time ,which will interface with the forward traveling signal.so i want to research how the double rayleigh back scattered signal affect the forward signal and i wonder if the double backscattered light will be added to the forward traveling signal and how we can measure the double rayleigh backscattering power in optisystem?

[Damian Marek]

When you run a simulation with the Bidirectional fiber the double back-scattered light is given as a parameterized signal at the output. Using an OSA could determine its power in relation to the input signal power.

[Joseph Jiang]

ok，thank you damian，i get the answer！

[Alessandro Festa]

So iterations can be set to 1?

[Damian Marek]

Depending on your total system it might not be 1. However, the Rayleigh backscattering calculation takes place inside the fiber model. If your system has feedback or more than one upstream component then you would need an Initial Delay or extra signal iterations.

Cheers

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