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Question Simulate a clear optical fiber 

Forum: Processes Involving Optical Photons
Date: 21 Oct, 2009
From: Simone Riggi <Simone Riggi>


I'm trying to model a clear optical fiber (core+one cladding, NOT WLS). At the moment I'm just considering the fiber as two concentric tubes with two different refraction indexes attached (1.49 for core and 1.42 for cladding) and an absorption length spectrum (same for core and cladding).

Is this correct or is there a better way of modeling the clear fiber?

Another question concerns light propagation.

With the scheme described above, I can get total reflections only if the light directly strikes the core from the fiber end. In fact when photons hit the fiber from the lateral side, they first encounter the clad layer. They can propagate through refraction into the core but cannot give rise to internal reflections in the core. The fiber in this case cannot transport photons. This is simply explained with the Snell's law.

It is not totally clear to me if I have to expect a light confinement also in the case of photons hitting the fiber from the lateral side. If this is the case, what is the optical mechanism responsible for that? Rayleigh diffusion with fiber impurities?

Any help is very appreciated,



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1 Feedback: Re: Simulate a clear optical fiber   (Gumplinger Peter - 21 Oct, 2009)
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