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optical fiber bent
Posted Jan 21, 2020, 10:41 a.m. EST RF & Microwave Engineering, Wave Optics, General 1 Reply
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Hi, I am working on optical fiber simulation.I am trying to simulate bent fiber with parabolic graded index profile where n (refractive index profile function) is dependent on "r" and given by the following expression:
n(r)= n1sqrt(1-2delta(r^2/a^2) if r=<a
=n2 if r>a
The Modified refractive index n(equivalent) in bent fiber is given by: n(1+x/(1.4Rb)).
With Comsol, I can simulate the straight fiber but "bent fiber" seems confused to me. there is a confusion between "x" and "r". can anyone help me on that.
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Hi, I recommend to have a look at our bent fiber example model: https://www.comsol.com/model/step-index-fiber-bend-14189 It simulates both the straight and bent fiber. The bent fiber is simulated in axisymmetric 2D, so the variable "r" is the distance from the symmetry axis. I think you mean the distance to the center of the fiber is called "r"? You may need to change your equation for the refractive index profile accordingly.
I hope this helps. Best wishes, Lars