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szuyul / MMF-simulation

Compute the vectorial model of guided modes in an optical multimode fiber (MMF) and simulate fiber transmission in different representations.
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Discussion #3

Open MrDongZhenyu opened 4 years ago

MrDongZhenyu commented 4 years ago

Hello, I get some problems when I run your simulation with bend fibers. I visualize the TM under PIM or LP basis when the bend curvature changes, but I get results of diagonal orthogonal TM varing pattern. What I supposed to see is some Sub-diagonal component appears as curvature goes down, which means mode coupling between adjacent modes with +1/-1 orbital angular momentum difference. Hope for your help. Thanks bro!

szuyul commented 4 years ago

Hi, depending on the bending curvature and the number of segments, you will see off-diagonal elements. These are simulations based on perturbation theory, so might be inaccurate in strong modal scattering regime.

KritonX commented 3 years ago

bending straight

KritonX commented 3 years ago

Hello! Sorry for bothering. I wonder how can we simulate such a graph in bending situation, rather than the two pictures above image

szuyul commented 3 years ago

Hi, I think the MMF_focusing.m script should do what you need. Alternatively, you can convert the T output from MMF_simTM_LP.m function to pixel representation by using Ex and Ey.

KritonX commented 3 years ago

Many thanks for your information!