Hi all, I have simulated a structure with 3 different materials in the geometry of fiber which should have different loss with different wavelength. In fact, I should find the best fundamental mode in the correct wavelength. I see a lot of fundemantal modes in different wavelengths. I have some questions: 1) which mode could be selected correctly? 2) which range of wavelength could be selected correctly? in fact, I do not know the functional wavelength in that structure.
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