While I simulating my optical fiber design, I get some positive and some negative values of refractive index imaginary part. As I know, I must get negative values to compute confinement loss. I can't understand where is the problem. Please help me with your valuable opinion.
Thanks in advance.
I think it could be helpful mam,
In the context of optical waveguides, such as optical fibers, it is indeed possible and common to have a negative imaginary part of the refractive index. The imaginary part of the refractive index is associated with the absorption or loss in the material. A negative imaginary part indicates gain rather than loss, and this is indeed relevant in certain scenarios.
Confinement loss in optical fibers is influenced by the imaginary part of the refractive index. In some cases, you may have materials or designs where the imaginary part is negative, indicating gain or amplification rather than absorption. This gain can counteract the loss and contribute to confinement, particularly in doped or active fibers used in optical amplifiers.
So, in the specific context of optical fibers, it is possible to encounter scenarios where the imaginary part of the refractive index is negative. This can be associated with gain media within the fiber. It's important to consider the specific characteristics of the materials and designs being used in your simulation, as well as the wavelength range of interest, to correctly interpret and apply the results.