I used the wave optical module to build a multi-core fiber model, in the mode analysis calculation to get a series of electric field diagram, I want to calculate the crosstalk between the two fiber cores, which involves a formula that contains an integral function for the two core regions of the electromagnetic field product, integration area for a fiber core range of double integral, I only know that ewfd.normE can represent the electric field information of the entire fiber section, how can I represent the electric field of the two fiber core local areas separately? Thank you so much!
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