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Hi,

as a minimalistic example, suppose I have the longitudinal section of a waveguide represented as a rectangle. The left side border (in blue) is the input port, exciting a fundamental TE mode and the right side border is the output mode as shown in the following image:

After making the Boundary Mode Analysis of each mode, I'm able to propagate and obtain this result,

Now my problem is that I want to make an overlap integral between the modes of both ports (1 and 2). I have followed these steps without success:

In the Definitions toolbar, under Component Couplings, I chose Integration (intop1) and selected just the left and right boundaries. Also on Definitions > Variables 1, I defined the variable ovInt as:

intop1(ewfd.tEmodez_1*conj(ewfd.tEmodez_2))

(I know I need to normalize the fields first, but this is just to illustrate the problem)

After running the model and using Global Evaluations to try to obtain the value of the overlap integral (ovInt), I get an error message saying what I believe is an error due to the fact that the variable comp1.ewfd.tEmodez_2 doesn't exists on the left border. This I used to solve using a Join database operator. But this solution doesn't works when you are using two edges of the same database.

This is the complete error message:

Undefined variable. - Variable: comp1.ewfd.tEmodez_2 - Geometry: geom1 - Boundary: 1 Failed to evaluate expression. - Expression: conj(comp1.ewfd.tEmodez_2) Failed to evaluate expression. - Expression: conj(comp1.ewfd.tEmodez_2)comp1.ewfd.tEmodez_1 Failed to evaluate expression. - Expression: comp1.intop1(conj(comp1.ewfd.tEmodez_2)comp1.ewfd.tEmodez_1) Failed to evaluate variable. - Variable: comp1.ovInt - Defined as: comp1.intop1(conj(comp1.ewfd.tEmodez_2)*comp1.ewfd.tEmodez_1) Failed to evaluate expression. - Expression: comp1.ovInt

Thanks in advance.