Oh I see... Sorry I'm still learning. 

I have a few more questions though.

First, with the same script, I tried to visualize the average E-field values for "x" axis and I get the image below. It actually seems that it shows the fiber cavity, but I didn't understand why it shows like there two fibers? 



Second, after the simulations I was able to see the E-field results like "1.23,1.03" etc. Like the first image I've sent. But after the integration process, when I tried to visualize results, it was like "1.14e-06, 9.92e-07". Like previous image I've sent. Why is it shows like this? And since the source's amplitude was "1", can I say there are some amplifications happens in some places on fiber?