Since dispersion has an accumulative effect, a dispersion compensating fiber can also be used in the line to compensate for the dispersion caused by the fiber. For example if you use a 5km SMF with dispersion=10, then you’ll have a total dispersion of 10×5=50. Now if you use 1km dcf with dispersion=-50, the total dispersion is 50+(-50)=0 and therefore, the dispersion is compensated.
I have attached the modified file, please check the second fiber’s dispersion characteristics and compare it to the first one. BTW, your fiber attenuation is 0.2 dB/km and not zero as you mentioned.