Hi Hamdi,
Here i have attached the modified file where I have increased the lasers power to 0dBm. I also changed linewidth to 0.1 MHz which is an acceptable value for low power lasers. I don’t know about the file you where loading dispersion data in dispersion compensating fiber, so I used “constant” option and entered the proper values. However, you can use your own settings if you want. The Q-factor is now more than 8.
Regards