Hi Zulkarnain, I will not be able to provide you with the link or details as i read it one of paper online about what you have asked regarding ” the power of the optical signal should not be more than 6 dBm for in line (i.e. fiber) transmission in practical case though in simulation platform we use 10 dBm as launch power in many of the cases.” I will try to find the same link and let you know if I get it.
Regards,
Dhiman