Hi Naazira
Yeah i also couldn’t find any difference between the two. I wanted to know this as i could find a direct example of COADM in the examples but was unable to find such example of ROADM. So i thot if they could be used interchangeably then i could move a step forward. As even my guide suggested me to do say adding that there is no such remarkable difference despite the fact that in COADM we work on lesser number of wavelengths and in ROADM its just that the number of operating wavelength increase. But I found the difference fishy.
Regards
Burhan