Brother, I will only get access to optisystems on tuesday.
I checked with others. For my project with 3 users, the algorithm that I wrote above is correct.
So for each user, I will have 2 FBGs at encoder side, and 4 FBGs at decoder side (for complementary detection/ 2 Top and 2 bottom FBG arrays). If possible, could you please be kind enough to just edit that osd file and instead use 2 FBGs for each user at encoder side, and 4 FBGs for each user at decoder side using the wavelength values that I mentioned? And white light source frequency should probably be the center frequency (1550.8 nm).
If it runs after this work, then my project will be successful. Its due in a few days and I have no access till tuesday.
Its just 5 minutes work for u.
Please be kind enough to help this little brother out.