Hi sayed
Your system is working properly and all the parameters are set correctly.Only thing you have to do is set the FBG BW around 20THz and change the center freq. of FBG to 193.1.You were getting the results on only that channels which were in 1THz of BW from your FBG selected center freq.Try it and you will desired results.I will attach file,once you try it by your own.
Regards