Dear Alistu,
I am sorry for a long waiting time for my reply. I was really busy with all my travels in a past month. I am not sure if you were able to find any relevant papers about the subject of our previous discussion yet. However, here are some main papers that I considered in this research: “Terabit Transmission at 42.7-Gb/s on 50-GHz Grid Using Hybrid RZ-DQPSK and NRZ-DBPSK Formats Over 16 80 km SSMF Spans and 4 Bandwidth-Managed ROADMs”, “Optical Path Aggregation for 1-Tb/s Transmission in Spectrum-Sliced Elastic Optical Path Network”.