Investigation of spectral efficient modulation formats for 400Gbit/s/port optical packet switched system

We investigate the performance of NRZ-OOK, NRZ-DPSK, NRZ-DQPSK, NRZ-8 PSK and NRZ- 16-QAM modulation and their influence to an optical packet switched systems (OPS) performance. The aim was to demonstrate that OPS systems can be spectrally efficient.