Cloud native EDA tools & pre-optimized hardware platforms
This example shows that coherent PM-QPSK offers a pre-FEC 2 dB sensitivity improvement over RZ-DQPSK and 1.3 dB improvement over DPSK systems.
The figure below depicts the OptSim layout for coherent PM-QPSK:
The figure below depicts the layout for RZ-DQPSK:
The figure below depicts the layout for DPSK:
The figure below compares OSNR sensitivities of coherent and non-coherent systems as above. As can be seen, coherent PM-QPSK offers a pre-FEC 2 dB sensitivity improvement over RZ-DQPSK and hence can be a viable solution for high bitrate systems.