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Coherent PM-QPSK versus RZ-DQPSK and DPSK for High Bitrate Systems
Tool Used: OptSim
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.
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