Design of a Niquist-filtered 100 Gbps PM-DQPSK (DP-DQPSK) transmitter
I have a problem in design of a Niquist-filtered 100 Gbps PM-DQPSK transmitter. I tried to use the optical raised-cosine filter to shape pulse of the generated PM-DQPSK signal, but it failed. I also tried to use the electrical raised-cosine filter to shape the driven NRZ signal, then to generate narrowband (25GHz) optical PM-DQPSK signal, but it failed either. Is there someone can tell me how to design a Niquist-filtered 100 Gbps PM-DQPSK transmitter? Thank you very much!
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