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▪ Coherent detection enables the highest spectral efficiency by allowing information be encoded in amptitude and phase. ▪ Homodyne or heterodyne downcoverter recovers the field in each polarization, and sampling above Nyquist rate enables compensation in DSP with no loss of information. ▪ CD and PMD are linear distortions and can be compensated by a linear filter in both single-carrier and OFDM transmission...
We compare Duobinary, RZ-DPSK, RZ-DQPSK modulation formats for long haul optical fiber transmission for 40-Gb/s DWDM systems with 50-GHz channel spacing by numerical simulation.
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