High receiver sensitivity, with 7 dB improvement over a direct detection system, has been achieved in a 400 Mbit/s optical DPSK heterodyne detection experiment using DBR laser diodes with external optical feedback. The influence of the laser output phase noise was evaluated experimentally in good agreement with theory.
No takes yet. Share an insight, caveat, or question.
Emura et al. (1985) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: