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Capacity increase larger than 33% of an optimized Direct-modulation Direct-detection OFDM link is experimentally demonstrated. This was achieved by optimizing Volterra filter design.
We analyze the phase noise contribution to the photocurrent of the multilevel direct detection receiver based on delay line interferometer (DLI) and balanced photodetector. We show that the phase noise influence in multilevel systems is much stronger compared to that in binary systems as a result of the DLI configuration. The characteristic function of the photocurrent is derived for arbitrary-delay...
We show how to estimate accurately the Jones matrix of the transmission line by analyzing the Stokes vector of DP-QPSK signals. Our method can be used to perform in-situ PMD measurements in polarization-multiplexed QPSK systems.
We propose a digital clock and timing recovery algorithm for coherent transmission with multilevel modulation formats and demonstrate its robustness against signal distortions due to CD, PMD, ASE- and phase noise.
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