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Phase retrieval — a method reconstructing the full optical field only from standard direct-detection measurements at the receiver — is experimentally demonstrated for blind chromatic dispersion, transmitter chirp estimation and for transmission of 56Gbit/s signals over more than 100km SSMF.
We propose a PAM-4 modulation scheme with unequally spaced levels in order to mitigate chirp effects caused by IQ modulators. Experimental results of 56 Gb/s transmission over 25 km link demonstrate the robustness of this modulation concept.
Single wavelength 56Gbps transmission in 640km dispersion-unmanaged link is successfully realized by using direct-detection discrete multi-tone (DMT) modulation method. A single polarization IQ modulator is used to do chromatic dispersion pre-compensation and generate single sideband (SSB) DMT signal. Just one PIN is used to detect the received signal to reduce the cost. More than 3000ps/nm chromatic...
We demonstrate the transmission of 28 Gb/s NRZ-OOK over DCF-free links up to 10 km using a monolithic VCSEL, direct detection and an MLSE-based receiver for low-cost, short-reach interconnects. DSP complexity is also investigated in terms of performance optimization.
Low complexity, single-stage frequency-domain equalization supported by blind CD estimation and training-aided 2×2 MIMO channel estimation is proposed and experimentally demonstrated in a 32 GBaud Nyquist PDM-QPSK transmission system.
A correlation method is proposed allowing for nonlinear penalty prediction including PMD dependency for arbitrary dispersion managed WDM systems with coherent detection. Model results are confirmed by corresponding system simulations.
Accurate prediction of signal quality is presented based on an extended semi-analytical model for coherent detection optical channels after nonlinear transmission over heterogeneous uncompensated links with consideration of modulation formats, channel count, and routing.
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