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Near-space platforms defined as the aerocrafts flying in the space region between 20km and 100km which is above the storms and not constrained by orbital mechanics like satellites or high fuel consumptions like airplanes, they can stay at a specific site almost indefinitely to provide a persistent coverage. Although current spaceborne and airborne synthetic aperture radar (SAR) systems have playing...
We demonstrate a pilot-symbol assisted joint polarization carrier phase estimation technique that detects cycle slip and avoid error propagation. Coherent detection without differential coding is feasible when the cycle slip probability is less than 10-3.
We investigate fast phase wandering observed in coherent detection long-haul transmission experiments. We demonstrate the phase wandering is a broadband nonlinear effect. We compare its impact on different coherent modulation and detection schemes.
A hybrid polarization division multiplexing (PDM) technique was demonstrated for 40 Gb/s RZ-DPSK signal without polarization tracking receiver (PTR). Long-term Q-factor measurements and DGD tolerance study showed performance similar to offset PDM and regular PDM with PTR.
We study transmission of 40 Gb/s signals using coherent RZ-QPSK with and without polarization multiplexing using 100 km large effective area fiber-spans and dual-stage EDFAs with mid-stage dispersion compensation. We show advantage and disadvantage of coherent detection schemes.
We implemented a maximum a posteriori probability (MAP) detection scheme for mitigating nonlinear phase distortion. We demonstrated 1 dB improvement in system performance and ~2dB higher nonlinearity tolerance after 6,000 km transmission.
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