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We demonstrate a novel coherent digital-self-homodyne detection scheme with 4/16/64-QAM signals. The proposed receiver is insensitive to laser linewidth, signal polarization state and modulation format. Resilience to fiber nonlinearities is also improved by 3.5dB.
A real-time FPGA-based receiver of 21Gb/s PS-QPSK signal is reported and tested against optical noise, chromatic dispersion (CD), polarization mode dispersion (PMD) and state of polarization (SOP) scrambling. A comparison with PDM-QPSK realized with equivalent parameterized setup and signal processing confirm the greater tolerance of PS-QPSK over PDM-QPSK.
We present the transmission of time domain hybrid QAM signals in order to maximize spectral efficiency according to link conditions. Single carrier (28 Gbaud) and superchannel (up to 1.15 Tb/s) transmission is demonstrated.
The impact of phase distortions caused by imperfect return-to-zero (RZ) pulse carving on 112 Gb/s polarization-multiplexed (PM)-RZ-quadrature-phase-shift-keying (QPSK) is investigated, and mitigation of the phase distortion is demonstrated by using digital signal processing technique. We show that carver-induced phase distortion causes an error in frequency offset estimation as well as sensitivity...
This paper deals with the problem of synchronization of bursty offset QPSK signals in the presence of frequency offset and additive white Gaussian noise. The main tasks of the receiver are to detect a burst (a frame of data) with a low acquisition time, to estimate and cancel the frequency and phase offset (carrier recovery), perform timing recovery, matched filtering and finally recover the data...
The tolerance to PMD of 100 Gb/s PDM-QPSK systems is investigated in linear and nonlinear regime. Experimental results show that nonlinear effects decrease the robustness of the system against PMD.
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