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High spectral efficiency in wavelength-division multiplexing (WDM) coherent optical communications can be achieved by lowering the channel spacing to a value close to the baud rate. As a result, such communication systems are subject to a high level of two-dimensional (2D) interference, originating from both chromatic dispersion (CD) within WDM channels and… (More)
We propose space-time codes to mitigate mode dependent loss in spatial division multiplexed optical transmission systems using multi-mode fibers. The codes can replace or complement mode scrambling used to reduce loss disparities between the modes.
In mode-division multiplexed (MDM) transmission systems, mode coupling is responsible for inter-modal crosstalk. We consider the transmission of modulated signals over a few-mode fiber (FMF) having low mode coupling and large differential mode group delay in the presence of a non-ideal fiber connection responsible for extra mode coupling. In this context,… (More)
The goal of this paper is to describe the generation and present characteristics sequences analysis called pseudo random quaternary sequences witch show very remarkable properties. To emulate a real traffic data transmission using Differential Phase Shift keying (DQPSK) modulation format with four levels of phase, we are affecting towards pseudo random… (More)
We numerically investigate the multi-channel transmission performance of Polarization Switched Quadrature Phase Shift Keying (PS-QPSK) and we compare it to the performance of Polarization-Division-Multiplexed QPSK (PDM-QPSK), using Root Raised Cosine (RRC) spectral shaping, in the context of a flexible channel grid. We point out the impact of the roll-off… (More)