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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)
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)
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