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Abstract
chromatic dispersion degrades the digital signal travling through an optical fiber because the individual pluses ara lengthened and start overlapping . the deleterious effect which scales as the square of the data rate occurs because the hih frequency fourier components of the pluses travel faster than the low-frequency components in the dispersive fiber.
in the ptesent thesis, we have investgated the ultimate optical soliton transmissio bit rate of 4800 channels with chromatic dispersion management in ultra-wide wavelength division multiplexing (uw-wdm) systems. thrmal effects are taken into accounts. four effects are investigated namely the soliton bit raie of the segment of hegative chromatic dispersion, the soliton bit rate of the segment of positive chromatic dispersion, the soliton bit rate at at the average contriling sat of parameters, and finaly the average dispersion of the two segments as successive cells the investigation is processed taking into accaount the thermal the spectral , and the static pressure dependences.