Soliton transmission is a possible technique for overcoming the dispersion barrier for linear transmission systems [1]. The first ultra long haul transmission experiment was reported in 1988 and have recently been extended to 10,000 km [2,3]. Practical use of these ultra-long transmission systems, for example in trans oceanic undersea systems, requires using a large number of optical amplifiers and possibly Wavelength Division Multiplexed (WDM) signals. Of particular concern in such systems are the effects of the accumulated spontaneous emission in the amplifier chain and detrimental effects from collisions between WDM soliton data signals.

© 1991 Optical Society of America

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