Abstract
Increasing the channel data rate (“data rate”) in excess of 10 Gb/s (especially to 40 Gb/s) is very attractive. The smaller channel count creates an opportunity to reduce cost, power consumption, and floor space. This opportunity is only realized when the data rate is increased without significantly adding complexity. (Ultra-) long haul WDM transmission systems are affected much stronger by data rate changes than shorter systems. 1) The channel launch power has to be increased by 6 dB (40 Gb/s vs. 10 Gb/s) to compensate for the four times wider receiver bandwidth. This strongly increases non-linear interactions in the thousands of kilometers of optical fiber. 2) The sensitivity to polarization mode dispersion (PMD) is increased and PMD therefore has to be decreased proportionally.
© 2002 Optical Society of America
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