In this paper we describe the boundary conditions for upgrading existing 10G optical transport networks with 40G and 100G channels and the operational issues in multi-rate optical networks.
We demonstrate the transmission of 111-Gb/s POLMUX-RZ-DQPSK over an 1140 km EDFA-only link in the presence of 10x10.7-Gb/s OOK neighbours and show the impact of channel spacing on the cross-talk.
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