Error-free unrepeatered transmission of 8/spl times/10.709 Gb/s RZ-DPSK signal over 310 km standard SMF with bidirectional Raman pumping

Error free 8-channel single-span transmission is demonstrated over 310 km standard SMF using RZ-DPSK format and bidirectional Raman pumping, without applying FEC and remote-pumping techniques. (2 pages)