Unrepeatered Transmission of 107 Gb/s RZ-DQPSK over 300km NZDSF with Bi-directional Raman Amplification

We demonstrate unrepeatered transmission of 107 Gb/s RZ-DQPSK signals over 300 km nonzero dispersion-shifted fiber by using bi-directionally pumped Raman amplification. The single fiber type and moderate Raman pump powers are compatible with terrestrial network applications.