IM-DD LONG-DISTANCE MULTICHANNEL WDM TRANSMISSION EXPERIMENTS USING ER-DOPED FIBER AMPLIFIERS

We have demonstrated multichannel wavelength-division multiplexed opti cal signal transmission experiments employing Er-doped fiber amplifier s. Four-channel transmission of 459 km and 1500 km experiments and two -channel transmission of 4550 km experiment are described, and the tra nsmission penalty is analyzed. We also discuss the effect of four-wave mixing. The difference of the transmission fiber clearly shows the di fference of the optical spectrum due to four-wave mixing after long-di stance transmission. The results show the possibility of long-distance multidestination optical communication systems with wavelength-divisi on multiplexed signals combined with Er-doped fiber amplifiers.