Abstract

Optical frequency-division-multiplexing (FDM) techniques have been intensely studied for future lightwave communication networks. A 100 channel optical FDM transmission/distribution experiment at 622 Mb/s over 50 km has been demonstrated^[1], and common amplification of 100 channels has been also achieved by employing an Er³⁺-doped fiber amplifier^[2]. The advent of the optical amplifier raises the concern of optical nonlinear effects, and removes fiber-loss as the dominant concern in lightwave communication systems.

© 1992 Optical Society of America