Multichannel bidirectional transmission using a WDM MUX/DMUX pair and unidirectional in-line amplifiers

Abstract

We propose a repeated bidirectional WDM transmission system using cascaded WDM MUX/DMUX pairs as narrow-bandpass filters and reflection attenuators, Fiber span is increased by inserting unidirectional EDFA's between WDM MUX/DMUX pair as in-line amplifiers. A three channel hybrid system with one 10-Gb/s and two 2.5-Gb/s channels is also demonstrated in the 1550-nm region for transmission over 150 km of dispersion-shifted fiber, Negligible power penalty due to back reflection was observed.