DESIGN OF BIDIRECTIONAL COMMUNICATION-SYSTEMS WITH OPTICAL AMPLIFIERS

The performance of four different configurations implementing bidirect ional communication systems with erbium-doped fiber optical amplifiers in a 622 Mb/s IM/DD system is theoretically compared. The transmissio n span and the tolerance to variation in link attenuations (attenuatio n margin) are studied as a function of the amplifiers' position in the link. Operating the amplifiers slightly into saturation (0.4 dB) turn s the configurations robust with respect to changes in link attenuatio ns (4.0-dB improvement in the tolerable increase of attenuation, for a span of 76.9 dB).