Yk. Chen et al., SIMULTANEOUS IN-SERVICE FAULT-LOCATING AND EDFA-MONITORING SUPERVISORY TRANSMISSION IN EDFA-REPEATERED SYSTEMS, Electronics Letters, 30(25), 1994, pp. 2145-2146
In-service WDM-based supervisory transmission in four/five EDFA-repeat
er 375km/365km systems is demonstrated. Simultaneous EDFA status-monit
oring and fibre fault location are achieved without degrading the 2.5G
bit/s service.