Reachoptics offering RED/BLUE EDFA to use in the DWDM System ( Pre Amplifier) 
PA 16/20-B/R
PA 16/20-R/B

Midstage access：
Designed for insertion of a DCM unit without its inherent insertion loss； 
Designed for insertion of a OADM unit without its inherent insertion loss；
Advanced network management features: Optional OSC management channel for remote management
MON own monitoring port, on-line monitoring optical power and OSNR
Supports SNMP, Web, console management; RO9810 chassis compatibility.