Features of IGFF: 
Low Insertion Loss, 
High Isolation, 
Flat Spectral Gain, 
High Stability and reliability 

Applications: 
EDFA
Transmitters
WDM & DWDM
System Testing instruments

Please download the Optical Isolator + Gain Flattening Filter Hybrid - IGFF PDF here
 Isolator + Gain Flattening Filter Hybrid - IGFF