FC Variable attenuator is general used for testing and measurement, but they also have a wide usage in EDFAs for equalizing the light power among different channels

SC Variable attenuator is general used for testing and measurement, but they also have a wide usage in EDFAs for equalizing the light power among different channels

ST Variable attenuator is general used for testing and measurement, but they also have a wide usage in EDFAs for equalizing the light power among different channels