Customers may ask why we need to de-multiplexe OSC channel before OA in OLA.
There are two reasons for this question
1. The wavelength of OSC is 1510nm. But EDFA just used in the 1550nm window, OSC can not be amplifed by EDFA.
2.According to the ITU-T recommendations , OSC should work stable when OA is faulty , so OSC mustn't pass through OA.
After all , OSC can not be amplifed by EDFA , and it mustn't be amplifed by EDFA.