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Contact SupplierO-Vision Gold EDFA 23 DBM (4 out x 16.5DB ) is used to cascaded amplification in the CATV system, It has high saturated output power, low distortion In addition, the gain fiber of EDFA is single-mode and single-clad fiber, pump is directly coupled into fiber core, while fiber core is very small, it is required the pump is single-mode.