JassonFiber's optical coupler, also called opto-coupler or opto-isolator, is "an electronic coupler designed to transfer electrical signals by utilizing light waves to provide coupling with electrical isolation between its input and output".  The main purpose of an optical coupler is "to prevent high voltages or rapidly changing voltages on one side of the circuit from damaging components or distorting transmissions on the other side."

Jassonfiber Optical Coupler Key Features        
Low Insertion loss
High Return Loss
Option Coupling Ratio
Wide Operating Temperature
Excellent Environmental & Mechanial Stability
 
Jassonfiber Optical Coupler Applications        
FTTX (FTTP, FTTH, FTTN, FTTC)
Passive Optical Networks (PON)
Local Area Networks (LAN)
EDFA systems
Test Equipments.