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SIR I AM ONE CABLE TV OPERATOR, IN MY CONTROL ROOM WE USE E D F A , TO SEND OPTICAL SIGNAL TO LONG DISTANCE. IS IT POSSIBLE ANY ONE SIT IN MY CABLE ROUTE AND CUT MY CABLE AND SEND POWER FULL LASER IN OPPOSITE DIRECTION AND THE POWER OF THAT LASER CAN DAMAGE MY E D F A ? IN MY LINE WE...