When testing the receiver portion with an optical power meter, which step is necessary?

In the process of testing the receiver portion with an optical power meter, it is crucial to ensure that you are obtaining accurate measurements of the optical signal being received. Disconnecting the jumper from the receiver input allows for an accurate assessment of the power coming directly from the optical fiber to the receiver, without interference from other components in the system. This step isolates the receiver for proper testing and ensures that any readings taken reflect the actual performance of the receiver itself.

By breaking the connection at the jumper, you can connect the optical power meter directly to the fiber optic cable leading to the receiver. This gives you the opportunity to measure the signal strength that the receiver would see, thereby providing insights into its functionality and performance.

Other options, like calibrating the optical power meter or connecting it directly to the transmitter, do not address the importance of isolating the receiver for dedicated testing and could lead to inaccurate measurements that do not reflect the receiver's actual operating condition.