The optical module must have good transmission performance, and its transmitted optical power and received optical power must be within the normal range. So how to test whether the transmitted optical power and the received optical power of the optical module are within the normal range?
Generally speaking, customers can directly monitor whether the transmit optical power and receive optical power of the optical module are normal through the DDM function (digital diagnostic monitoring function) of the optical module.
However, if the DDM information of the optical module is abnormal or does not support this function, it is recommended that you first troubleshoot the optical module, and then solve the problem, you can obtain the value of the optical module's transmit optical power and receive optical power.
In addition, you can also use the optical power meter to obtain the transmitted optical power value of the optical module. Taking the 10GBASE-LR SFP+ optical module as an example, the test steps are as follows:
1. If the measured transmitted optical power or received optical power is less than -30dBm (including -30dBm), it is usually because no actual signal has been transmitted or received.
2. If the received optical power is less than -14dBm (including -14dBm), it is usually due to some kind of failure in the cable equipment, such as poor connectors, contaminated connections, and the use of optical fiber jumpers, resulting in excessive signal loss.
