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The influences of the transmitted optical power and receiving sensitivity on the optical transceiver

2014-04-21

Transmitting optical power refers to the output optical power of the light source at the transmitting end of the optical transceiver, the unit is dBm. Receiving sensitivity refers to the minimum received optical power of an optical transceiver at a certain rate, the unit is also dBm. In general, the higher the rate, the worse the receiving sensitivity, that is, the greater the minimum received optical power, and the higher the requirements for the receiving end devices of the optical transceiver.

The normality of these two parameters can ensure that the optical module can transmit the specified distance without problems such as light attenuation and packet loss.

When we check the DDM information, we can see the transmit optical power and receiving sensitivity of the compatible optical transceiver. As long as the transmit optical power and receiving sensitivity are within the range of normal values, it can work normally without packet loss and light attenuation. In addition, there is another method to test the emitted light power of the optical module without checking the DDM information. Insert the SFP optical module into the corresponding port of the switch, and connect the optical module and the optical power meter with a jumper. For example, to connect the optical module of the Gigabit single-mode LC interface and the optical power meter of the SC interface, use the LC-SC jumper to connect. Adjust the optical power meter to the 1310nm band, wait for the value, that is, the emitted light power of the optical module.
Before: How to Clean the Optical Transceiver
After: DDM Function of Optical Transceivers