Why optical module need End face cleaning?
If there is a dust, it can affect the transmission performance of the optical module, so cleaning is very important.

HTF optical module manufacture team must ensure that there is no foreign matter connection, and achieve the optical characteristics of low insertion loss and high return loss when the fiber is connected. Make sure SFP+ XFP QSFP28 Tunable transceiver transmission preformance works better.

Any questions? 
Contact HTF team and will assist you asap.
Email: support@htfuture.com