Optical fiber connectors are used to connect optical fibers. Table 8-16 lists common optical fiber connectors

Connector Type Optical Fiber Connector
Square connector SC/PC optical fiber connector LC/PC optical fiber connector MTRJ/PC optical fiber connector MPO optical fiber connector
NOTICE:
Before removing an MPO optical fiber connector, pull out the shell of the middle part of the connector.
If an MPO optical fiber connector cannot be completely inserted into an optical port, do not force it into the port. Instead, turn the connector over and smoothly insert it into the optical port again.-
When connecting or removing an LC optical fiber connector, align the connector with the optical port and d not rotate the optical fiber. Pay attention to the following points:
　
To connect an optical fiber, align the optical fiber connector with the optical port and gently insert the optical fiber into the port.
To remove an optical fiber, press the clip on the connector, push the connector inward slightly, and pull the optical fiber out.
Round connector FC optical fiber connector ST/PC optical fiber connector -

Ceramic Ferrule Endface
According to the return loss, ceramic ferrule endfaces of optical fiber connectors are classified into physical contact (PC), ultra physical contact (UPC), and angled physical contact (APC)

Optical Fiber Connector SC/PC LC/PC MTRJ/PC MPO FC ST/PC APC UPC PC YCICT

Polishing Style Return Loss Characteristics Application Scenario
PC –35 dB Flat Scenarios with low requirements on return loss
UPC –50 dB Slightly curved Scenarios with high requirements on return loss
APC –60 dB 8-degree angled