If an optical cable is used for long-distance network signals, what equipment should be used to connect the two ends of the optical cable?

I think what you need is an optical fiber terminal box. The function of the optical fiber terminal box is to fuse the optical cable with the pigtail, then use a jumper to connect it to the optical terminal (or optical fiber transceiver).

As mentioned above, if you just want to transmit signals, you only need to use an optical fiber transceiver. If in addition to data signals, there are also video, audio, and other things, then it is still recommended. Optical transceiver.

The brand of optical transceiver is recommended to use Hualong, the brand is relatively guaranteed