Yes, you can connect two routers to one fiber modem, but understanding the 'how' and 'why' is crucial for optimal network performance. An SFP transceiver, short for Small Form-factor Pluggable transceiver, is a compact, hot-swappable networking module used to transmit and receive data over copper or fiber optic cables. It is designed to be inserted into SFP ports on network devices such as switches, routers, and network interface. The easiest way to do is, terminate your ISP connection to single router with at least 2 independent LAN interfaces, then you can build 2 separate networks there. Can I Connect Two. Which you need is primarily determined by what form factors are compatible in the switch or router the optic is to be plugged in to, so it's always good to check what your system accepts. Without the right form factor for your network environment, the optic may not fit into your switch or router at. To connect all these network devices to fiber optics infrastructure, Cisco offers an extensive portfolio of pluggable optical transceivers spanning multiple form factors, reaches, and speeds, which are qualified across the largest portfolio of routers, switches, and servers in the industry.