Optical transceiver is a small yet powerful device that can both transmit and receive data. In fiber optics, this data is sent in the form of pulses of light over an optical fiber, at very high speeds and across long distances. Fiber optic SFP modules transmit and receive light pulses over optical fiber cables. SFP module can configure more than double the number of ports on the same panel.

The difference between single-mode and dual-mode SFP:

Single-mode: The size of single-mode optical module is 9-10/125μm, and it has unlimited bandwidth and lower loss than multi-mode fiber. Single-mode optical transceivers are mostly used for long-distance transmission, sometimes up to 150 to 200 kilometers. Use LD or LED with narrow spectral lines as the light source.

Multimode: Almost all multimode sfp module sizes are 50/125um or 62.5/125um, and the bandwidth (the amount of information transmitted by the fiber) is usually 200MHz to 2GHz. Multi-mode optical transceivers can transmit up to 5 kilometers through multi-mode optical fibers, using light-emitting diodes or lasers as light sources.