CCD SFP transceivers are available with a variety of different transmitter and receiver types,
allowing users to select the appropriate transceiver for each link to provide the required
optical distance
over the available optical fibre type (e.g.
multi-mode fibre or
single-mode fibre).
Optical SFP modules are commonly available in several different categories: 850 nm 550m MMF (
SX),
1310 nm 10 km SMF (
LX), 1550 nm [40 km (
XD), 80 km (
ZX), 120 km (
EX or
EZX) and CWDM.
SFP tranceivers are also available with a copper cable interface, allowing a host device designed primarily
for optical fibre communications to also communicate over unshielded twisted pair networking cable.
There are also
CWDM and single-fibre "bi-directional" (1310/1490 nm
Upstream/
Downstream) SFPs
.