10GBASE-SR is a port type for MMF (multimode fiber) and uses 850 nm lasers. For longer reach,another standard defined in IEEE 802.3ae is 10GBASE-LR.10GBASE-LR is a port type for SMF (single mode fiber) and uses 1310 nm lasers. Traditionally SMF 10GBASE-LR SFP+ modules are way more expensive than MMF 10GBASE-LR SFP+ modules. MMF and SMF historical short range / long range paradigm may change in short term:since 2014,for new installations,especially indoor,SMF wiring is about half of MMF wiring. As a consequence,lots of new buildings and datacenters now standardize on SMF. But 10GBASE-LR SFP+ transceivers are too expensive for short-range connections. A new market for short distances over SMF has been created:the industry is standardizing on a new class of SMF 10G transmitters with typical 10GBASE-LR LITE SFP+ transceivers. While not a standard yet,10GBASE-LR LITE has a specified reach of 2 km over standard 9µm single mode fiber. 10GBASE-LR LITE isn’t a replacement for 10GBASE-LR optics:it is just relevant alternative for “shorter” reach SMF applications.
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