SFP transceivers, otherwise called small form-factor pluggable or mini GBIC, is a hot-pluggable optical transceiver module which is regularly utilized for both media transmission and data communications applications. As indicated by the link type it utilized together with, SFP transceivers are separated into single mode SFP and multimode SFP. Single mode SFP works with single mode fiber, while multimode SFP works with multimode fiber. This article will give you information about the differences between single and multimode.

Single-mode SFP vs Multimode SFP


What are Single Mode SFP and Multimode SFP?

As referenced above, single mode SFP (SMF SFP) works over single mode fiber which has a typical core diameter of 9µm. Furthermore, the cladding diameter across of a solitary mode fiber is 125µm. Single mode SFP works for the most part in 1310nm and 1550nm wavelength. It is ideal for long-reach data transmission applications achieving 2 km, 10 km, 40 km, 60 km, 80 km and 120 km. There are numerous kinds of single mode SFP modules, for example, 1000BASE-EX, 1000BASE-ZX, etc.

Multimode SFP (MMF SFP) works over multimode fiber with the diameter of 50 µm and 62.5 µm, and the cladding diameter across is 125µm too. The normal multimode SFPs work in 850nm wavelength and are utilized for short distance transmission, achieving 100 m and 500 m. There are numerous kinds of multimode SFP modules, for example, 1000BASE-SR, etc.


Working Wavelength

Single mode SFP module has a narrower laser wavelength, which works essentially in 1310nm and 1550nm wavelength. Though multimode SFP module works in 850nm wavelength because of the bigger core size.


Color Coding

The color coded bale clasp of single mode SFP modules are commonly structured in blue, yellow or purple. Blue is the 1310nm module, yellow is the 1550nm module and purple is the 1490nm module. The color of the compatible fiber optic patch cord is yellow. While the color coded bale clasp and color arrow on the label of the multimode SFP modules are dark and the utilized fiber optic patch cord is typically orange.



Single mode SFP and multimode sfp utilize various sorts of transmitters. VCSELs are typically used in multimode SFP transceivers. They can be tried on the wafer level and don’t need a hermetic package. Edge-emitting lasers, for example, Fabry– Pérot, DFB and DBR lasers, are used in single mode SFP modules for various spans and applications. They have complex layer structures and regularly require a hermetic bundle to accomplish higher emission power and stable single mode operation. Hence, Edge-emanating lasers are more pricey than VCSELs.



When comparing single mode SFP versus multimode SFP regarding cost, single mode SFP is more costly than multimode SFP. The cost contrast between single mode SFP and multimode SFP for the most part emerges from the various transmitters they use. As referenced above, the transmitter of single mode SFP is more pricey than the multimode SFP. Multimode SFP module is less expensive.


How to purchase and use them

When we purchase single mode SFP or multimode SFP in the market, we should affirm the transmission distance and wavelength we need. This will assist us with choosing the ideal SFP types. The expense for transceiver module is likewise a huge factor considered by numerous clients. Tthe compatible SFP module should be recommended as a simple and convenient choice. Since it forfeits no quality or dependability as well as has a low cost.



Tips on utilizing Single Mode SFP and Multimode SFP

Single mode SFP and multimode SFP modules are both utilized in the switch slot and support data communication over either fiber optic or copper cable. When you utilize single mode SFP or multimode SFP, you would be advised to remember these tips:

  • Ensure that SFPs have identical wavelength and color coding at the two end points of the fiber patch cord.

  • To guarantee the data accuracy, short-wave SFP modules are commonly used with multimode fibers, while long-wave SFP modules with single mode fiber.

  • Secure the optical port by plugging the dust plug in when not utilizing the SFP.


We can see that single mode SFP is appropriate for long-distance data transmission applications while multimode SFP is commonly used for short distance transmission. Which to pick relies upon the genuine needs. Unoptix supplies different sorts of optic transceivers accessible in both single-mode and multimode. If you are looking for a wide variety of transceivers visit Unoptix webshop for more information.