Difference Between Single mode SFP and Multimode SFP

Difference Between Single mode SFP and Multimode SFP

The single mode SFP or multimode SFP means the SFP transceivers which work at different types of optical fibers, ie single mode SFP will work with single mode fiber, while multimode SFP will work with multimode fiber.

Single mode SFP vs Multimode SFP

What Is Singlemode SFP?
Single mode fiber SFP has much tighter tolerances for optics used. The core is smaller and the laser wavelength is narrower. This means that SMF has the capability for higher bandwidth and much longer distances in transmission. Single mode SFP (SMF SFP) work mainly in 1310nm and 1550nm wavelength and is mostly used in long distances transmission environment reaching 2km, 10km, 40km, 60km, 80km, and 120km. The color coded bale clasp and color arrow on labels are generally blue, yellow or purple. And the color of compatible fiber optic patch cord is yellow.

  • Blue is the 1310nm module
  • Yellow is the 1550nm module
  • Purple is the 1490nm module

What Is Multimode SFP?
Multimode fiber (MMF) uses a much bigger core and usually uses a longer wavelength of light. Because of this, the optics used in MMF have a higher capability to gather light from the laser. In practical terms, this means the optics are cheaper. The common multimode SFP (MMF SFP) work in 850nm wavelength and is only used for short distance transmission reaching 100m and 500m. Though it’s not able to transport for long distance, it can transport many kinds of optical signals. Their color coded bale clasp and color arrow on labels are black and the used fiber optic patch cord is usually orange.

When Using Singlemode SFP & Multimode SFP

  • Ensure that the SFPs in both ends of the fiber patch cord are of the same wavelength. A simple method is that the color of the modules must be consistent.
  • In general, to ensure the data accuracy, short-wave SFP modules use with multimode fibers (ie. orange fiber patch cord), while long-wave SFP modules use with single-mode fiber (ie. yellow fiber patch cord).
  • Do not over bend or winding fiber optic cables when using them. This will increase the attenuation of light in transit.
  • If you don’t use the SFP, you must use the dust plug to protect the optical bore.

What are Cisco SFP modules?
What are the different types of SFP modules?
What is Cisco SFP stand for?
What does SFP stand for in Cisco switch?

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