UnitekFiber Solution.
UnitekFiber Solution.
What is the difference between multimode and singlemode fiber?

What is the difference between multimode and singlemode fiber?


Multimode Fiber:

Multimode fibers that can propagate hundreds to thousands of modes are called multimode (MM) fibers. According to the radial distribution of refractive index in the core and cladding, it can be divided into step multimode fiber and graded multimode fiber.

Almost all multimode fibers are 50/125 μm or 62.5/125 μm in size, and the bandwidth (the amount of information transmitted by the fiber) is typically 200MHz to 2GHz. Multimode optical transceivers can transmit up to 5 kilometers through multimode optical fibers. Light-emitting diodes or lasers are used as light sources.

Single Mode Fiber:

Single mode fibers that can only propagate one mode are called single-mode fibers. Standard single-mode (SM) fiber has a refractive index profile similar to that of step-type fiber, except that the core diameter is much smaller than that of multimode fiber.

The size of single-mode fiber is 9-10/125μm, and compared with multi-mode fiber, it has the characteristics of unlimited bandwidth and lower loss. The single-mode optical transceiver is mostly used for long-distance transmission, sometimes reaching 150 to 200 kilometers. LDs or LEDs with narrow spectral lines are used as light sources.

Single-mode equipment typically operates on both single-mode fiber and multi-mode fiber, while multi-mode equipment is limited to operating on multi-mode fiber.


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