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Monday, December 16, 2013

Difference Between Single Mode and Multi Mode Fiber

Parameter
Single Mode Fiber
Multi-Mode Fiber
Core Size
It has very small sized core and allows only one mode of light to propagate.
It has large Sized core and allows multiple mode of light to propagate.
Sources
1310+ nm lasers 1 and 10 Gb/s
1 Gb/s + w/ DWDM
High precision packaging
850 nm and 1310 nm LEDs
850 nm lasers at 1 & 10 Gb/s
Low precision packaging
Distance Support
This Cable is used to transmit data to long distances. Because as the light passes through the core, the number of light reflections created decreases which decreases attenuation and creates the ability for the signal to travel faster forward. Up to 60 KMs +
This cable is used to transmit data to short distances. Because as the number of lights passes through the core, high dispersion and attenuation reduces the quality of the signal. Up to 2 KMs

Construction
It generally comes in 9/125 construction which means that core to cladding diameter ratio is 9 micron to 125 micron.
It usually comes in 50/125 and 62.5/125 size.
Variations
It has no other variation rather than 9/125.
It comes in two variations:
i)                    Step-Index Multimode Fiber
ii)                   Graded-Index Multimode Fiber.
Cost
The equipment used for communications over Single-mode optical fiber is expensive. But the single mode fiber itself is usually less expensive.
The equipment used for communications over multi-mode optical fiber is less expensive.
Applications
LAN,SAN, Data Centre
WAN, MAN, Campus
Connectors Price
Higher Cost
Low Cost

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