STEP-INDEX MULTI MODE FIBER has a large core, up to 100
microns in diameter. Some of the light rays that make up the digital pulse may
travel a direct route, whereas others zigzag as they bounce off the cladding.
These alternative pathways cause the different groupings of light rays,
referred to as modes, to arrive separately at a receiving point. The pulse, an
aggregate of different modes, begins to spread out, losing its well-defined
shape. The need to leave spacing between pulses to prevent overlapping limits
bandwidth that is, the amount of information that can be sent. So this type of
fiber is best suited for transmission over short distances.
Posted by: Wasim Javed
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