Equip 254236 Datasheet download pdf (Page 60)

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Optical Fiber

An optical ber system transmits the data using light pulses down the ber lines instead of electronic pulses as the copper

connections do. This means of communication is gradually replacing copper networking due to the relative low maintenance

cost. The light travels through the ber lines easily because of the principle known as the total internal reection, which

indicates that when the angle of incidence exceeds a critical value, light cannot get out of the glass; instead, the light

bounces back in.

The way the ray disperses varies with the diameter of the glass ber. In the thicker ber line (50-100μm), the light is reected

in a zigzag patter, and thus a higher attenuation occurs. The connection can be divided into two types based on the core of

ber line.

Single Mode Cable is constructed of a single strand of glass ber with a diameter of 8.3 to 10μm. The smaller core

eliminates the distortion of light wave and causes less attenuation. Therefore, it carries a higher bandwidth and sustains a

longer distance (>1000m) than a multimode ber cable does, but the cost is higher as well.

Multi Mode Cable has, on the other hand, a thicker core normally between 50 to 100μm. Typical core diameters of optical

ber patch cords are 50μm (OM2, OM3, OM4) and 62.5μm (OM1). The multi mode optical bers feature attenuation is higher

compared to the single mode cables but are able to offer a high bandwidth within a medium distance. As a result, the multi

mode cables are more preferable in the deployments with a short range

"Single mode ber"

single path through the ber

"Multimode ber"

multiple paths through the ber

Multi Mode Single Mode

OM1 OM2 OM3 OM4 OS1 / OS2

Core Diameter (μm) 62.5 50 50 50 9

Cladding Diameter (μm) 125 125 125 125 125

Wavelength (nm) 850 1310 850 1310 850 1310 850 1310 1310 1550

Max. Attenuation (dB/km) 2.9 0.7 2.4 0.7 2.5 0.7 2.4 0.6 0.34 0.19

Max. Transmission 1Gbps 300m 500m 500m 500m 1000m 500m 1000m 500m 10km 50km

10Gbps 30m 220m 80m 220m 300m 220m 500m 220m 10km 40km

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Equip 254236 Datasheet Page 60