The difference between multimode fiber OM3-150 and OM3-300
Time:2025-02-14
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The OM3 patch cord is a 10 Gb multimode patch cord. Multimode fiber uses light-emitting diodes as the light source, allowing multiple beams to propagate in the fiber simultaneously, resulting in modal dispersion. Modal dispersion technology limits the bandwidth and distance of multimode fiber. Therefore, multimode optical fiber has thick core wires, low transmission speed, short distance, and poor overall transmission performance, but its cost is relatively low. It is usually used for buildings or geographical areas. The location is adjacent to the environment.
OM3 fiber is a laser-optimized fiber type that provides higher transmission bandwidth within the 850nm transmission window. In Gigabit networks, OM3 can support transmission distances of 550 meters, and in 10 Gb Ethernet, OM3 can transmit up to 300 meters. In 40G/100G Ethernet, OM3 can transmit up to 100 meters.
The bandwidth of multimode optical fiber is 50 MHz~500 MHz/Km, and OM3 can be divided into two series, namely OM3-150 and OM3-300. OM3-150 means that the maximum transmission distance of this type of jumper in 10Gb Ethernet is 150 meters, and OM3-300 means that the maximum transmission distance of this type of jumper in 10G Ethernet is 300 meters. In addition to the different transmission distances, the effective bandwidth of OM3-150 and OM3-300 optical fibers is different: the effective bandwidth of OM3-300 is much higher than that of OM3-150, as shown in the following table:
| Optical Characteristics | Wavelength | OM3/150 | OM3/300 |
| attenuation | 850nm | ≤2.3dB/km | ≤2.3dB/km |
| 1300nm | ≤0.8dB/km | ≤0.8dB/km | |
| Full injection bandwidth | 850nm | ≥700MHz·km | ≥1500MHz·km |
| 1300nm | ≥500MHz·km | ≥500MHz·km | |
| Effective bandwidth | 850nm | ≥950MHz·km | ≥2000MHz·km |
| 10 Gigabit transmission longest link | ≤150m | ≤300m |
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