OM3 and OM4 are both laser-optimized multimode fibers, but OM4 offers higher bandwidth and longer transmission distances, making it more suitable for high-speed applications.

Key Specifications

1. Core Diameter: Both OM3 and OM4 fibers have a core diameter of 50 µm. This allows them to support multiple light modes, which is essential for high-speed data transmission.

2. Bandwidth:

   • OM3: Has an effective modal bandwidth (EMB) of 2000 MHz·km. This bandwidth supports 10 Gigabit Ethernet (10GbE) over distances up to 300 meters.
   • OM4: Offers a significantly higher EMB of 4700 MHz·km, allowing it to support 10GbE over distances up to 400 meters. This makes OM4 a better choice for applications requiring higher data rates and longer distances .

3. Maximum Transmission Distances:

   • OM3: Supports distances of 1000 meters for 1 Gbps, 300 meters for 10 Gbps, and 100 meters for 40/100 Gbps applications.
   • OM4: Also supports 1000 meters for 1 Gbps, but extends to 550 meters for 10 Gbps and 150 meters for 40/100 Gbps applications .

Applications

• OM3: Commonly used in data centers and enterprise networks for 10G applications, OM3 is suitable for moderate-distance connections and is often chosen for cost-sensitive projects where high bandwidth is not critical.
• OM4: Preferred for new installations in data centers and enterprise environments, OM4 is ideal for high-speed applications, including 40G and 100G Ethernet, due to its enhanced bandwidth and longer distance capabilities .

Conclusion

In summary, while both OM3 and OM4 fibers are effective for multimode applications, OM4 provides superior performance in terms of bandwidth and distance, making it the preferred choice for modern high-speed networking environments. If your application requires higher data rates or longer distances, OM4 is the better option. For less demanding applications, OM3 may still be a cost-effective solution.