OM4 is a multi-mode optical fiber optimized for laser-based transmissions and is part of the ISO/IEC 11801 standard. It is a progression from the earlier OM3 fiber, offering better performance characteristics. Here are the key details about OM4 fiber:
- Core/Cladding Diameter: OM4 fiber has a core diameter of 50 micrometers (µm) and a cladding diameter of 125 µm.
- Wavelength: Similar to OM3, OM4 fibers are optimized for 850nm wavelength operation.
- Data Rate and Distance: OM4 is designed to handle higher data rates over longer distances compared to OM3:
- At 850nm, OM4 can support 10 Gbps data rates for distances up to 550 meters.
- It can also accommodate 40 Gbps and 100 Gbps data rates for distances up to 150 meters.
- Jacket Color: The typical jacket color for OM4 fiber is aqua, the same as OM3. However, to differentiate between the two, some manufacturers use a violet or purple jacket for OM4.
- Usage: OM4 fibers are ideal for demanding high-speed, short-distance transmissions, making them perfect for modern data centers and high-performance computing environments.
- Applications: While OM4 is commonly employed for 10 Gigabit Ethernet applications, its enhanced performance metrics make it suitable for 40 Gigabit and 100 Gigabit Ethernet over extended distances compared to OM3.
- Bandwidth: OM4 fibers boast an effective modal bandwidth (EMB) of 4700 MHz·km, more than double that of OM3.
- Cost: OM4 fibers typically come at a higher cost than OM3 fibers due to their enhanced performance characteristics.
In the realm of multi-mode fibers, OM4’s introduction represented a substantial advancement, especially in accommodating the burgeoning bandwidth needs of modern data centers. As demands for even greater bandwidth and longer reach continue to mount, developments in fiber technology, such as OM5, are taking the spotlight to meet these requirements.