The OM4 fiber type was standardized in 2009, and compared to OM3 fiber, it has a higher modal bandwidth of 4700 MHz/km, while OM3 has a modal bandwidth of 2000 MHz/km. ISO/IEC 11801 defines the OM1, OM2, OM3, OM4, and OM5 types of multimode fiber. It also lists the key technical requirements for each type. These differences include the maximum distance and speed. In modern Ethernet networks, choosing the right multimode fiber optic cable can significantly impact bandwidth, scalability, and long-term infrastructure costs. Two of the most widely deployed laser-optimized multimode fibers are OM3 and OM4, both designed to support high-speed data transmission. OM3 and OM4 are both laser-optimized multimode fibers with 50/125µm fiber cores that are developed to meet the ISO 11801 standard. They share similarities in fiber connectors and application scenarios, which often leads to confusion among users.
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