"OM" stand for optical multi-mode, that is, optical mode, is a standard for multi-mode fiber to indicate fiber level. The bandwidth and maximum distance of different levels of transmission are different. This article will mainly explain the difference between OM1, OM2, OM3 and OM4 fiber.
1.OM1 refers to a 50um or 62.5um core diameter multimode fiber with a full injection bandwidth of 850/1300nm above 200/500MHz.km.
2. OM2 refers to 50um or 62.5um core diameter multimode fiber with 850/1300nm full injection bandwidth above 500/500MHz.km.
3. OM3 is a 50um core diameter multimode fiber optimized by 850nm laser. In 10Gb/s Ethernet using 850nm VCSEL, the fiber transmission distance can reach 300m.
4. OM4 is an upgraded version of OM3 multimode fiber, and the fiber transmission distance can reach 550m.
Basics of design
1.Traditional OM1 and OM2 multimode fibers are based on LED (Light Emitting Diode) in standard and design, while OM3 and OM4 are optimized on the basis of OM2, making them suitable for light sources at the same time LD (Laser Diode laser diode) transmission
2. Compared with OM1 and OM2, OM3 has a higher transmission rate and bandwidth, so it is called optimized multimode fiber or 10G multimode fiber
3. OM4 is optimized on the basis of OM3 and has better performance.
