OM1, OM2, OM3, and OM4 in multimode fibers are always compared. Due to their different parameters, the environments used are also different. This article will focus on these four types of multimode fibers, and make a simplified comparison to grasp the differences more quickly.
1. Comparison of parameters and specifications between the four
【OM1】
Refers to 50um or 62.5um core diameter multimode fiber with 850/1300nm full injection bandwidth above 200/500MHz.km.
【OM2】
Refers to 50um or 62.5um core diameter multimode fiber with 850/1300nm full injection bandwidth above 500/500MHz.km;
【OM3】
It 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;
【OM4】
It is an upgraded version of OM3 multimode fiber, and the fiber transmission distance can reach 550m.
Second, the design comparison between the four
【OM1 and OM2】
The traditional OM1 and OM2 multimode fibers are based on LED (Light Emitting Diode) light sources in terms of standard and design.
【OM3 and OM4】
OM3 and OM4 are optimized on the basis of OM2, making them suitable for transmission of LD (Laser Diode laser diode) as the light source at the same time. Compared with OM1 and OM2, OM3 has higher transmission rate and bandwidth, so it is called optimized multimode fiber or 10 Gigabit multimode fiber.