What is the difference between OM1, OM2, OM3 and OM4 fibers?

2019-03-25

"OM" stand for optical multi-mode, the optical mode, is a standard for multimode fiber to represent fiber grade. The bandwidth and maximum distance are different when transmitting at different levels, and the differences between them are analyzed from the following aspects.

A. Comparison of parameters and specifications of OM1, OM2, OM3 and OM4 fibers

1. OM1 refers to a 50um or 62.5um core-diameter multimode fiber with a full injection bandwidth of 200/500MHz.km at 850/1300nm;

2. OM2 refers to a 50um or 62.5um core-diameter multimode fiber with a full injection bandwidth of 500/500MHz.km at 850/1300nm;

3. OM3 is a 850nm laser-optimized 50um core-diameter multimode fiber. In 10Gb/s Ethernet with 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.

 

 

 

B. the design comparison of OM1, OM2, OM3 and OM4 fiber

1. The traditional OM1 and OM2 multimode optical fibers are based on LED (Light Emitting Diode) as the basis light source, and OM3 and OM4 are optimized on the basis of OM2, making them suitable for light source. For the transmission of LD (Laser Diode laser diode);

2. Compared with OM1 and OM2, OM3 has higher transmission rate and bandwidth, so it is called optimized multimode fiber or 10G multimode fiber;

3. OM4 is re-optimized on the basis of OM3, with better performance.

Third, the function and characteristics of OM1, OM2, OM3 and OM4 fiber

 


C.  OM1: large core diameter and numerical aperture, strong light collecting ability and bending resistance;

2, OM2: core diameter and numerical aperture are relatively small, effectively reducing the mode dispersion of multimode fiber, so that the bandwidth is significantly increased, the production cost is also reduced by 1/3;

3, OM3: the use of flame-retardant skin, can prevent the spread of flame, prevent the emission of smoke, acid gases and toxic gases, and meet the needs of 10 gb / s transmission rate;

4. OM4: Developed for VSCEL laser transmission, the effective bandwidth is more than double that of OM3.

 

  

 

D.  the application comparison of OM1, OM2, OM3 and OM4 fiber

1. OM1 and OM2 have been widely deployed in buildings for many years, supporting Ethernet transmission with a maximum of 1GB;

2, OM3 and OM4 fiber optic cable is usually used in the wiring environment of the data center, supporting the transmission of 10G or even 40/100G high-speed Ethernet road