OM is the abbreviation of optical multi-mode, translated into optical mode, indicating the grade standard of multimode fiber. Due to the difference of core diameter, transmission speed and distance, it is divided into OM1, OM2, OM3 and OM4. This blog ETU-Link will introduce the difference between them and the method of selection to you.

The difference of OM1, OM2, OM3, OM4 fiber patch cord

1. Different parameters

(1) OM1 refers to 50um or 62.5um core diameter multimode optical fiber with full injection bandwidth of 850/1300nm above 200/500MHz.km;

(2) OM2 refers to 50um or 62.5um core diameter multimode optical fiber with full injection bandwidth of 850/1300nm above 500/500MHz.km;

(3) OM3 is a 50um core diameter multimode fiber optimized by 850nm laser. In 10Gb / s Ethernet with 850nm VCSEL, the optical fiber transmission distance can reach 300m;

(4) OM4 is an upgraded version of multi-mode optical OM3 fiber, and the optical fiber transmission distance can reach 550m.

2. Different uses

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

OM3 and OM4 optical cables are usually used in the data center cabling environment, supporting 10g or even 40 / 100g high-speed Ethernet transmission.

3. Different fiber designs

OM1 and OM2 are LED (light emitting diode) as the basic transmission light source, while OM3 and OM4 are suitable for both LED and LD (laser diode) light source transmission.

4. Different transmission speed and bandwidth

The transmission speed and bandwidth of OM optical fiber jumper are increased step by step, OM1

5. Different functions and features

(1) OM1: The core diameter and numerical aperture are large, which have strong light collecting ability and bending resistance;

(2) OM2: The core diameter and numerical aperture are small, which can effectively reduce the mode dispersion of multimode fiber, significantly increase the bandwidth and reduce the production cost by 1/3;

(3) OM3: The flame retardant sheath can prevent the spread of flame, smoke, acid gas and toxic gas, and meet the requirement of 10 GB / s transmission rate

(4) OM4: Developed for VSCEL laser transmission, its effective bandwidth is more than twice that of OM3.

After we understand the differences of different multi-mode fiber patch cord, following ETU-Link will give you some small guidelines for choosing patch cords.

1. Select the correct connector. The connector of optical fiber patch cord has LC / SC / ST / FC / MPO / MTP. If both ends of the equipment have the same interface, we can use LC-LC / SC-SC / MPO-MPO. If the interfaces at both ends of the equipment are different, we can adopt the connection mode of LC-SC/LC-ST/LC-FC.

2. Choose single mode or multimode. Single mode is mainly used for long-distance transmission and multi-mode is mainly used for short-distance transmission. In general, the color of single-mode patch cord is yellow, and that of multi-mode patch cord is orange, aqua and purple.

3. Choose simplex or duplex. Simplex patch cord has only one fiber, which is connected by bi-directional (bidi) optical module. Duplex fiber is two patch cord side by side and connected with common optical module.

4. Select the length of patch cord. The length of optical fiber patch cord is generally 0.5m ~ 50m, which is mainly determined by the distance between equipment and equipment.

The above is what you need to pay attention to when choosing optical fiber patch cord. If you want to inquire about purchasing optical fiber patch cord, welcome to visit our website: www.etulinktechnology.co