Views:45 Author:Fiberall Technology (Shenzhen) Co., Ltd Publish Time: 2020-01-22 Origin:www.fiber-all.com
In optical communication, "OM" refers to "Optical Multi-mode". Currently, there are five fiber patch cord standards defined by TIA and IEC, they are OM1, OM2, OM3, OM4, and OM5.
What is the difference between OM1, OM2, OM3, OM4 and OM5 fiber patch cords?
Generally speaking, OM1 is conventional 62.5/125um; OM2 is conventional 50 / 125um; OM3 is 50/125um multimode fiber optimized by 850nm laser, in the 10Gb/s Ethernet adopted 850nm VCSEL, the transmission distance of OM3 fiber can reach 300 meters; OM4 is the upgraded version of OM3, which optimizes the differential mode delay (DMD) produced by OM3 multimode fiber in high-speed transmission, so the transmission distance has been greatly improved, and the optical fiber transmission distance can reach 550m; OM5 optical fiber jumper is a new standard of fiber patch cord defined by TIA and IEC, it is with 50/125 μm fiber diameter, compared with OM3 and OM4 fiber patch cord, OM5 fiber optic patch cord can be used for higher bandwidth applications.
OM5 fiber is known as broadband multimode fiber (WBMMF), which is a laser optimized multimode fiber (MMF). It is specially designed for wavelength division multiplexing (WDM). The purpose of this new fiber classification method is to provide support for a variety of "short" wavelengths between 850nm and 950nm, which are suitable for high bandwidth applications after aggregation. OM3 and OM4 are designed to support a single wavelength of 850nm.
OM1 and OM2 have been widely deployed in building applications for many years, supporting Ethernet transmission with a maximum value of 1GB; OM3 and OM4 fiber patch cords are usually used in data center cabling, supporting 10G or even 40/100G high-speed Ethernet transmission. OM5 fiber optic jumper is designed for transmission of 40Gb/s to 400Gb/s, including 100GB/s and 200GB/s, which can reduce the number of high-speed transmission fibers.
OM5 multimode fiber optic patch cords are with the following advantages:
1. Less fiber supports higher bandwidth applications:
The operating wavelength of OM5 fiber patch cord is 850/1300nm, and it is able to support at least four wavelengths. The normal operating wavelengths of OM3 and OM4 are 850nm and 1300nm. That is to say, the traditional OM1, OM2, OM3, OM4 multimode fiber has only one channel, while the OM5 has four channels, which improves the transmission capacity by four times. With the combination of SWDM and parallel transmission technology, OM5 only needs 8 cores broadband multimode fiber (WBMMF) to support 200/400G Ethernet, which greatly reduces the number of fiber and the cost of network cabling.
2. Longer transmission distance:
The transmission distance of OM5 fiber optic jumper is longer than that of OM3 and OM4. OM4 fiber is designed to support at least 100 meters in length with a 100g-swdm4 optical transceiver. But the OM5 fiber can support up to 150 meters in length with the same fiber transceiver.
3. Lower fiber loss:
The attenuation of OM5 broadband multimode optical fiber cable is reduced from 3.5 dB/km of OM3 and OM4 to 3.0 dB/km, and the bandwidth requirement of 953nm wavelength is increased. OM5 fiber patch cord has the same fiber size as OM3 and OM4 fiber optic patch cord, which means that it is fully compatible with OM3 and OM4, and it does not need to be changed to apply OM5 in existing cabling. OM5 fiber has more expansibility and flexibility, can support higher speed network transmission with less multimode fiber cores, and its cost and power consumption are far lower than that of single-mode fiber. Therefore, OM5 fiber jumper will be widely used in 100G/400G/1T super large data center in the future.