What Is The Difference Between OM1, OM2, OM3 And OM4 Fibers?

What Is The Difference Between OM1, OM2, OM3 And OM4 Fibers?

"OM" stand for optical multi-mode, that is, the optical mode, is a standard for multi-mode fiber to indicate 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.

Comparison of parameters and specifications of OM1, OM2, OM3 and OM4 optical fibers

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;

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

3. OM3 is a 850nm laser-optimized 50um core multimode fiber. In a 10Gb / s Ethernet using 850nm VCSEL, the fiber transmission distance can reach 300m;

OM4 is an upgraded version of OM3 multimode fiber, and the fiber transmission distance can reach 550m.

The design comparison of OM1, OM2, OM3 and OM4 fiber

1. The traditional OM1 and OM2 multimode optical fibers are based on the LED (Light Emitting Diode) method from the standard and design.

The light source base, the OM3 and OM4 are optimized on the basis of OM2, as it applies to the light source LD (Laser Diode laser diode)

transmission;

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

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

Comparison of Functions and Features of OM1, OM2, OM3 and OM4 Optical Fibers

OM1: OM1: The core diameter and numerical aperture are large, and it has strong light-collecting ability and resistance to bending;

2. OM2: Both the core diameter and the numerical aperture are relatively small, which effectively reduces the modal dispersion of the multimode fiber, which significantly increases the bandwidth and reduces the manufacturing cost.

1/3;

3, OM3: The use of flame-resistant outer skin can prevent the spread of flame, prevent the emission of smoke, acid gas and poisonous gas, etc., and meet the transmission rate of 10 gb / s

The need

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

Application comparison of OM1, OM2, OM3 and OM4 fiber

OM1 and OM2 have been widely deployed in building applications for many years, supporting Ethernet transmission up to 1GB;

OM2 and OM4 optical cables are usually used in the data center wiring environment, supporting 10G or even 40 / 100G high-speed Ethernet transmission.

When to use OM3 fiber jumper?

OM3 fiber is an optical fiber designed to work in conjunction with VCSEL. It conforms to the ISO / IEC11801-2nd OM-3 fiber specification and meets 10 Gigabit Ethernet.

Application needs. There are many types of OM3 fiber, including indoor type, indoor / outdoor versatility, etc. The number of fiber cores ranges from 4 to 48 cores. Also supports

There are applications based on the old multimode 50/125 fiber, including support for LED light sources and laser light sources.

1. The transmission distance of Gigabit Ethernet using OM3 optical fiber system can be extended to 900 meters, which means that when the distance between buildings exceeds 550 meters, users

It is not necessary to use expensive laser devices. Zh

2. In the range of 2,000 meters, the OC-12 (622Mb / s) speed range can use standard 62.5 / 125μm multimode fiber.

Outside, single-mode fiber is used. However, the emergence of OM3 multimode fiber has changed this situation, as OM3 fiber can improve the performance of Gigabit and 10G systems.

Distance transmission, an optical module using the wavelength of 850nm and supporting the use of the VCSEL, the most cost effective routing scheme. Zh

3. When the link length exceeds 1000 meters, single-mode fiber is still the only option at present. Single-mode fiber can be used at a wavelength of 1310nm in a gigabit system.

Achieve 5 km transmission distance, transmission distance of 10 km achieved in the Gigabit system.

4. When the link length is less than or equal to 1000 meters, OM3 50 μm multimode fiber can be used in a Gigabit system, and it should be used in a 10 Gigabit system.

Single-mode fiber.

5. When the link length is less than 300 meters, OM3 multimode fiber can be used in any Gigabit and 10 Gigabit systems.

When using OM4 fiber jumpers?

For a typical link, the cost of an optical module is about very expensive. Although the cost of single-mode fiber is cheaper than multimode fiber, but the single-mode optical

Requires the use of expensive fiber 1300nm optical module, which is about 2-3 times the cost of 850nm multimode optical module, the whole, one multimode optical fiber

System much lower cost than single-mode fiber systems.

When investing in fiber optic cabling, if you can consider increasing the initial investment in some cabling, using better multimode fiber, such as OM4 fiber, can ensure that

Permit full advantage of the current multimode optical fiber technology, reducing the overall cost of the current system; when the system needs to be upgraded to a higher rate systems, such as 40G and

100G of time, then you can use any OM4 and more cost effective.

In short, when the transmission rate is greater than 1Gb / s, the use of multimode fiber is a good system choice. When the system needs a higher transmission rate, the following

Here are our guidelines for choosing OM4 fiber:

      1. For Ethernet users, in 10Gb / s system transmission, the transmission distance can reach 300m to 600m; in 40Gb / s and 100Gb / s system, the transmission distance

The distance is between 100m and 125m.

      2. For campus network users, OM4 fiber will support 4Gb / s fiber link length of 400m, 8Gb / s fiber link length of 200m or 16Gb / s fiber link

The length is 130m.

OPTICO COMMUNICATION (www.fiberopticom.com) focuses on the development of fiber optic network communication product lines and provides a comprehensive solution to the fiber connectivity system components. We supply fiber optic components, such as fiber patch cord, fiber pigtail, PLC splitter, fast connector, MTP/MPO, CWDM/DWDM, SFP, FTTH solution, Data center wiring solution, etc. All the products adopt strict quality standards in the production and inspection, ensuring excellent operation performance and good product stability, and safely and reliably ensuring the long-term use of products.

For more details, pls visit OPTICO website: www.fiberopticom.com