Tag Archives: OM3 fiber

OM1, OM2, OM3, OM4 and OS2 Over Different Networks

During the selection of fiber optic cables or fiber optic patch cords, there is a factor that you must consider which is the fiber type. The most commonly used fiber type in today’s network are multimode fiber optic and single-mode fiber optic. The multimode optical fiber can be further divided into OM1, OM2, OM3 and OM4. For single-mode fiber optic, there are generally two types—OS1 and OS2. Among these different types of fibers, OM1, OM2, OM3, OM4 and OS2 are the most commonly used one.

OM3 patch cords and OS2 patch cords

Fiber Type Is Important to Fiber Optic Network Performance

Apparently different types of the optical fibers provide different performances. Multimode fibers are typically used for inside building or short transmission distances. OM1 and OM2 are the older generation of multimode optical fibers with work well over fast Ethernet and Gigabit Ethernet. However, with the appearance of 10G, 40G and 100G Ethernet coming into being, OM1 and OM2 can no longer provide performance as well as fast Ethernet or Gigabit Ethernet and can not satisfy the transmission distance requirements. That’s why OM3 and OM4 are created. Similarly, the appearance of OS2 is also well explained.

Basic Difference of OM1, OM2, OM3, OM4 and OS2

Generally, OM1 fiber optic cable comes with an orange jacket and has a core size of 62.5 micrometers and is usually used for Gigabit Ethernet transmission in short-haul networks, Local Area Network, and Private Network. OM2 has the same jacket color and similar application as OM1. However, it can has a core size of 50.0 micrometers and support longer transmission distance. Both OM3 and OM4 are both with Aqua jackets and 50.0 micrometers core size and are suggested for 10G, 40G and 100G Ethernet. Now OM1 and OM2 are gradually being replaced by OM3 and OM4. OS2 is the currently widely deployed in our fiber optic network, it has a core size of 9 micrometers.

Specific Performance of OM1, OM2, OM3, OM4 and OS2 Over Different Networks

Not matter what the structure or materials that makes these optical fibers. What we care most is there performance in fiber optic network. Especially factors like transmission distance, wavelength and data rate. For instance, the same type of fiber optic cable will have different performance when working on different data rate or wavelengths. Fiber type plays an important role in the performance of optical communication products like fiber optic transceivers, fiber media converters and DWDM/CWDM MUX/DEMUX. This part will provide several tables which offers the specific performances of the current most popular optical fibers—OM1, OM2, OM3, OM4 and OS2.

OM1 Performance

OM1 Performance
Wavelength
850 nm
1300 nm
Performance
Distances
Loss Budget(dB)
Distances
Loss Budget(dB)
Ethernet
2000m
n/s
n/s
n/s
Fast Ethernet
300m
11
2000m
11
1GbE
275m
3.6
550m
3.6
10GbE
26m
2.6
n/s
2.6
40GbE
n/s
1.9
n/s
1.9
100GbE
n/s
1.9/1.5
n/s
1.9/1.5
Typical Bandwidth
200MHz
500MHz

OM2 Performance

OM2 Performance
Wavelength
850 nm
1300 nm
Performance
Distances
Loss Budget(dB)
Distances
Loss Budget(dB)
Ethernet
2000m
n/s
n/s
n/s
Fast Ethernet
300m
11
2000m
11
1GbE
550m
3.6
550m
3.6
10GbE
82m
2.6
82m
2.6
40GbE
n/s
1.9
n/s
1.9
100GbE
n/s
1.9/1.5
n/s
1.9/1.5
Typical Bandwidth
500MHz
800MHz

OM3 Performance

OM3 Performance
Wavelength
850 nm
1300 nm
Performance
Distances
Loss Budget(dB)
Distances
Loss Budget(dB)
Ethernet
2000m
n/s
n/s
n/s
Fast Ethernet
300m
11
2000m
11
1GbE
550m
3.6
550m
3.6
10GbE
300m
2.6
300m
2.6
40GbE
100m
1.9
n/s
1.9
100GbE
100m
1.9/1.5
n/s
1.9/1.5
Typical Bandwidth
1500MHz
500MHz

OM4 Performance

OM4 Performance
Wavelength
850 nm
1300 nm
Performance
Distances
Loss Budget(dB)
Distances
Loss Budget(dB)
Ethernet
n/s
n/s
n/s
n/s
Fast Ethernet
n/s
11
n/s
11
1GbE
550m
3.6
550m
3.6
10GbE
550m
2.6
550m
2.6
40GbE
150m
1.9
n/s
1.9
100GbE
150m
1.9/1.5
n/s
1.9/1.5
Typical Bandwidth
3500MHz
500MHz

OS2 Performance

OS2 Performance
Wavelength
1310 nm
1550 nm
Performance
Distances
Loss Budget(dB)
Distances
Loss Budget(dB)
Ethernet
n/s
n/s
n/s
n/s
Fast Ethernet
n/s
11
n/s
11
1GbE
5000m
3.6
n/s
3.6
10GbE
10000m
2.6
40000m
2.6
40GbE
10000m
1.9
40000m
1.9
100GbE
10000m
1.9/1.5
40000m
1.9/1.5
Typical Bandwidth
n/a
n/a

Kindly Contact sale@fs.com or visit FS.COM for more details about OM1, OM2, OM3, OM4 and OS2.

Related Article: Migrating to 40/100G With OM3/OM4 Fiber
Related Article: Single Mode vs Multimode Fiber: What’s the Difference?

Migrating to 40/100G With OM3/OM4 Fiber

To meet the continuously increased requirements, data center 40/100G migration is underway. The infrastructure of data centers for the 40G/100G should meet the requirements like high speed, reliability, manageability and flexibility. To meet these requirements, product solutions and the infrastructure topology including cabling must be considered in unison. Cable deployment in the data center plays an important part. The cable used in data center must be selected to provide support for data rate applications not only of today but also the future. Today, two types of multimode fiber—OM3 and OM4 fibers (usually with aqua color)—have gradually become the media choice of data center during 40/100G migration. This article illustrates OM3/OM4 multimode fibers in 40/100G migration in details.

Data Center and Multimode Fibers

Multimode fiber is being widely used in data centers. You might ask why not single-mode fiber? The answer is cost. As is known to all, the price of single-mode fiber is generally more expensive than multimode fiber. In addition multimode fibers provide a significant value proposition when compared to single-mode fiber, as multimode fiber utilizes low cost 850 nm transceivers for serial and parallel transmission. If you had all money you wanted and you’d just run single-mode fiber which has all the bandwidth you need, then you can go plenty of distance. However, this perfect situation would cost a lot of money. Thus, most data center would choose multimode fiber. OM1, OM2, OM3 and OM4 are the most popular multimode fiber. But OM3 and OM4 are gradually taking place of OM1 and OM2 in data centers.

OM

OM stands for optical multimode. OM3 and OM4 are both laser-optimized multimode fibers with 50/125 core, which are designed for use with 850nm VCSELS (vertical-cavity surface-emitting laser) and are developed to accommodate faster networks such as 10, 40 and 100 Gbps. Compared with OM1 (62.5/125 core) and OM2 (50/125 core), OM3 and OM4 can transport data at higher rate and longer distance. The following statistics (850 nm Ethernet Distance) shows the main differences between these four types multimode fibers, which can explain why OM3 and OM4 is more popular in data center now in some extent.

850 nm Ethernet Distance
Fiber Type 1G 10G 40/100G
OM1 300 m 36 m N/A
OM2 500 m 86 m N/A
OM3 1 km 300 m 100 m
OM4 1 km 550 m 150 m

 

Why Use OM3 and OM4 in 40/100G Migration

The Institute of Electrical and Electronics Engineers (IEEE) 802.3ba 40/100G Ethernet Standard was ratified in June 2010. The standard provides specific guidance for 40/100G transmission with multimode and single-mode fibers. OM3 and OM4 are the only multimode fibers included in the standard. The reason why OM3 and OM4 are applied in 40/100G migration is that they can meet the requirements for the migration cabling performance.

Bandwidth, total connector insertion loss and transmission distance are two three main factors should be considered when evaluation the performance needed for cabling infrastructure to meet the requirements for 40/100G. These factors can impact the cabling infrastructure’s ability to meet the standard’s distance of at least 100 meters over OM3 fiber and 150 meters over OM4 fiber. The following explains why OM3/OM4 are the chosen ones for 40/100G migration.

Get Higher Bandwidth With OM3/OM4

Bandwidth is the first reason why OM3 and OM4 are used for 40/100G migration. OM3 and OM4 are optimized for 850nm transmission and have a minimum 2000 MHz∙km and 4700 MHz∙km effective modal bandwidth (EMB). Comparing the OM1 and OM2 with a maximum 500 MHz∙km, advantages of OM3 and OM4 are obvious. With a connectivity solution using OM3 and OM4 fibers that have been measured using the minimum Effective Modal Bandwidth calculate technique, the optical infrastructure deployed in the data center will meet the performance criteria set forth by IEEE for bandwidth.

Get Longer Transmission Distance With OM3/OM4

The transmission distance of fiber optic cables will influence the data center cabling. The manageability and flexibility will be increased with fiber optic cables with longer transmission distance. OM3 fiber and OM4 fiber can support longer transmission distance compare with other traditional multimode fibers. Generally OM3 fibers can run 40/100 Gigabit at 100 meters and OM4 fibers can run 40/100 Gigabit at 150 meters. This high data rate and longer distance cannot be achieved by other traditional multimode fiber like OM1 and OM2. Employing OM3 fiber and OM4 in 40/100G migration is required.

Get Lower Insertion Loss With OM3/OM4

Insertion loss has always been an import factor that technically should consider during the data center cabling. This is because the total connector loss within a system channel impacts the ability to operate over the maximum supportable distance for a given data rate. As total connector loss increased, the supportable distance at that data rate decreases. According to the 40/100G standard, OM3 fiber is specified to a 100m distance with a maximum channel loss of 1.9dB, which includes a 1.5dB total connector loss budget. And OM4 fiber is specified to a 150m distance with a maximum channel loss of 1.5 dB, including a total connector loss budget of 1.0 dB. With low-loss OM3 and OM4 fiber, maximum flexibility can be achieved with the ability to introduce multiple connector mating into the connectivity link and longer supportable transmission distance can be reached.

OM3 or OM4?

Choosing OM3/OM4 is a wise and required choice for data center 40/100G migration. However, OM3 and OM4, which is better? Numerous factors can affect the choice. However, the applications and the total costs are always the main factors to consider to figure out whether OM3 or OM4 is needed.

First, the connectors and the termination of the connectors for OM3 and OM4 fibers are the same. OM3 is fully compatible with OM4. The difference is just in the construction of fiber cable, which makes OM4 cable has better attenuation and can operate higher bandwidth at a longer distance than OM3. Thus, the cost for OM4 fiber is higher than OM3. As 90 percent of all data centers have their runs under 100 meters, choosing OM3 comes down to a costing issue. However, looking in the future, as the demand increases, the cost will come down. Thus, OM4 might be the most viable product at some point soon.

No matter choosing OM3 or OM4, the migration is underway. With good performance like high data rate, long transmission distance and lower inserting loss, OM3/OM4 fiber is a must in data center migration to 40/100G.

Source: http://www.fs.com/blog/om3-and-om4-in-40-100g-migration.html