Multi-mode Fiber

30+ years

Our factory was found in 1992, first start with coaxial cable which was one of the biggest manufacturers in lin'an city.In year of 2001 started focusing on the production of optical cables.

30+ countries

In year of 2008, set up international sales department and sale optical fiber cable to more than 30 countries and have 18 years` rich experience to export cables .

Multimode fiber allows multiple beams of light to propagate simultaneously, resulting in mode dispersion (because each mode enters the fiber at a different angle, and their arrival times at the other end are also different; this characteristic is called mode dispersion). Mode dispersion technology limits the bandwidth and distance of multimode fiber. Therefore, multimode fiber has thick cores, low transmission speed, short distance, and poor overall transmission performance. However, its cost is relatively low compared to other products, and it is generally used in buildings or in environments where they are geographically adjacent.

The first-generation multimode fiber is a 50/125μm multimode fiber with a graded refractive index distribution. The 50μm core diameter is chosen because the number of transmission modes in this fiber is approximately 1/2.5 of that in a 62.5μm multimode fiber. This effectively reduces mode dispersion and increases bandwidth. For an 850nm wavelength, the 50/125μm multimode fiber offers three times the bandwidth of the 62.5/125μm multimode fiber. According to the IEEE 802.3z standard, at a rate of 1Gbit/s, a 62.5μm core diameter multimode fiber can only transmit 270 meters, while a 50μm core diameter multimode fiber can transmit 550 meters. Recent experiments have confirmed that using an 850nm vertical-cavity surface-emitting laser (VCSEL) as the light source, at a rate of 1Gbit/s, standard 50μm core diameter multimode fiber can transmit error-free for 1750 meters (including 5 pairs of connectors), and next-generation 50μm core diameter multimode fiber can transmit error-free for 2000 meters (including 2 pairs of connectors).

Another reason for using a 50μm core diameter is that the advantages of 62.5μm core diameter multimode fiber, which were previously valued, have become irrelevant with technological advancements. In the early to mid-1980s, LED light sources had low output power, large divergence angles, and high connector losses, making the use of fibers with large core diameters and numerical apertures essential for maximizing optical power injection. At that time, it seems no one anticipated that local area network speeds might exceed 100Mbit/s, meaning the bandwidth performance of multimode fiber was not particularly outstanding, especially with the use of VCSELs, where optical power injection was no longer an issue. Core diameter and numerical aperture are no longer as important as before, and the transmission rate of 10 Gbit/s has become the main challenge, making 50 μm core diameter multimode fiber, which can provide higher bandwidth, highly sought after.

FTTH drop cable-Ink printing

Flat cable-Plasma pringting

Outdoor cable GYTC8S-Iron printing

Jumper cable- SC/UPC-SC/APC

GYTC8S 24 core -wooden drum

FTTH cable-1km drum

FTTH cable-carton packing

Patch cords-Pallet package

 

 

Patch cords in Pallet delivery

FTTH cable in cartons packing

Flat cable in plywood drum package

Composite drum full loaded into contianer

Solid wooden drum loading photo

 

 

What are the differences between OM1, OM2, OM3, and OM4 optical fibers?

"OM" stands for optical multimode, a standard for indicating the grade of multimode fiber. Different grades have different bandwidths and maximum transmission distances. This article will mainly explain the differences between OM1, OM2, OM3, and OM4 optical fibers.

I. Parameters and Specifications

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

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

3. OM3 is a 50µm core diameter multimode fiber optimized for 850nm lasers. In 10Gb/s Ethernet using 850nm VCSELs, the fiber transmission distance can reach 300m.

4. OM4 is an upgraded version of OM3 multimode fiber, with a fiber transmission distance of up to 550m.

II. Design Fundamentals

1. Traditional OM1 and OM2 multimode fibers use LEDs (Light Emitting Diodes) as the primary light source in both standards and design. OM3 and OM4, however, are optimized from OM2 to also support transmission using LDs (Laser Diodes).

2. Compared to OM1 and OM2, OM3 offers higher transmission rates and bandwidth, hence the name "optimized multimode fiber" or "10 Gigabit multimode fiber."

3. OM4 is further optimized from OM3, resulting in even better performance.

III. Functions and Features

1. OM1: Larger core diameter and numerical aperture, providing strong light-gathering ability and bending resistance;

2. OM2: Smaller core diameter and numerical aperture, effectively reducing modal dispersion in multimode fiber, significantly increasing bandwidth, and reducing manufacturing costs by one-third;

3. OM3: Employs a flame-retardant outer sheath, preventing flame spread, smoke emission, acidic gases, and toxic gases, while meeting the requirements of 10Gb/s transmission rates;

4. OM4: Developed for VSCEL laser transmission, offering more than twice the effective bandwidth of OM3.

IV. Application Scope

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

2. OM3 and OM4 optical cables are typically used in data center cabling environments, supporting 10G and even 40/100G high-speed Ethernet transmission.

V. When to Use OM3 Fiber Optic Patch Cords?
OM3 fiber optic cables are designed to work with VCSELs and conform to the ISO/IEC 11801-2nd OM-3 fiber optic specification, meeting the requirements of 10 Gigabit Ethernet applications. OM3 fiber optic cables are available in various types, including indoor and indoor/outdoor universal types, with core counts ranging from 4 to 48. They also support all applications based on older multimode 50/125μm fiber optics, including support for LED and laser light sources.

1. Using OM3 fiber optic systems, the transmission distance for Gigabit Ethernet can be extended to 900 meters, meaning that users do not need to use expensive laser devices when the distance between buildings exceeds 550 meters.

2. Within a distance of 2000 meters, standard 62.5/125μm multimode fiber can be used for various situations within the OC-12 (622Mb/s) rate range; otherwise, single-mode fiber is used. However, the emergence of OM3 multimode fiber has changed this situation. Since OM3 fiber can improve the transmission distance of gigabit and 10-gigabit systems, using 850nm wavelength optical modules with VCSELs will be the most cost-effective cabling solution.

3. When the link length exceeds 1000 meters, single-mode fiber remains the only option. Single-mode fiber can achieve a transmission distance of 5 kilometers at a wavelength of 1310nm in gigabit systems and 10 kilometers in 10-gigabit systems.

4. When the link length is less than or equal to 1000 meters, OM3 50μm multimode fiber can be used in gigabit systems, while single-mode fiber should be used in 10-gigabit systems.

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

VI. When to use OM4 fiber optic patch cords?

For a typical link, the cost of optical modules is quite expensive. Although single-mode fiber is cheaper than multimode fiber, its use requires very expensive 1300nm optical modules, which cost approximately 2-3 times more than 850nm multimode optical modules. Overall, the cost of a multimode fiber system is significantly lower than that of a single-mode fiber system.

When investing in fiber optic cabling, considering an initial investment in higher-quality multimode fiber, such as OM4 fiber, can ensure full utilization of current multimode fiber technology and reduce the overall cost of the current system. When the system needs to be upgraded to higher speeds, such as 40G and 100G, OM4 can still be used and will be even more cost-effective.

In short, when the transmission rate is greater than 1Gb/s, using multimode fiber is a good system choice. When the system requires even higher transmission rates, the following are our guidelines for selecting OM4 fiber:

1. For Ethernet users, transmission distances can reach 300m to 600m in 10Gb/s systems; in 40Gb/s and 100Gb/s systems, the transmission distance is 100m to 125m.

2. For campus network users, OM4 fiber will support 400m for 4Gb/s fiber links, 200m for 8Gb/s fiber links, or 130m for 16Gb/s fiber links.

In summary, multimode fiber technology has evolved from OM1 multimode to the current OM5 supporting 40/100Gbps, which will maximize the return on investment for users and make it the best choice for backbone cabling or fiber-to-the-desktop.

ct installation into racks or cabinets, further simplifying cable installation.

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