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Speed ​​of multimode fiber

Fiber and communications infrastructure knowledge brief Published 20 May 2021

Use this reference to prepare product questions for CJC FIBRE. Check interfaces, capacity, protection and installation requirements against the current product documentation.

Multimode fiber can support data rates from 1 Gbps up to 800 Gbps, depending on fiber type, distance, and transceiver technology.

Overview of Multimode Fiber Speeds

Multimode fiber (MMF) has a larger core (50–62. 5 µm) that allows multiple light modes to propagate simultaneously, making it ideal for short- to medium-range connections such as within buildings, data centers, and campus networks. The maximum data rate depends on the fiber type (OM1, OM2, OM3, OM4, OM5) and the distance: OM1 (62.

5 µm core): Supports up to 10 Gbps for very short distances (~33 meters) and is mostly used for legacy 100 Mbps networks. OM2 (50 µm core): Supports 1 Gbps up to 600 meters and 10 Gbps up to 82 meters. OM3 (laser-optimized 50 µm): Supports 10 Gbps up to 300 meters, 40 Gbps and 100 Gbps up to 100 meters.

OM4 (enhanced laser-optimized 50 µm): Supports 10 Gbps up to 550 meters, 40 Gbps up to 150 meters, and 100 Gbps up to 150 meters. OM5 (wideband multimode 50 µm): Designed for shortwave wavelength division multiplexing (SWDM), enabling higher aggregate speeds over similar distances. Modern multimode fiber can achieve data rates up to 800 Gbps using parallel optics and advanced transceivers.

Factors Affecting Speed

Modal Dispersion: Multiple light paths cause pulses to spread out, limiting distance and effective bandwidth. Light Source: LEDs are cheaper but less precise, while VCSELs (vertical-cavity surface-emitting lasers) provide higher speeds and longer reach. Distance: Higher speeds require shorter distances to maintain signal integrity.

For example, 100 Gbps over OM3 is limited to 100 meters, while 10 Gbps can reach 300 meters. Fiber Quality: Laser-optimized fibers (OM3/OM4/OM5) have higher effective modal bandwidth, supporting faster speeds over longer distances.

Practical Applications

Multimode fiber is widely used in data centers, enterprise LANs, and campus networks where high-speed connections are needed over short distances. It is cost-effective compared to single-mode fiber for these applications, as it allows the use of lower-cost transceivers while still supporting multi-gigabit speeds. In summary, multimode fiber provides fast, reliable data transmission for short- to medium-range networks, with speeds ranging from 1 Gbps to 800 Gbps depending on fiber type, distance, and technology used.

Speed ​​of multimode fiber - CJC FIBRE CONSULTANTS [PDF]

Speed ​​of multimode fiber

Multi-mode optical fiber

OverviewApplicationsComparison with single-mode fiberTypesEncircled fluxExternal links

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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