All those terms refer to the same fibre technology : multimode

Multi-mode optical fiber is a type of fiber primarily used for short-distance communication, such as within buildings or across campuses. It supports data transmission rates of up to 800 Gbit/s. Due to its relatively large core diameter, multi-mode fiber can carry multiple light modes simultaneously. However, this also introduces modal dispersion, which limits the maximum transmission distance. The ITU-T G.651.1 standard defines the most commonly used types of multi-mode optical fiber.

Multimode fiber offers a cost-effective, high-speed connection suitable for short distances up to about 400 meters.

It features a large core, approximately 50 µm in diameter, allowing it to transmit multiple modes of light—typically at 850 nm or 1300 nm wavelengths. This enables high bandwidth over short ranges, but at longer distances, multimode fiber experiences greater dispersion and attenuation, reducing signal quality.

Several categories exist:OM1, OM2, OM3, OM4 and OM5. Depending on the category, specific colour code is used to differentiate easily.