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The standard TIA-598C recommends, for non-military applications, the use of a yellow jacket for single-mode fiber, and orange or aqua for multi-mode fiber, depending on type. [4] Some vendors use violet to distinguish higher performance OM4 communications fiber from other types.
Typical modern multimode graded-index fibers have 3 dB per kilometre of attenuation (signal loss) at a wavelength of 850 nm, and 1 dB/km at 1300 nm. Singlemode loses 0.35 dB/km at 1310 nm and 0.25 dB/km at 1550 nm. Very high quality singlemode fiber intended for long-distance applications is specified at a loss of 0.19 dB/km at 1550 nm. [18]
OM4: Multimode, 50 μm core; minimum modal bandwidth of 4700 MHz·km at 850 nm; OM5: Multimode, 50 μm core; minimum modal bandwidth of 4700 MHz·km at 850 nm and 2470 MHz·km at 953 nm; OS1*: Single-mode, maximum attenuation 1 dB/km at 1310 and 1550 nm; OS1a: Single-mode, maximum attenuation 1 dB/km at 1310, 1383, and 1550 nm
100 m over OM4 multi-mode fiber using PAM-4 at 26.5625 GBd, 70 m over OM3 50GBASE-FR 802.3cd-2018 (139) LC, SC 2 km over single-mode fiber using PAM-4 50GBASE-LR 802.3cd-2018 (139) LC, SC 10 km over single-mode fiber using PAM-4 50GBASE-ER 802.3cd-2018 (139) LC, SC 30 km over single-mode fiber using PAM-4, 40 km over engineered links
For these reasons, single-mode fibers can have a higher bandwidth than multi-mode fibers. Equipment for single-mode fiber is more expensive than equipment for multi-mode optical fiber, but the single-mode fiber itself is usually cheaper in bulk. [citation needed] Cross section of a single-mode optical fiber patch cord end, taken with a fiberscope.
OM4 may refer to: Olympus OM-4, a camera; OM4, a type of multi-mode optical fiber This page was last edited on 28 ...