A: OM1 (62.5/125) Multi mode.
Below are FO 50 / 125 Multi mode
OM2 is 50mm first version
OM3 is 50mm Laser Optimized for higher bandwidth/transmission rates
OM4 is basically OM3 with longer distance capabilities
Note : OS2 is 9/125 single mode
OM1 (62.5/125) should be all but obsolete now save for legacy installations seeing as OM2 offers twice the bandwidth of OM1 and is at a better price-point. OM1's only boast of supporting 10Mb farther than OM2. However, nobody is pushing 10Mb in the backbone these days.
All of OM2, OM3, and OM4 will support 1Gb/s & 10Gb/s. The question you need to ask is how far you plan to run the said protocol. OM3 & OM4 have been optimized for VCSEL-based optical transmission. OM3 is characteristically guaranteed to support 10Gb/s to 300m and OM4 to a minimum of 550m with some mfgs boasting longer distances.
However, with 40G and 100G around the corner, Recommended OM3 at a minimum and OM4 can fit in budget. It could save an upgrade 5-10 years down the road.
OM3 and OM4 Fiber Optic Cable : With each passing year demand for higher data rates in data center environments grow. More and more sophisticated equipment is introduced into the marketplace and more users need access to data center services. Today, we are able to transmit data within the data center at 10 Gig / second using multimode fiber.
While this seems like an enormous transmission rate, user demand will catch up with it fairly quickly. Thankfully technologies are emerging that will allow transfer rates of up to 100 Gig / second in the data center. Also on the horizon are 10 Gig / second data rates to the desktop. As demand for service grows so must the transmission standard. These new increased data rates will require cleaner signals for transmission of laser pulses on multimode fiber.
Introduction of Laser Optimized Fiber
Standard, Non-Laser Optimized Multimode fiber, typically is manufactured with an optical defect in the centre of the core. While this defect is not detrimental to the transmission of light emitted by LED’s, coherent light emitted by lasers is greatly affected. In order to efficiently transmit laser light through multimode cable one must use a mode conditioning cable. These costly patch cables offset the launch of the laser to avoid the center defect. In the early 2000’s optical fiber manufactures began producing fiber without the center defect… Laser Optimized Multimode Fiber was born. OM3 was the first standard to emerge, codifying laser optimization of multimode fiber. This technology was the first to allow designs of laser transmission systems utilizing multimode optical fiber without the use of mode conditioning cables. This new fiber when paired with new low cost Vertical-cavity surface-emitting laser technology allowed for 10 Gig transmission.
OM3 vs OM4
OM4 fiber has been on the market since 2005, sold as premium OM3 or OM3+ fiber. The OM4 designation standardizes the nomenclature across all manufacturers so that the customer has a clearer idea of the product that they are buying. OM4 is completely backwards compatible with OM3 fiber and shares the same distinctive aqua jacket. OM4 was developed specifically for VSCEL laser transmission and allows 10 Gig / second link distances of up to 550 Meters (compared to 300M with OM3).
The effective modal bandwidth for OM4 is more than double that of OM3 (4700 MHz.km for OM4 v/s 2000 MHz.km for OM3).
While OM3 fiber will still be future proof in most applications, allowing speeds of 10GB/s up to 100GB/s, OM4 fiber offers users longer length distances and more wiggle room in optical budgets
For more information on our FO cable pls use below link.