62.5 In Two Equivalent Forms
Multimode fibers normally refer to l/125μm cobweb and 62.5/125μm fiber. The 50μm and 62.5μm stand for the diameters of the glass or plastic cadre inside the fiber optical cable. The fiber cadre carries the lite which encodes your data. And the 125μm stands for the bore of the cladding, which confines the calorie-free to the core. Here is the cross-department of the two types of multimode fiber optic cables. The difference in the core size will result in dissimilar bandwidths. The smaller cadre size will cause higher bandwidth.
Normally, multimode fiber tin can be divided into OM1 fiber, OM2 fiber, OM3 cobweb, OM4 cobweb and OM5 fiber determined by the ISO 11801 standard. Amidst these fibers, only OM1 cobweb is 62.5/125μm fiber, the other four are 50/125μm fibers. Multimode cobweb enables multiple lite modes to be propagated in the fiber core at a given time. With dissimilar cadre size or bandwidths, the v types of multimode fiber differ in data rate, transmission distance, colour, etc. The smaller a core size is, the higher data rates and transmission distance a fiber cable can reach.
Why Do Nosotros Need to Mix Multimode Optical Fibers?
Normally, lite-emitting diode (LED) lite sources and 62.5μm fiber are used in 10/100Mbps Ethernet. With the need of network upgrading for college rates, the lite source of new technology, vertical-cavity surface-emitting light amplification by stimulated emission of radiation (VCSEL), is required. VCSELs can switch more chop-chop than LEDs, making them improve for higher data rates. And for longer manual distances, 50μm fibers are more adopted than 62.5μm fibers. Therefore, nearly premises installations are now using laser-optimized l/125μm fiber for 1/ten/100 Gigabit Ethernet instead of the legacy 62.v/125μm cobweb. Withal, existing fiber cable systems still employ 62.5µm fibers in many applications, resulting in numerous needs in mixing the 62.5μm and 50μm fibers.
What Problems May Occur in Mixing Multimode Optical Fibers?
There are ii occasions for mixing a 62.5/125µm multimode cobweb and a 50/125µm multimode fiber. One is that the light needs to go into the 62.v/125µm fiber from the l/125µm cobweb, and the other is that the light goes into the 50/125µm cobweb from 62.five/125µm cobweb.
For the get-go case, the smaller core of the 50/125µm cobweb can easily couple to the 62.5/125µm cobweb and is very insensitive to kickoff and angular misalignment. Therefore, nearly no problem will happen. However, one big result, link failing, may occur when upgrading to a 50/125µm multimode fiber from a 62.five/125µm one. When a 62.5/125µm multimode fiber is being mixed with a fifty/125µm multimode fiber, the light in the 62.5/125µm fiber volition escape into the cladding of the 50/125µm multimode fiber, which tin can crusade a coupling loss. If the loss is relatively huge, it is not adequate in mixing the 62.5μm and 50μm fibers.
Then, how to tell the feasibility of the mixed link with a lower coupling loss? Actually, the traditional range of mismatch coupling losses has been covered in several documents such every bit the Cobweb Optic Technicians Manual published by Delmar in August, 2005, stipulating the range from 0.9 dB to one.six dB when mixing the 62.five/125µm multimode fiber and 50/125µm multimode fiber. If the actual loss exceeds the range, information technology is not recommended to mix 62.5μm fibers to 50μm fibers.
Possibility and Reliability on Mixing the 62.5μm and 50μm Fibers
Although in that location is an adequate range of mismatch coupling losses, one can not distinguish how the real losses will exist without actual practices. Given such situations, many tests accept been set up to testify whether the mismatch is reliable in most of the cases.
Several groups of tests connecting the 62.5μm fibers to 50μm fibers from FOA indicate that losses are higher with LEDs than VCSELs and the VCSEL has slightly lower excess loss at xx meters than at either one meter or 520 meters. The tests with LED as the low-cal source were failed because the coupling losses exceeded the acceptable range during 0.ix dB to 1.six dB. The tests with VCSEL as the low-cal source all passed that standard.
In improver to FOA, Corning also made contributions to the possibility and reliability of the mixing betwixt 50µm and 62.5µm multimode fibers. Unlike the FOA, Corning has made several thousands of tests to make the reports more than practical and meaningful. The Corning tests establish no significant coupling losses both in laser sources and 800nm/1300nm LED sources.
Although 50μm and 62.5μm fibers are fully compatible with light amplification by stimulated emission of radiation sources with thousands of tests, manufacture standards, leading media as well as equipment manufacturers recommend that you should not mix unlike types of fiber in a single link. They recommend you to plan for the worst and assume y'all volition encounter a huge loss in one direction. Of form, if you can tolerate that loss, you can mix the 62.5µm fiber with the 50µm fiber straight without hesitation.
Multimode Optical Cobweb Compatibility on Different Bandwidths or Different Manufacturers
Regardless of the fiber compatibility in mixing the 62.5μm and 50μm fibers, multimode optical fiber compatibility of unlike bandwidths or from various suppliers also matters. For example, if you desire to use the legacy 62.5µm fiber and increment the whole network bandwidth without mixing the 50µm fiber, fiber compatibility of different bandwidths is essential. In those applications where mixing fiber bandwidth types are unavoidable, information technology is technically feasible to do so and has been proved past companies like Corning. And the fibers from unlike manufactures are compatible with each other as long as the fibers and links are standards-compliant.
62.5 In Two Equivalent Forms,
Source: https://community.fs.com/blog/multimode-optical-fiber-compatibility.html
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