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Optical Fibers

When it comes to long distance and transmission rate’s performance, optical cabling is the best. It is by far, a better choice than copper cabling. Installation of optical networks follow the same rules as those for buildings, datacenter or MDUs. The optical channel presented at the figure below is an example of performance measurement for any optical solution.

Aiming even higher transmission rates, different multimode fibers MM(50/125μm) were developed, such as OM3, OM4 and more recently OM5. These ibers are compatible with VCSEL, a semiconductor-based laser diode that allows higher taxes of transmission, within distances compatible with local networks. Among the fibers applied in critical environments or with high taxes of data transmission, OM5 should be highlighted, as it is the only one which bandwidth is characterized to be used with SWDW (Short Wavelength Division Multiplexing). The following table shows the performance of multimode optical fibers under the use of SWDM.

OM5 Multimode Fiber
The Wide band multimode optical fiber (WBMMF), optimized for SWDM application

The new generation of the 50 µm multimode fibers, known as OM5, comes to enlarge the performance from previous versions, allowing data traffic in rates such as 40G/100Gbps, for now. Besides being totally compatible with current application of Multimode fibers, the new model was developed in order to support and promote the use of SWDM, which operation and use is explained and depicted as it follows:


In order to establish minimum condition for performance of SWDM technology usage with multimode fibers, it is necessary to establish and determine the bandwidth necessity to transit all used wavelengths. The main differential of the OM5, when comparing with previous fibers, is this characterization.
Currently, the technology SWDM supports 4 wavelengths, that means an improvement of 4 times the transmission rate in face of conventional transmission. OM5 fiber is still under standardization phase, it is still awaiting for the creation of a norm, such as TIA- 942AAAE, to stablish specifications for its specific multimode optical fibers.

Single-Mode Fibers & Non-Zero Dispersion (NZD)

“Low Water Peak” (G.652.D) ---> Metropolitan and access networks.
It enables future expansion of the network for new users via CWDM in up to 16 channels. Fifty percent increase of the transmission capacity in relation to the conventional single-mode fibers. Low attenuation coefficient at the water absorption peak (1383±3 nm), assuring additional use of the E band (1360 to 1460 nm), as well as along the other transmission bands (1270 to 1610 nm)

“Bending Loss Insensitive” (G.657.A ---> FTTH Access networks (Fiber-To-The-Home) and local networks.
Low values of loss, due to curvature, along its entire transmission spectrum, from 1260 to 1625 nm. It allows bending at diameters up to 20 mm generating maximum loss of 0.5 dB at 1625nm and 0.2 dB at 1550 nm.