ANALYSIS & OPINION: FIBRE & CABLE
NOWADAYS THERE ARE TECHNOLOGIES THAT ENABLE FLEXIBLE AND COMPLETE LIGHT SHAPING THROUGH A SUCCESSION OF VERY COMPLEX OPTICAL LENSES
fundamental centre mode into the multimode fibre core. In this way, the light transmission within
the fibre would no longer induce modal dispersion, as only one mode would propagate, a kind of quasi-single-mode transmission over the multimode fibre. Nowadays, there are technologies that enable flexible and complete light shaping through a succession of very
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complex optical lenses. Such technologies shape a laser beam from a transceiver in such a way that each mode in the fibre can be independently and precisely excited. Tis kind of technology is used as a way
to increase transmission capacity of existing multimode fibres by performing centre launching on legacy multimode fibres. By overcoming speed and distance
limitations, bit rates like 10/25/40/100Gb/s can be carried over an existing legacy multimode infrastructure of several kilometres, allowing for a progressive and flexible evolution of the legacy network optical infrastructure, compatible with any type of 62.5/125μm or 50/125μm multimode fibre.
Geting physical In addition, being that such technologies consist solely of optical elements, the solutions are passive (no energy consumption, no configuration, no monitoring) and operate at the level of the physical layer, which makes them transparent to the wavelength, the communication protocol and modulation format being used. Beyond the increase in bandwidth, it is now
possible to perform the single mode/multimode media converter function in a totally passive way thanks to this modal approach. Indeed, this function can be found in many
cases of use in the LAN, especially in a context of campus extension. It is therefore possible today to achieve the transition without any active layer. As a complement, this modal approach also makes multimode fibres compatible with single mode wavelength- division multiplexing (WDM) technologies, enabling a gradual and flexible increase in network capacity towards very high-speed broadband and thereby ensuring a durable cabling infrastructure. In conclusion, the limited capacity of LAN
cabling infrastructure is a prevalent issue and complex wiring cases are not uncommon. You do not have to remove and replace the old cable by default. You now have the possibility to upgrade legacy multimode fibres. Tese modal adapting passive technological
approaches have already proven their effectiveness across numerous industrial, military, university and hospital campuses around the world. As a complement to traditional cabling, this new trend to transform multimode into single mode fibre makes it possible to recycle the existing cabling infrastructure, one more step towards green IT, with proven benefits for end-customers and ICT professionals. n
Kevin Lenglé is product line manager at Cailabs
Issue 30 n Winter 2021 n FiBRE SYSTEMS 27
Cailabs
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