January/February/March 2021 I 13
FIGURE 6: Multimode fiber comparison between perfect center (MPLC) and offset launching.
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to future-proof existing cabling infrastructures
(Figure 6). Because this technology consists solely
of optical elements, it is totally passive (e.g., no energy
consumption, no supervision) and operates at the level
of the physical layer, which makes it transparent to the
communication protocol and modulation format being
used. Due to these features, the MPLC technology makes
it possible to conserve and reuse existing MMF in the
network for implementing the POL.
This technology is used to modify and replace
the singlemode splitter found in a standard POL
architecture and makes existing MMFs compatible
with singlemode OLT and singlemode ONT devices.
It controls modal coupling between the existing
multimode fiber infrastructure and POL singlemode
fibers and devices. The replacement of the singlemode
splitter in a standard POL architecture is called the
modal splitter.
Exposed cables
easily disrupted
Temporary new projector
distance too great for
passive HDMI cable
Theoretical MMF bandwidth
gain according to launching
conditions (extract from
IEEE 802.3aq study)
Perfect center launching
(Multi-Plane Light Conversion)
Offset launching
(Mode conditioning patchcord + Electronic Dispersion Compensation)
Light launching conditions
0
MMF
Bandwidth
gain
