The key benefit of using a passive
mean of compensation is that it can compensate for all small-scale vibrations no matter
what their frequency and vibration characteristics are.
It is, therefore, often desirable to use FSO systems with sufficiently large divergence to
compensate for fast movements, combined with simple automated tracking to compensate
for large-scale mispointing. However, even though both passive and active means can
compensate for mispointings, there is still a need for a solid foundation for installing an
FSO system. Having solid foundations can only make the link more reliable.
Regardless of whether tracking is used to compensate for fast movements or slow movements,
the underlying technology is a very mature technology. The limitation of tracking is
not about developing a new technology but instead about making it commercially viable.
Slow tracking systems are significantly more cost-effective than fast tracking systems.
Understanding Link Margin and Atmospheric Effects
Before considering FSO for deployment as a viable technology, it is important to understand
how atmospheric effects affect FSO links and their impact on the link margin of
FSO systems.
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