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chapter-qkd/chapter.tex
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@ -723,11 +723,10 @@ along with the key stream output and management links requires one or more class
In a QKD relay node, the key stream never leaves the security envelope. The management and information reconciliation
links can be combined into a single, classical network link, requiring a single fiber when using a standard wavelength
division multiplexing transceiver. The QKD link's clock channel and the quantum channel require a dedicated fiber each,
adding up to a total of five fibers for a uni-directional QKD relay, or nine fibers for a bidirectional one. Since fiber
pigtails have an outer diameter of usually about \qty{1}{\milli\meter}, this amount of fibers can be fed through an
IHSM's axis of rotation. The mechanical challenge in such a multi-fiber signal and data feedthrough is to observe the
fiber's minimum bending radius, which for common fibers is usually in the range of
\qtyrange{5}{15}{\milli\meter}\cite{fs1M12FSC,ProductPageFiber,CorningSMF28Ultra2024}.
adding up to a total of five fibers for a QKD relay. Since fiber pigtails have an outer diameter of usually about
\qty{1}{\milli\meter}, this amount of fibers can be fed through an IHSM's axis of rotation. The mechanical challenge in
such a multi-fiber signal and data feedthrough is to observe the fiber's minimum bending radius, which for common fibers
is usually in the range of \qtyrange{5}{15}{\milli\meter}\cite{fs1M12FSC,ProductPageFiber,CorningSMF28Ultra2024}.
Concluding the above paragraphs, a QKD node is not a particularly challenging payload for an IHSM. The most problematic
requirement is feeding through a number of fibers for its various input and output signals, but fundamentally it is no