Advancing Quantum-Classical Coexistence in Optical Networks

In our latest work, we explore a three-degree ROADM node design that seamlessly integrates C-band classical signals with O-band quantum signals.

🔹 Key Features:
✅ High filtering precision: A band-pass filter (BPF) eliminates out-of-band noise, followed by a band (de)multiplexer to separate and combine quantum and classical channels.
✅ QKD network flexibility: An optical fiber switch (OFS) dynamically routes QKD signals across different node degrees, enabling resource sharing.
✅ Trusted node capabilities: The node can function as a QKD relay or support independent QKD modules for separate quantum key distribution systems.

These innovations pave the way for hybrid optical networks, ensuring secure and scalable quantum communication.

🔎 Want to dive deeper? Check out Figure 10 for the node design and Figure 9(c) for OADM requirements in C-band QCs.

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