One of the key challenges in co-propagation Quantum Key Distribution (QKD) is the noise caused by Raman scattering and broadband detector sensitivity. At Allegro, we’re tackling this by improving spectral filtering at the receiver side — a critical step to maximize signal-to-noise ratio (SNR) and overall system performance.
🧪 In our latest work, we explored combinations of narrow-band filters (NBFs) with a 0.25 nm width, along with non-centred bandpass filters (BPFs). This hybrid approach is aimed at reducing out-of-band noise while preserving industrial scalability.
🎯 Key filter characteristics we target:
- High extinction ratio
- Low insertion loss (IL)
- Strong rejection of counter-propagating Raman noise
These advancements are pushing the boundaries of secure QKD deployments in real-world optical networks. Stay tuned for more updates from our Allegro journey!
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