Apodized fiber Bragg grating filters for efficient QKD channel separation in QKD-over-DWDM systems
Namwook Joe, Taeho Woo, Suckwoo Shin, Kyungtaek Lee, Ju Han Lee · 2026
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Description
Joe and colleagues modeled optical filters in 2026 for running quantum key distribution, a secrecy method using single photons, inside the same fiber as ordinary dense data channels. The quantum channel sits at 1310 nanometers while heavy classical traffic runs at 1550, and stray classical light swamps the faint quantum signal. They compared three filter setups, scoring each on error rate, secret key rate, and how far the quantum link can reach.
A Gaussian-shaped fiber Bragg grating, a filter etched into the fiber itself, gave the best separation, with isolation near 93 decibels between the two wavelengths. With 50 classical channels running, that setup stretched the quantum link to 35.4 kilometers, against only 18.3 kilometers for two cascaded conventional filters in the same model. A raised-cosine grating improved isolation further but barely moved the distance, the authors found for this band pairing.
Catalog record
| CREATOR | Namwook Joe, Taeho Woo, Suckwoo Shin, Kyungtaek Lee, Ju Han Lee |
|---|---|
| YEAR | 2026 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 87 KB |
| VERSION | 1.0 |
| LICENSE | CC BY 4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |