In this experiment, a commercial Quantum-Key-Distribution (QKD) system from Toshiba was integrated into a carrier-grade Fiber to the Home (FTTH) optical access network. The setup replicated real-life FTTH deployments with a 1:16 user GPON configuration. The QKD transmission occurred over a total of 4km consisting of two spitting stages. By optimizing transmission powers, a QKD link with 17 kbps Secure Key Rate (SKR) and 4.63% Quantum Bit Error Rate (QBER) was achieved, while maintaining 9 operational ONTs providing high-speed internet services. This successful demonstration showcases the feasibility of QKD over a GPON, enhancing access network security.
In this work, we investigate non-optimized QKD links between arbitrary pairs of Alices and Bobs using off-the-shelf Toshiba QKD devices. Performance variation is observed when connecting unmatched Alices and Bobs, resulting in significantly lower average secret key rates compared to matched pairs. To address this, a novel algorithm is proposed to dynamically balance key consumption rates and optimize the weighted sum of key generation rates while considering system constraints. The evaluation highlights the potential for reducing the required number of QKD pairs from ~N^2 to ~N by utilizing a dynamically switched QKD network.
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