Coexistence Demonstration and Wavelength Dependency Analysis of S-Band CV-QKD Signal with Fully Loaded C+L-Band DWDM Signals
We demonstrated the coexistence of an S-band CV-QKD signal with fully loaded C+L-band classical signals for the first time. The secret key rate of the S-band QKD system was 986 kbps with the C+L-band WDM signals transmitted through a 20 km G.654.E fiber link. We also revealed that the S-band CV-QKD...
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MDPI AG
2025-01-01
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| author | Tetsuo Kawakami Hiroki Kawahara Toshihiko Okamura Wakako Maeda |
| author_facet | Tetsuo Kawakami Hiroki Kawahara Toshihiko Okamura Wakako Maeda |
| author_sort | Tetsuo Kawakami |
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| description | We demonstrated the coexistence of an S-band CV-QKD signal with fully loaded C+L-band classical signals for the first time. The secret key rate of the S-band QKD system was 986 kbps with the C+L-band WDM signals transmitted through a 20 km G.654.E fiber link. We also revealed that the S-band CV-QKD performance limiting factor under the C+L-band WDM condition is the spontaneous Raman scattering light similar to the C-band CV-QKD performance limiting factor, confirming the validity of estimating the wavelength dependency of the secret key rate under the WDM condition from the fiber loss and the spontaneous Raman scattering light power. These results show that the CV-QKD performance under the C+L band WDM conditions becomes comparable to that under the C-band WDM conditions by wavelength design in the S-band. |
| format | Article |
| id | doaj-art-b2e9bea556da44418b5f1d8ec8bb7436 |
| institution | Kabale University |
| issn | 1099-4300 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Entropy |
| spelling | doaj-art-b2e9bea556da44418b5f1d8ec8bb74362025-01-24T13:31:47ZengMDPI AGEntropy1099-43002025-01-012714510.3390/e27010045Coexistence Demonstration and Wavelength Dependency Analysis of S-Band CV-QKD Signal with Fully Loaded C+L-Band DWDM SignalsTetsuo Kawakami0Hiroki Kawahara1Toshihiko Okamura2Wakako Maeda3Advanced Network Research Laboratories, NEC Corporation, Kawasaki 211-8666, Kanagawa, JapanAdvanced Network Research Laboratories, NEC Corporation, Kawasaki 211-8666, Kanagawa, JapanAdvanced Network Research Laboratories, NEC Corporation, Kawasaki 211-8666, Kanagawa, JapanAdvanced Network Research Laboratories, NEC Corporation, Kawasaki 211-8666, Kanagawa, JapanWe demonstrated the coexistence of an S-band CV-QKD signal with fully loaded C+L-band classical signals for the first time. The secret key rate of the S-band QKD system was 986 kbps with the C+L-band WDM signals transmitted through a 20 km G.654.E fiber link. We also revealed that the S-band CV-QKD performance limiting factor under the C+L-band WDM condition is the spontaneous Raman scattering light similar to the C-band CV-QKD performance limiting factor, confirming the validity of estimating the wavelength dependency of the secret key rate under the WDM condition from the fiber loss and the spontaneous Raman scattering light power. These results show that the CV-QKD performance under the C+L band WDM conditions becomes comparable to that under the C-band WDM conditions by wavelength design in the S-band.https://www.mdpi.com/1099-4300/27/1/45quantum cryptographyquantum key distributioncontinuous-variable QKDwavelength division multiplexingspontaneous Raman scattering light |
| spellingShingle | Tetsuo Kawakami Hiroki Kawahara Toshihiko Okamura Wakako Maeda Coexistence Demonstration and Wavelength Dependency Analysis of S-Band CV-QKD Signal with Fully Loaded C+L-Band DWDM Signals Entropy quantum cryptography quantum key distribution continuous-variable QKD wavelength division multiplexing spontaneous Raman scattering light |
| title | Coexistence Demonstration and Wavelength Dependency Analysis of S-Band CV-QKD Signal with Fully Loaded C+L-Band DWDM Signals |
| title_full | Coexistence Demonstration and Wavelength Dependency Analysis of S-Band CV-QKD Signal with Fully Loaded C+L-Band DWDM Signals |
| title_fullStr | Coexistence Demonstration and Wavelength Dependency Analysis of S-Band CV-QKD Signal with Fully Loaded C+L-Band DWDM Signals |
| title_full_unstemmed | Coexistence Demonstration and Wavelength Dependency Analysis of S-Band CV-QKD Signal with Fully Loaded C+L-Band DWDM Signals |
| title_short | Coexistence Demonstration and Wavelength Dependency Analysis of S-Band CV-QKD Signal with Fully Loaded C+L-Band DWDM Signals |
| title_sort | coexistence demonstration and wavelength dependency analysis of s band cv qkd signal with fully loaded c l band dwdm signals |
| topic | quantum cryptography quantum key distribution continuous-variable QKD wavelength division multiplexing spontaneous Raman scattering light |
| url | https://www.mdpi.com/1099-4300/27/1/45 |
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