Small-form-factor Gaussian-modulated coherent-state transmitter for CV-QKD using a gain-switched DFB laser
2023; Optica Publishing Group; Volume: 31; Issue: 4 Linguagem: Inglês
10.1364/oe.474665
ISSN1094-4087
AutoresJennifer Aldama, Samael Sarmiento, S. Etcheverry, Raju Valivarthi, Ignacio H. López Grande, Luis Trigo Vidarte, Valerio Pruneri,
Tópico(s)Advanced Photonic Communication Systems
ResumoWe report a directly modulated distributed feedback laser operating in gain-switching mode for preparing the coherent states required for the Gaussian-modulated coherent-state (GMCS) continuous-variable quantum key distribution (CV-QKD) protocol. The proposed single-component quantum transmitter design eliminates the need for external modulators, decreasing the complexity of GMCS CV-QKD systems. The experimental results demonstrate a potential asymptotic secret key rate value of 2.63 Mbps over an 11-km fiber link, making the directly modulated GMCS transmitter particularly suitable for metropolitan optical networks where compactness, robustness, and low cost are key desirable features.
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