Figure 7
From: Quantum key distribution with hacking countermeasures and long term field trial

Optical performance of (a) isolators and (b) wavelength filters, used to provide protection against Trojan horse attacks.
From: Quantum key distribution with hacking countermeasures and long term field trial
Optical performance of (a) isolators and (b) wavelength filters, used to provide protection against Trojan horse attacks.