Generation of Stable and High Extinction Ratio Light Pulses for Continuous Variable Quantum Key Distribution


We tend to propose and demonstrate an approach to generate stable and high extinction ratio light-weight pulses with an extinction ratio >80 dB. To this finish, a high stable bias locking technique is proposed, and a little size, easily integrated, cost-effective pulse generator based mostly on delay line chips is meant and made. The heart beat generator can generate voltage >twelve.5 V at a load impedance of 50 , that is enough to drive the lithium niobate-based mostly Mach-Zehnder (LNMZ) intensity modulator with a half wave voltage –8 V. The heartbeat width and delay time will be programmed directly via digital I/O ports. The bias locking technique utilizes a successive scanning and fitting technique which overcomes the sensitivity limit of the photodetector and will achieve the bias voltage accurately and quickly. By this technique, the bias points of 2 or a lot of cascaded LNMZ intensity modulators will be locked stably. The presented system will be simply integrated into the continuous variable quantum key distribution system.

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