PROJECT TITLE :

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

ABSTRACT:

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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