A new design of pulsed laser diode driver system for multistate quantum key distribution

• Main Authors: Abdullah M.S., Jamaludin M.Z., Witjaksono G., Mokhtar M.H.H.
• Other Authors: 16021116200
• Format: Article
• Published: 2023
• Subjects: Quantum key distribution; Six quantum states; Weak coherence laser pulse; Laser pulses; Lasers; Mirrors; MOSFET devices; Quantum chemistry; Quantum cryptography; Quantum theory; Semiconductor diodes; Semiconductor lasers; Biphotons; Constant rate; Current mirrors; Current-mirror circuits; Digital signal controllers; Duty cycles; Laser diode drivers; Laser diodes; Laser driver; Modulation current; MOS-FET; Multi state; New design; Peak currents; Pulsed laser diodes; Quantum state; Semiconductor laser diodes; Pulsed lasers

In this paper, we describe a new design of laser diode driver system based on MOSFET current mirror and digital signal controller (DSC). The system is designed to emit stream pairs of photons from three semiconductor laser diodes. The DSC is able to switch between the three laser diodes at constant rate. The duty cycle is maintained at 1% in order to reduce its thermal effect and thus prolong the laser diodes' life cycles. The MOSFET current mirror circuits are capable of delivering constant modulation current with peak current up to 58 mA to each laser diode. This laser driver system will allow the generating biphotons automatically with qubit rate around 813% for ? less than or equal to 1, thus making it practical for six-states quantum key distribution implementation. � 2010 Elsevier Ltd. All rights reserved.