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IEEE Student Conference on Research and Development (SCOReD)

Biphoton generation using multistate quantum key distribution technique

Muhammad Syargawi Abdullah, M. Z. Jamaludin, Gunawan Witjaksono, Mohd Hadri Hafiz Mokhtar

Published Dec 1, 2010• 0 citations
Publisher

Abstract

In this paper, we present a method to prepare pairs of photons (biphotons) for multistate quantum key distribution by investigating a pulsed laser diode driver system based on MOSFET current mirror and digital signal controller (DSC). The design is able to emit stream pairs of photons from three semiconductor laser diodes. The DSC is capable 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 cycle. This laser driver system is capable to generate biphotons automatically with bit rate of about 5.5kbps for μ equal to 1.

DOI
10.1109/scored.2010.5703980

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We present a laser source driver using a 130-nm complementary metal oxide semiconductor technology, named quantum laser source driver 2018 (QLSD2018). QLSD2018 drives the optical source with a current pulse signal, and the output of QLSD2018 has an adjustable pulse-width from 300 ps to 3.8 ns and an adjustable amplitude up to 70 mA. The data rate is up to 625 Mb/s, and the extinction ratio of the optical source (the 1550-nm distributed feedback laser or the 850-nm vertical-cavity surface-emitting laser) driven by QLSD2018 can reach 26 dB. The test results indicate that QLSD2018 can be used in quantum key distribution experiments. Using QLSD2018 on the transmitter side can significantly simplify the peripheral circuit of the optical source.