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National Conference on Telecommunication Technologies and Malaysia Conference on Photonics (NCTT-MCP)

Plug and Play configuration using two modulator on single Mach-Zehnder Interferometer

Norshamsuri Ali, Hafizulfika, Salim Ali Al-Kathiri, Suhairi Saharudin

Published Aug 1, 2008• 0 citations
Publisher

Abstract

We experimentally demonstrates a two way quantum key distribution (QKD) system with a single Mach Zehnder interferometer over 10 km standard grade optical fiber. The scheme utilizes optical phase encoding/decoding with polarization of photon maintained through the use of polarization maintaining optical fiber at the transmitting and receiving ends and achieves a visibility of 99%.

DOI
10.1109/nctt.2008.4814248

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We experimentally demonstrates a two way quantum key distribution (QKD) system with a single Mach Zehnder interferometer over 10 km standard grade optical fiber. The scheme utilizes optical phase encoding/decoding with polarization of photon maintained through the use of polarization maintaining optical fiber at the transmitting and receiving ends and achieves a visibility of 99%.
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Quantum Key Distribution (QKD) system is capable of generating secrete keys between two parties and enables them to sense the presence of any third party providing unconditionally secure communications. During the development process of constructing the enhanced fully polarized QKD configuration, few problems were confronted and solved. The developed optical structure proved to have auto-compensation in terms of photons polarization because of utilization of polarization maintaining fiber and Faraday mirror. It was also observed that phase coding scheme is implementable for QKD over 100 km long of optical fiber with high visibility, trusted system fidelity and low QBER.
We propose a unidirectional quantum key distribution (QKD) system based upon a time-division Mach–Zehnder interferometer (MZ) using phase stabilized optical fibers (PSOFs) for the sake of achieving the phase stability during the key distribution. A simple comparison between MZs constituent with PSOF and normal single mode fiber (SMF) is made. During the key distribution over 25 km of standard optical fiber, the phase drift of 4.6 × 10 -4 π/s is obtained. We discuss the demonstration of the quantum key distribution when the asymmetric MZ (AMZ) of PSOF is applied on the proposed QKD system.
A one-way quantum key distribution scheme based on intrinsically stable Faraday-mirror-type Michelson interferometers with four-port polarizing beam splitters has been demonstrated that can compensate for birefringence effects automatically. The encoding is performed with phase modulators, but decoding is accomplished through measurement of the polarization state of Bob's photons. An extinction ratio of about 30 dB was maintained for several hours over 50 km of fiber at 1310 nm without any adjustment to the setup, which shows its good potential for practical systems.