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Asia Optical Fiber Communication and Optoelectronics Conference (AOE)

Demonstration of Quadrature-Intensity-Modulation-based Phase-Shifted Optical Quantization

Xin Fu, Hongming Zhang, Zhuangqian Zhang, Minyu Yao

Published Jan 1, 2008• 3 citations
Publisher

Abstract

An improved phase-shifted optical quantization system is demonstrated based on quadrature intensity modulation and non-interferometric light combination. This improved system features simple control and high precision of phase-shifts, while phase-shifts between input microwave signal and output quantization signals is the key issue when implementing a PSOQ system.

DOI
10.1364/aoe.2008.sak13

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An improved phase-shifted optical quantization system is demonstrated based on quadrature intensity modulation and non-interferometric light combination. This improved system features simple control and high precision of phase-shifts, while phase-shifts between input microwave signal and output quantization signals is the key issue when implementing a PSOQ system.
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A scheme of all-optical multilevel phase quantization with high accuracy based on multiwave interference is proposed. The influences of the amplitude ratios of the conjugate (N - 1)th and (N + 1)th harmonics to the signal on phase quantization accuracy are researched. The characteristics of the phase quantization output with the amplitude ratios variation are discovered. By using the proposed scheme, the output phase is more concentrated than that of the traditional method for multilevel phase quantization. The simulations show the effectiveness of the scheme for the three levels quantization and the application of four levels quantization to the quadrature phase shift keying signal regeneration.
Quantum enhanced receivers are endowed with resources to achieve higher sensitivities than conventional technologies. For application in optical communications, they provide improved discriminatory capabilities for multiple non-orthogonal quantum states. In this work, we propose and experimentally demonstrate a new decoding scheme for quadrature phase-shift encoded signals. Our receiver surpasses the standard quantum limit and outperforms all previously known non-adaptive detectors at low input powers. Unlike existing approaches, our receiver only exploits auxiliary coherent-state fields, linear optics, and on-off photo-detection. This circumvents the requirement for challenging feed-forward operations that limit communication transmission rates and can be readily implemented with current technology.
We propose and experimentally demonstrate a phase-sensitive optical processor, capable of generating two codirectional and π-phase-shifted phase-sensitive amplifiers (PSAs) in a single device. Phase-sensitive operation is obtained by polarization mixing a phase-locked signal/idler pair generated in a degenerate dual-pump vector parametric amplifier based on four-wave mixing in a highly nonlinear fiber. We refer to this configuration as a polarization assisted PSA and demonstrate some of the applications that it may find. First, we experimentally demonstrate the regeneration of a binary phase shift keying signal in a system that requires only a very low nonlinear phase shift of 0.35 rad. Second, we decompose a quadrature phase shift keying (QPSK) signal into its in-phase and quadrature components. While application to a QPSK signal is shown in our demonstration, we demonstrate numerically that any complex modulation format signal can be decomposed using this approach. Finally, we use our processor to regenerate QPSK signals in a single nonlinear device.