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DEStech Transactions on Engineering and Technology Research

Single Light Beam Coherent Optical Communication with Stokes Parameters

Chunhui Huang

Published Nov 18, 2016• 0 citations
Publisher

Abstract

A new mode of coherent optical communication for QKD was proposed in this paper， there are two quadrature Stokes parameters, one is used as observed physical quantity, the other as the carrier wave. The EOM of 45 of azimuth is changed by continuously rotating the HWP, which indirectly complete the linear modulation of 2 S and 3 S parameters. The receiver adopts the Q-Q-H wave plate rotation mode to select the measured 2 S or 3 S . The detection system is built up in combination with LabVIEW to implement the signal demodulation. The results shown that the scheme is feasible.

DOI
10.12783/dtetr/iect2016/3722

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A new mode of coherent optical communication for QKD was proposed in this paper， there are two quadrature Stokes parameters, one is used as observed physical quantity, the other as the carrier wave. The EOM of 45 of azimuth is changed by continuously rotating the HWP, which indirectly complete the linear modulation of 2 S and 3 S parameters. The receiver adopts the Q-Q-H wave plate rotation mode to select the measured 2 S or 3 S . The detection system is built up in combination with LabVIEW to implement the signal demodulation. The results shown that the scheme is feasible.
Based on the encoding requirements of the continuous variable coherent optical communication in the single beam light,a novel encoding scheme by the joint modulation including magneto-optic modulation and electro-optic modulation was proposed.According to the mapping relationship between Stokes parameters and Poincare sphere,the coding principle of the joint modulation is analyzed in Stokes matrix theory.Then a single beam optical system is set up for encoding.And based on the needs of encoding,a driving circuit of magneto-optic modulatior and a circuit of random number generator are designed.By homodyne detection technique,the Stokes parameters are measured,and the error rate is estimated by LabVIEW procedure.The raw data show that the error rate is lower than 3.60%,which verify the feasibility of the encoding scheme.
In this paper， we introduced a system of coherent optical detection with homodyne， which implementing coherent optical communication，our own design based on the principle of coherent optical communication. IN the system, PCI6111E was useed as a data acquisition(DAQ) module. Alice and Bob’s control procedure by their computers under the LabVIEW. The synchronous detection and DAQ were carried out on the system. The signals were processed, displayed and measured. The Experimental results show that by light-synchronization and LabVIEW procedure control, each function module work together in cooperation, include Alice’s acousto-optic modulator and electro-optical modulator, Bob’s data acquisition and phase adjustment by PZT. The coherent optical information could be transitted by Alice and real-time demodulated by Bob.
In this paper, a multiplexing technique of coherent polarization states based on three-dimensional rotation group is proposed. The technique applies two Stokes parameters in one polarized light as signal and local oscillator (LO), and combines them in the single spatial mode. Three-dimensional rotation group SO(3) is used to describe the transformation of Stokes parameters. SO(3) is decomposed into three subgroups, with each subgroup represents a rotation along different axes. A multiplexer is designed with three electro-optical crystals to realize the function of three-dimensional rotation group. The multiplexer achieves an ergodicity of polarization states. Signal and LO propagates in the same spatial mode, multiplexing of polarization states is realized. Finally, the multiplexer is tested in a free space quantum communication system and its feasibility in quantum communication is confirmed.
We propose a new method for performing continuous quantum nondemolition measurements (QNDM) of the polarization characteristics of light, the signal photon number, and the Stokes parameters of light. For devices that implement such measurements we take cubically nonlinear double-filament optical fibers with tunnel coupling of the filaments. Such a system employs a four-mode mixing of the waves (two probe modes and two signal modes). Linear optical elements needed for preliminary and subsequent conversion of the Stokes parameters are also used. We show that measurements of one Stokes parameter can be used for QNDM of the phase difference between the two initial modes. Here the accuracy of such measurements is determined by the initial fluctuations of the Stokes parameters of the probe modes and by the size of the nonlinear mode conversion coefficient in the optical fibers.
The first homodyne receiver for polarization modulated optical signals is proposed and analyzed. It is based on the detection at the receiver of the four quadratures that completely characterize the received optical field and on the estimation of the Stokes parameters starting from them. This allows homodyne detection to be carried out without phase locking the local oscillator to the received signal. An accurate performance evaluation is carried out both at the quantum limit and in the presence of phase noise for a binary system based on an antipodal decision in the Stokes space. The system structure is described. The quantum limit performance is evaluated, and the phase-noise induced penalty is evaluated using an accurate analytical model.>
Nowadays, quantum communications provide a vast field of research in rapid expansion, with a huge potential impact on the future developments of quantum technologies. In particular, continuous variable systems, employing coherent-state encoding and quadrature measurements, represent a suitable platform, due to their compatibility with both the modulation and detection systems currently employed in standard fiber-optical communications. In this work, we address some relevant aspects of the field, and provide innovative results being also experimentally oriented. In particular, we focus on two relevant paradigms: quantum decision theory and continuous variable quantum key distribution (CVQKD). In the former case, we address the problem of coherent-state discrimination and design new hybrid receivers for binary phase-shift keying discrimination, obtaining a quantum advantage over conventional detection schemes, being also robust against typical experimental imperfections. In the latter scenario, we proceed in two different directions. On the one hand, we design new CVQKD protocols employing discrete modulation of coherent states, being a feasible solution compatible with the state of the art in optical communications technologies. On the other hand, we address the more fundamental problem of performing channel losses mitigation to enhance existing protocols, and investigate the role of optical amplifiers for the task. Finally, we make a first step towards a fully non-Gaussian CVQKD scheme by proposing, for the first time, the adoption of an optimized state-discrimination receiver, commonly adopted for quantum decision theory, within the context of CVQKD, obtaining a genuine quantum enhancement over conventional protocols.