Optical likelihood calculation for quadrature phase-shift keying signal based on silicon integrated waveguide

IF 2.3 4区 计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Iet Optoelectronics Pub Date : 2022-06-14 DOI:10.1049/ote2.12071
Yohei Aikawa
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Abstract

All-optical likelihood calculation has the potential to improve the performance of operating speed and power consumption in future communication systems. The author previously proposed a novel scheme of likelihood calculation, which is capable of applying multi-value modulation. However, these studies have a limitation that requires higher integration into an actual system. In this study, an optical device of likelihood calculation for a 4-bit quadrature phase-shift keying (QPSK) modulated signal (i.e. two sequential QPSK symbols) is demonstrated. The integrated device consists of two delayed interferometers with silicon waveguide. The device is designed according to the types of 4-bit code string as follows (00 00), (00 11), (11 00), and (11 11), and the output light waveform from the device is observed by an oscilloscope for a plurality of 4-bit QPSK signals. The light intensity obtained from the device accurately corresponds to the Hamming distance between the code string and the input signal. The results indicate that the proposed scheme correctly calculates a likelihood for a 4-bit QPSK signal at 10 Gbaud.

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基于硅集成波导的正交相移键控信号的光学似然计算
全光似然计算在未来通信系统中具有提高运行速度和功耗的潜力。作者提出了一种新的能够应用多值调制的似然计算方案。然而,这些研究有一个局限性,即需要更高的集成到实际系统中。在本研究中,展示了一个4位正交相移键控(QPSK)调制信号(即两个顺序的QPSK符号)的光学似然计算装置。该集成器件由两个带硅波导的延时干涉仪组成。该装置按照如下(00000)、(0011)、(11100)、(1111)4位码串的类型设计,用示波器观察该装置输出的多个4位QPSK信号的光波形。从设备获得的光强度精确地对应于代码串与输入信号之间的汉明距离。结果表明,所提出的方案正确地计算了10gbaud下4位QPSK信号的可能性。
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来源期刊
Iet Optoelectronics
Iet Optoelectronics 工程技术-电信学
CiteScore
4.50
自引率
0.00%
发文量
26
审稿时长
6 months
期刊介绍: IET Optoelectronics publishes state of the art research papers in the field of optoelectronics and photonics. The topics that are covered by the journal include optical and optoelectronic materials, nanophotonics, metamaterials and photonic crystals, light sources (e.g. LEDs, lasers and devices for lighting), optical modulation and multiplexing, optical fibres, cables and connectors, optical amplifiers, photodetectors and optical receivers, photonic integrated circuits, photonic systems, optical signal processing and holography and displays. Most of the papers published describe original research from universities and industrial and government laboratories. However correspondence suggesting review papers and tutorials is welcomed, as are suggestions for special issues. IET Optoelectronics covers but is not limited to the following topics: Optical and optoelectronic materials Light sources, including LEDs, lasers and devices for lighting Optical modulation and multiplexing Optical fibres, cables and connectors Optical amplifiers Photodetectors and optical receivers Photonic integrated circuits Nanophotonics and photonic crystals Optical signal processing Holography Displays
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