Modulation format conversion between BPSK and 8QAM signals using coherent interference and four-wave mixing

IF 1.5 4区 物理与天体物理 Q3 PHYSICS, APPLIED Japanese Journal of Applied Physics Pub Date : 2024-06-04 DOI:10.35848/1347-4065/ad4891
Taiga Ishida and Hiroki Kishikawa
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Abstract

Optical fiber networks need to transmit various types of client data with different requirements of bandwidth, reach, latency, and capacity by interconnecting backbone, metro, and local access networks. Since the optimal modulation format usually differs, it should be efficiently converted at the intermediate node connecting different networks. Among the multilevel modulation format, 8-ary quadrature amplitude modulation (8QAM) is a candidate for terrestrial networks thanks to the good balance between spectral efficiency and transmission distance. In this paper, we propose modulation format conversion systems from binary phase shift keying (BPSK) to 8QAM using coherent interference in delay interferometer and its reverse conversion system using four-wave mixing in a single highly nonlinear fiber. Conversion performances are numerically evaluated based on bit error rate, constellation diagrams, 8QAM and BPSK propagation lengths, and parameters in electrical signal regeneration. As a result, error-free format conversion is achieved for both conversion systems.
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利用相干干扰和四波混频实现 BPSK 和 8QAM 信号之间的调制格式转换
光纤网络需要通过连接骨干网、城域网和本地接入网,传输对带宽、覆盖范围、延迟和容量有不同要求的各类客户数据。由于最佳调制格式通常不同,因此应在连接不同网络的中间节点进行有效转换。在多级调制格式中,8 级正交幅度调制(8QAM)在频谱效率和传输距离之间取得了良好的平衡,因此成为地面网络的候选格式。本文提出了利用延迟干涉仪中的相干干扰从二进制相移键控(BPSK)到 8QAM 的调制格式转换系统,以及利用单根高非线性光纤中的四波混频进行反向转换的系统。根据误码率、星座图、8QAM 和 BPSK 传播长度以及电信号再生参数,对转换性能进行了数值评估。因此,两种转换系统都实现了无差错格式转换。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Japanese Journal of Applied Physics
Japanese Journal of Applied Physics 物理-物理:应用
CiteScore
3.00
自引率
26.70%
发文量
818
审稿时长
3.5 months
期刊介绍: The Japanese Journal of Applied Physics (JJAP) is an international journal for the advancement and dissemination of knowledge in all fields of applied physics. JJAP is a sister journal of the Applied Physics Express (APEX) and is published by IOP Publishing Ltd on behalf of the Japan Society of Applied Physics (JSAP). JJAP publishes articles that significantly contribute to the advancements in the applications of physical principles as well as in the understanding of physics in view of particular applications in mind. Subjects covered by JJAP include the following fields: • Semiconductors, dielectrics, and organic materials • Photonics, quantum electronics, optics, and spectroscopy • Spintronics, superconductivity, and strongly correlated materials • Device physics including quantum information processing • Physics-based circuits and systems • Nanoscale science and technology • Crystal growth, surfaces, interfaces, thin films, and bulk materials • Plasmas, applied atomic and molecular physics, and applied nuclear physics • Device processing, fabrication and measurement technologies, and instrumentation • Cross-disciplinary areas such as bioelectronics/photonics, biosensing, environmental/energy technologies, and MEMS
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