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一种基于带有插入导频的马赫曾德尔调制器（MZM）且无码间走离效应的新型32倍频射频光通信（ROF）系统。

A novel frequency 32-tupling ROF system without bit walk-off effect based on MZM with inserting pilot.

作者信息

Chen Xinqiao, Chen Xu, Dai Siyuan, Li Bin, Wang Ling

机构信息

School of Information and Communication Engineering, Communication University of China, Beijing, 100024, China.

出版信息

Heliyon. 2024 Jun 13;10(12):e32871. doi: 10.1016/j.heliyon.2024.e32871. eCollection 2024 Jun 30.

DOI:10.1016/j.heliyon.2024.e32871
PMID:39022086
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11252710/
Abstract

A novel scheme for a frequency 32-tupling millimeter wave (MMW) radio over fiber(ROF) system without the bit walk-off effect is proposed. The operation principle and feasibility of our proposed scheme are theoretically analyzed and verified with simulation experiments. The main part of our scheme is a ±16th order sidebands generator (SG) which is constructed by eight Mach-Zehnder modulators (MZM) connected in parallel. In the back-to-back(BTB) transmission case, by properly adjusting the voltage and initial phase of the radio frequency (RF) drive signals of the MZMs, ±16th order sidebands are generated by the SG. In the data transmission case, the data signal is split into two beams first, one of which modulates the RF drive signal with an electrical phase modulator (PM), and the other is amplified by an electrical gainer (EG), and then the two beams are combined into one and used as the RF drive signal of the MZMs. By adjusting the modulation index of the PM and the gain of the EG, the data signal can be modulated only to the +16th order sideband of the output of the SG. The optical carrier from the CW laser is split into two paths, one is sent into the SG, and the other is used as a pilot. The output signal of SG is combined with the pilot signal and is transmitted to the base station(BS) via optical fiber. In BS, the pilot signal is filtered out by an FBG and used as the carrier for uplink for carrier reuse. After filtering out the pilot, the signal from the FBG which is ±16th order sidebands is injected into the photodetector, and a frequency 32-tupling MMW with downlink data is generated. The influence on the bit error rate (BER) and Q factor by the key parameters in the system is also analyzed. Our scheme can not only effectively overcome the bit walk-off effect caused by optical fiber chromatic dispersion, greatly increase the fiber transmission distance, but also effectively improve the performance of the downlink, it has important application prospects in ROF systems.

摘要

提出了一种用于无码间走离效应的32倍频毫米波光纤无线（ROF）系统的新颖方案。通过仿真实验对所提方案的工作原理和可行性进行了理论分析与验证。该方案的主要部分是一个±16阶边带发生器（SG），它由八个并联的马赫-曾德尔调制器（MZM）构成。在背对背（BTB）传输情况下，通过适当调整MZM的射频（RF）驱动信号的电压和初始相位，SG产生±16阶边带。在数据传输情况下，数据信号首先被分成两束，其中一束用一个电相位调制器（PM）调制RF驱动信号，另一束由一个电增益器（EG）放大，然后这两束光合并为一束并用作MZM的RF驱动信号。通过调整PM的调制指数和EG的增益，数据信号可以仅被调制到SG输出的 +16阶边带上。来自连续波激光器的光载波被分成两路，一路送入SG，另一路用作导频。SG的输出信号与导频信号合并，并通过光纤传输到基站（BS）。在基站中，导频信号被光纤布拉格光栅（FBG）滤除并用作上行链路的载波以供载波重用。滤除导频后，来自FBG的±16阶边带信号被注入到光电探测器中，产生带有下行链路数据的32倍频毫米波。还分析了系统中关键参数对误码率（BER）和Q因子的影响。该方案不仅能有效克服光纤色散引起的码间走离效应，大大增加光纤传输距离，还能有效提高下行链路性能，在ROF系统中具有重要的应用前景。

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本文引用的文献

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Scheme to eliminate the time shift of code edges based on the optimal transmission point of a DP-MZM.
Appl Opt. 2023 Jul 20;62(21):5652-5659. doi: 10.1364/AO.487712.
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Towards 5G: A Photonic Based Millimeter Wave Signal Generation for Applying in 5G Access Fronthaul.迈向5G：一种基于光子学的毫米波信号生成技术在5G接入前传中的应用
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Frequency sixupler for millimeter-wave over fiber systems.用于毫米波光纤系统的频率六倍频器。
Opt Express. 2008 Jul 7;16(14):10141-51. doi: 10.1364/oe.16.010141.