Coupling characteristics of nonuniform tapered fiber waveguide for free-space optical communication

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology Pub Date : 2025-09-18 DOI:10.1016/j.optlastec.2025.113910

Baoqun Li , Tianshu Wang , Gang Deng , Shaoqian Tian , Deqi Li , Tianjiao Wu , Sunde Wang , Shutong Liu , Silun Du

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引用次数: 0

Abstract

A high-stability reception scheme for single-mode optical signal based on non-uniform tapered fiber waveguide (NTFW) is proposed and experimentally verified to suppress severe power fluctuation in single-mode optical signal caused by atmospheric turbulence within free-space optical communication (FSO). With the high tolerance characteristic of NTFW in radial misalignment, this scheme significantly reduces the jitter amplitude of the received single-mode laser signal and effectively improves the detection sensitivity of free-space optical communication under turbulent condition. Experimental results show that under atmospheric turbulence condition with coherence length r₀ = 0.657 cm, the detection sensitivity exhibits a positive correlation with the core diameter of the NTFW when the average received power ranges from −15 dBm to −35 dBm. Compared to standard single-mode fiber (SMF), when the bit error rate (BER) reaches the forward error correction limit, the detection sensitivity is improved by 4.367 dB, 12.197 dB, and 15.245 dB using NTFWs with core diameters of 15 μm, 20 μm, and 25 μm, respectively. The research results provide a new approach to enhancing the robustness of single-mode FSO while reducing the accuracy requirements for terminal servo system, demonstrating strong potential for engineering applications.

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自由空间光通信中非均匀锥形光纤波导的耦合特性

提出了一种基于非均匀锥形光纤波导（NTFW）的单模光信号高稳定接收方案，并通过实验验证了该方案能够抑制自由空间光通信（FSO）中大气湍流对单模光信号造成的严重功率波动。利用NTFW对径向失调的高容差特性，该方案显著降低了接收到的单模激光信号的抖动幅度，有效提高了湍流条件下自由空间光通信的探测灵敏度。实验结果表明，在相干长度r0 = 0.657 cm的大气湍流条件下，当平均接收功率在−15 ~−35 dBm范围内时，NTFW的探测灵敏度与芯径呈正相关。与标准单模光纤（SMF）相比，当误码率（BER）达到前向纠错极限时，采用芯径为15 μm、20 μm和25 μm的ntfw，检测灵敏度分别提高4.367 dB、12.197 dB和15.245 dB。研究结果为提高单模FSO的鲁棒性，同时降低终端伺服系统精度要求提供了新的途径，具有较强的工程应用潜力。

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

Optics and Laser Technology 物理-光学

CiteScore

8.50

自引率

10.00%

发文量

1060

审稿时长

3.4 months

期刊介绍： Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems