Complex Refractive Index Profile Measurement for Special Fibers Using Total Variation Method

Pei, Li; He, Qian; Wang, Jianshuai; Zheng, Jingjing; Ning, Tigang; Li, Jing

doi:10.1109/jlt.2022.3224078

Cited by 4 publications

(1 citation statement)

References 22 publications

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“…However, this approach demands a highly flat fiber end face and complex operational procedures. The digital holographic method is a high-precision phase imaging technique, multiangle phase information can be captured based on the Mach-Zehnder interferometer, combining computer tomography (CT) to rebuild the RIP of optical fibers, the geometrical parameters can be extracted through the RIP [18][19][20][21][22]. However, for MCFs, the uneven distribution of cores in the cladding prevents precise measurement as the RIP becomes blurred.…”

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confidence: 99%

A Modified Near Field Method for Measuring the Refractive Index Profile and Geometrical Parameters of Multi-Core Fibers

Ma,

Huang,

Yan

2024

J. Lightwave Technol.

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A modified near field (MNF) method is proposed for measuring the refractive index profile (RIP) and geometrical parameters of multi-core fibers. The near field method is based on the near field intensity at the end face of optical fibers that are illuminated by a Lambertian source to get the RIP, but the methods proposed before require a leaky-mode correction factor or additional geometrical parameters to correct the measurement results. The MNF method presented in this paper offers a simplified approach, when the power of the source is constant, the distance between the source and the incident end face of optical fibers is given, and the near field intensity distribution is linear to the RIP of the de-coated optical fibers. By using SMF-28e+® as a sample to obtain the linear coefficient, the proposed method is validated by measuring the RIP of SMF-28R with an accuracy reaching 𝟏𝟎 −𝟒 . Finally, the RIP of 4-core fiber and 7-core fiber are measured by the MNF method accurately and effectively. Also, the geometrical parameters of optical fibers can be extracted through edge extraction and ellipse curve fitting for the distribution of near field intensity. Index Terms-geometrical parameters, multi-core fiber, near field method, optical fiber measurements, refractive index profile. I. INTRODUCTIONITH the continuous reform and innovation of Internet technology, the capacity of traditional single-mode fibers (SMFs) transmission systems can no longer meet the increasing demand for data volume [1,2]. As a solution to the capacity limitation of current optical communication systems, multi-core fibers (MCFs) have gained significant attention because of their unique core distribution and mode field characteristics [3,4]. MCFs are widely used not only in optical communication but also in areas such as sensors [5], measurements [6], and biological fields [7]. Accurate measurements of refractive index profile (RIP) and geometrical parameters play crucial roles in evaluating the capacity of MCFs, as they determine insertion losses, propagation modes, and bandwidths [8][9][10]. Therefore, developing a simple and accurate method for measuring the RIP and geometrical parameters of MCFs is essential, and it is significant for the design and optimization of MCFs, as well as for quality monitoring [11][12][13].Methods for measuring parameters of optical fibers mainly

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confidence: 99%

A Modified Near Field Method for Measuring the Refractive Index Profile and Geometrical Parameters of Multi-Core Fibers

Ma,

Huang,

Yan

2024

J. Lightwave Technol.

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Recent Advancements and Challenges in High‐Power Thulium‐Doped Laser

Sohail,

Li,

Guo

et al. 2024

Adv Materials Technologies

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High‐power all‐fiber thulium lasers have gained considerable interest in recent times due to their distinct characteristics and versatile applications in the medical and industrial sectors. This review article presents a comprehensive examination of the advancements and challenges in this field. It begins with an overview of thulium‐doped silica fiber, which is a critical component for high‐power lasers operating at the 2 µm (micrometer) wavelength band. The research progress of essential high‐power thulium laser sources, including continuous‐wave (CW), quasi‐continuous wave (QCW), and pulsed lasers, is then thoroughly analyzed, highlighting their respective strengths and limitations. Additionally, the diverse applications of high‐power thulium fiber lasers in medical and industrial domains are summarized. Furthermore, the article emphasizes the current challenges in the advancement of high‐power thulium‐doped fiber lasers (TDFLs) and outlines potential avenues for future development. Despite TDFLs being the predominant laser source in lithotripsy and material processing applications, optimizing their performance and expediting further progress in thulium laser technology remain crucial objectives. This review article aims to provide valuable insights for researchers, engineers, and professionals working in the field of high‐power fiber lasers operating at 2 µm.

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The intrinsic mode activation and evolution in fiber splicing based on 3D refractive index profile characterization

He,

Pei,

Wang

et al. 2024

Optics and Lasers in Engineering

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Complex Refractive Index Profile Measurement for Special Fibers Using Total Variation Method

Cited by 4 publications

References 22 publications

A Modified Near Field Method for Measuring the Refractive Index Profile and Geometrical Parameters of Multi-Core Fibers

A Modified Near Field Method for Measuring the Refractive Index Profile and Geometrical Parameters of Multi-Core Fibers

Recent Advancements and Challenges in High‐Power Thulium‐Doped Laser

The intrinsic mode activation and evolution in fiber splicing based on 3D refractive index profile characterization

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