Design and Fabrication of Single Transverse Mode Passive Large-Pitch Fibers

Bülend Ortaç

doi:10.17776/csj.1632158

TR EN

Tek Enine Modlu Geniş Aralıklı Pasif Fiberlerin Tasarımı ve Üretimi

Öz

We propose and investigate the fabrication processes of single transverse mode passive large-pitch optical fiber (LPF). The LPF design, combined with the fundamental mode operating principle of delocalizing higher-order modes, has led to impressive performance. In this study, two LPF preform designs were proposed based on the stacking of one type of inner glass tube, two (design of LPF1) or three (design of LPF2) different filler rods, and a core rod placed within an outer tube. The first passive LPF1 is fabricated from a single-step preform drawing process. This fiber exhibits single transverse mode propagation, featuring a core size of 45.5 µm and a normalized hole diameter of 0.454. We also demonstrated, for the first time, a single transverse mode of light propagation from an LPF with an elliptical-like hole shape. The second LPF2 design has been proposed and fabricated by using a two-step preform drawing process. Successful production of an LPF with a circular hole shape has been obtained and exhibits single transverse mode propagation, featuring a core size of 42.8 µm and a normalized hole diameter of 0.322. Furthermore, numerical analysis was also performed to study mode propagation for the LPF.

Anahtar Kelimeler

Design and Fabrication of Single Transverse Mode Passive Large-Pitch Fibers

Abstract

The fabrication processes of single transverse mode passive large-pitch optical fiber (LPF) have been proposed and investigated. The LPF design, combined with the fundamental mode operating principle of delocalizing higher-order modes, has led to impressive performance. In this study, two LPF preform designs were proposed based on the stacking of one type of inner glass tube, two (design of LPF1) or three (design of LPF2) different filler rods, and a core rod placed within an outer tube. The first passive LPF1 is fabricated from a single-step preform drawing process. This fiber exhibits single transverse mode propagation, featuring a core size of 45.5 µm and a normalized hole diameter of 0.454. For the first time, a single transverse mode of light propagation from an LPF with an elliptical-like hole shape was achieved. The second LPF2 design has been proposed and fabricated by using a two-step preform drawing process. Successful production of an LPF with a circular hole shape has been obtained and exhibits single transverse mode propagation, featuring a core size of 42.8 µm and a normalized hole diameter of 0.322. Furthermore, numerical analysis was also performed to study mode propagation for the LPF.

Keywords

Supporting Institution

The National Nanotechnology Research Center (UNAM) at Bilkent University

Project Number

113A055

Thanks

Dr. Bülend Ortaç gratefully acknowledges support from TÜBİTAK, the Turkish Academy of Sciences Outstanding Young Scientists (TÜBA-GEBİP), the Young Scientist Awards Program (BAGEP) from the Science Academy, as well as the METU Prof. Dr. Mustafa Parlar Foundation Research Incentive and Feyzi Akkaya Foundation (FABED) Eser Tümen Young Scientist Awards programs. Appreciation is also extended to Dr. Ali Karatutlu, Dr. Esra Kendir Tekgül, Elif Yapar Yıldırım, Ekin Teslime Balk, Ahmet Başaran, and Ahmet Kağan Kolsuz for their fruitful discussions and infrastructural support. Additionally, the author recognizes Seyitali Yaşar and Levent Ersoy at Bilkent University-UNAM for their technical assistance during the drawing process.

References

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Details

Primary Language

English

Subjects

Atomic and Molecular Physics

Journal Section

Research Article

Authors

Bülend Ortaç ^*
0000-0002-1104-7459
Türkiye

Publication Date

March 25, 2025

Submission Date

February 3, 2025

Acceptance Date

March 21, 2025

Published in Issue

Year 2025 Volume: 46 Number: 1

DOI

https://doi.org/10.17776/csj.1632158

IZ

https://izlik.org/JA32PS92HC

Cite

RIS / Bibtex

APA

Ortaç, B. (2025). Design and Fabrication of Single Transverse Mode Passive Large-Pitch Fibers. Cumhuriyet Science Journal, 46(1), 172-178. https://doi.org/10.17776/csj.1632158