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
Photonic crystal fiber, Large-pitch fiber, Large-mode-area, Single transverse mode
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.
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