Bi2O3-based highly nonlinear fiber with step index structure

Tatsuo Nagashima; Tomoharu Hasegawa; Seiki Ohara; Naoki Sugimoto; Kenji Taira; Kazuro Kikuchi

doi:10.1117/12.530639

14 June 2004 Bi₂O₃-based highly nonlinear fiber with step index structure

Tatsuo Nagashima, Tomoharu Hasegawa, Seiki Ohara, Naoki Sugimoto, Kenji Taira, Kazuro Kikuchi

Proceedings Volume 5350, Optical Components and Materials; (2004) https://doi.org/10.1117/12.530639
Event: Integrated Optoelectronic Devices 2004, 2004, San Jose, CA, United States

Abstract

Bismuth oxide based highly nonlinear fiber (Bi-NLF) enabled by glass composition and small core fiber design was successfully fabricated. There's much expectation for the development of high nonlinearity optical devices along with the large volumetric and speed increase of the information traffic in recent years. In order to achieve higher nonlinearity, it is necessary to enlarge the nonlinear refractive index n₂ and make the effective core area Aeff smaller, as g is γ=2πn₂/(λA_eff). Much effort has been put into the development of small-Aeff holey fiber, as its high nonlinearity and dispersion can be controlled to a certain extent. However, holey fiber has issues such as large propagation loss, high connection loss with silica single-mode-fiber (SMF) because of their particular structure, and higher fabrication cost. We performed the fabrication of a conventional step-index-type SMF with high nonlinearity and low propagation loss using Bi₂O₃-based glass. First, we fabricated Bi₂O₃-based glass with high refractive index of >2.2 at 1550 nm by a conventional melting method. This glass exhibited extreme thermal stability for fiber drawing. Then in order to make A_eff smaller, cladding glass composition was designed so that the difference with the refractive index of the core glass must be large. Finally the core diameter was controlled to satisfy the single mode condition, and fiber drawing was performed. Typical A_eff of this fiber is less than 5 um². The nonlinearity g of the fiber can be estimated to be >600 W^-1km^-1, as large as the value reported in holey fibers using non-silica glass. Bi-NLF with step-index-type structure would become the best candidate for short length and highly nonlinear optical devices.

Citation Download Citation

Tatsuo Nagashima, Tomoharu Hasegawa, Seiki Ohara, Naoki Sugimoto, Kenji Taira, and Kazuro Kikuchi "Bi₂O₃-based highly nonlinear fiber with step index structure", Proc. SPIE 5350, Optical Components and Materials, (14 June 2004); https://doi.org/10.1117/12.530639

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