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Proceedings Paper

Bi2O3-based highly nonlinear fiber with step index structure
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Paper 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/(λAeff). 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 Aeff 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 Aeff 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.

Paper Details

Date Published: 14 June 2004
PDF: 8 pages
Proc. SPIE 5350, Optical Components and Materials, (14 June 2004);
Show Author Affiliations
Tatsuo Nagashima, Asahi Glass Co., Ltd. (Japan)
Tomoharu Hasegawa, Asahi Glass Co., Ltd. (Japan)
Seiki Ohara, Asahi Glass Co., Ltd. (Japan)
Naoki Sugimoto, Asahi Glass Co., Ltd. (Japan)
Kenji Taira, Univ. of Tokyo (Japan)
Kazuro Kikuchi, Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 5350:
Optical Components and Materials
Michel J. F. Digonnet; Shibin Jiang, Editor(s)

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