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Dual-window large-core fiber for high capacity data processing

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Abstract

The design and fabrication of low-loss glass fibers with 100-μm core diam, 140-μm fiber diam, ~0.30 N.A., and 3-dB optical bandwidth of ≥ 20 MHz km has been reported.1 These fibers were fabricated by the outside vapor deposition (OVD) process and had GeO2-SIO2 core and B2O3-SiO2 clad glass compositions. Successful fabrication of blanks of this design utilized the concept of stress balancing2 to minimize breakage due to expansion coefficient mismatch. The fiber was designed for application in the data processing Industry. However, evolution of optical systems for this application over the years has led to a better definition of product needs, and the 50-MHz km bandwidth limit of the quasi-step (α = 3.5) design is no longer considered adequate for high capacity data processing applications. Presently, operating wavelengths of both 800-900 and ∼1300 nm are contemplated. Furthermore, bandwidths In excess of 200 MHz km are considered necessary. To address these application needs, a new large-core high N.A. fiber has been developed. The present paper describes the results of the development program.

© 1982 Optical Society of America

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