A Half-Kilometer, 150 M BIT/SEC. Data Link Experiment Using A Striped-Geometry LED

Eric G. Rawson; Robert E. Norton

doi:10.1117/12.954477

6 November 1975 A Half-Kilometer, 150 M BIT/SEC. Data Link Experiment Using A Striped-Geometry LED

Eric G. Rawson, Robert E. Norton

Proceedings Volume 0063, Guided Optical Communications; (1975) https://doi.org/10.1117/12.954477
Event: 19th Annual Technical Symposium, 1975, San Diego, United States

Abstract

High-speed data links using laser-like LED's, single fiber graded index multimode waveguides, and avalanche photodiodes are described. We describe a new stripe-geometry laser/LED source in which lateral current confinement is achieved by selective diffusion of the n-type substrate prior to the epitaxial growth of the GaAs/GaAlAs layers. Using an H.-P. 3760A/3761A Bit Error Rate system, we observed no errors in a psuedo-random sequence of 1011 bits over a half kilometer fiber at 150 Mbits/sec., the bit rate limit of the H.-P. system. Satisfactory eye diagrams were observed at somewhat higher bit rates. A measurement of the broadening of single laser pulses set an upper limit to the pulse dispersion, for this particular h km fiber, of h nsec/km, which compares to 5 to 25 nsec/km for step-index fibers of similar diameters and index differences. A status report will be presented on an experiment to install a 360 meter cable with six independent waveguide channels thru buried conduit between two laboratory buildings.

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Eric G. Rawson and Robert E. Norton "A Half-Kilometer, 150 M BIT/SEC. Data Link Experiment Using A Striped-Geometry LED", Proc. SPIE 0063, Guided Optical Communications, (6 November 1975); https://doi.org/10.1117/12.954477

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