Method and system for preventing low order optical transmission modes in multimode optical fiber computer network using annulus laser
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United States of America Patent
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Apr 29, 2003
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app pub date -
May 21, 1998
filing date -
May 21, 1998
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Abstract
A method for improving modal bandwidth in computer networks using multimode optical fiber and laser sources is disclosed in which an annular beam is generate by the laser source, thus preventing center fiber transmission modes from reaching the detector. This prevents or lessens a pulse-splitting effect at the detector. The annular beam is generated preferably by configuring a vertical cavity surface emitting laser to have a center totally-reflecting block of 5-7 microns to generate a substantially dark-centered beam.
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