Abstract
The hybrid digital transmission system, involving 2Rrepeaters between 3R (Reshaping, Retiming and Regenerating)-repeaters, is a suitable system for fiber-optic transmission. The 2R (Reshaping and Regenerating)-repeatered line enables bit rate free transmission, but cannot suppress the accumulated timing jitter in transmitting pulse streams. The trial 1-8 Mbit/s transmission system, using step-index multimode fibers and light emitting diodes, was designed and tested. Multirepeater transmission experiments using optical fiber cable laid in an underground cable tunnel were also performed. The timing jitter accumulations were measured through the multi-repeatered line. Measured timing jitter values were in good agreement with theoretical values. Experimental results show satisfactory feasibility of a fiberoptic hybrid digital transmission system using step-index or gradedindex multimode fibers.
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