We have conducted an experiment which demonstrates 4 Gb/s operation over 103 km of single-mode optical fiber. Previous transmission experiments have been limited to about 2 Gb/s [1,2,3], in part because this is the highest bit rate for which commercial error-rate measuring equipment is available. We have used a multiplexer and demultiplexer built with discrete GaAs FETs to generate a 4 Gb/s NRZ tat pattern from a 2 Gb/s pseudorandom sequence, and to recover 2 Gb/s for error-rate measurements from the 4 Gb/s receiver output. The 4 Gb/s pattern was used to directly modulate a 154 μm vapor phase transported buried heterostructure (VPTBH) distributed feedback laser [4].

© 1985 Optical Society of America

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