A Transmission Experiment of Multiplexed Asynchronous Signals Using Adaptive Multiplexing Technique

Abstract

It is anticipated that the advent of fiber optic communications will lead to revolutionary concept changes in the field of communications in the coming fiber optic age. Signal multiplexing technology would by no means be exempt from this revolution. Existing multiplexers can only multiplex signals whose clock rate are close to integer multiples of each other. The wide band features of optical fiber can remove such restriction to attain great flexibility in multiplexing asynchronous signals.
Here, we report a new multiplexer using previously reported adaptive run-length transform technology. This unit can adapt to differences in the multiplexing hierarchy. This experimental multiplexer has a maximum of 16 multiplexing channels. A transmission clock of 32 Mb/s and an information carrying capacity of 21 Mb/s. The experimental multiplexer provided errorless transmission. A new frequency locked loop is developed and used in receivers to avoid waveform distortions caused by asynchronous transmission. Jitter is found to be less than 10%, which is satisfactory for practical use.