MODE MODULATION IN OPTICAL FIBRE TRANSMISSION. CONVERSION OF ANALOG SIGNALS INTO VARIABLE MODE STRUCTURE
V. I. Adzhalov
A way to extend the applications of fibre-optical multimode transmission systems is based on the nature of light propagation in multimode waveguides, namely, propagation in the form of discrete modes and modal dispersion. The suggestion is to transform the initial signal into a distribution of the modes excited in the fibre. The signal carried by each mode is viewed as a discrete two-state Markov process. The maximum distance of transmission is estimated under mode coupling which is intensified owing to fibre bends. The conditions are evaluated that allow for a correct solution of the maximum transmission length problem. The advantages of time-domain analysis are demonstrated for a signal transmitted as a train of pulses of identical length and amplitude, exciting different numbers of modes.
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