Optical compound pulse time modulation for analogue fibre transmission

Compound pulse time modulation (CPTM) techniques represent an attractive alternative approach for multiplexing pulse time modulation (PTM) signals. This paper reports an experimental CPTM system based on combining pulse interval modulation and pulse width modulation for transmitting analogue signal over optical fibre cable employing a 1300 nm ELED. Signal to noise ratios of 40 dB have been achieved for the recovered signals depending on modulation conditions.