This paper develops new coding technique to generate multiplexed patterns for Duty-Cycle Division Multiplexing (DCDM) which allows users to share the single transmission medium by assigning different duty cycles for each user. This coding technique aims to reduce the amount of noise which is added due to multilevel signalling. Single channel back-to-back optical fibre system is designed based on the proposed coding technique. The performance analysis is based on the comparison between the proposed pattern with normal DCDM in terms of optical signal-to-noise ratio (OSNR), and receiver sensitivity. The results show that at the optimum performance, DCDM with the proposed pattern is improved by 1.6 dB OSNR and 1.3 dB receiver sensitivity than conventional pattern.
