Subcarrier Modulated Transmission over Silica and Polymer Multimode Fibres

Multimode fibre (MMF) is a suitable medium for constructing a cost-effective converged access network. Compared with single mode fibre the bandwidth of the baseband of MMF is limited. The transmission capacity of MMF can however be increased due to the existence of passbands in the higher frequency region above the-3dB baseband. Multiple subcarrier modulation may explore efficiently the passband characteristics of MMF. In this paper, we demonstrate the transmission of 1.25 Gb/s binary phase shift keying (BPSK) modulated data over 4.4 km 50µm-core- diameter silica MMF and 100 m 50µm-core-diameter graded-index perfluorinated polymer optical fibre (GI POF) by using a single subcarrier channel centered at 3 GHz. Eye diagram and bit error rate measurement results will be presented. Experiments with different subcarrier frequencies indicate the possibility for Subcarrier Multiplexing (SCM) to transport various broadband signals through a common infrastructure with one laser source