Theoretical CDNR analysis on radio-to-optic direct conversion SCM coherent radio-over-fibre system

This paper newly proposes a sub-carrier multiplexing (SCM) coherent radio-over-fibre system using radio-to-optic direct conversion (ROC) scheme, which directly converts multi-carrier radio signals into an optical frequency division multiplexing signal without changing frequency intervals and a signal format. Theoretical analysis of the received carrier-to-distortion-plus-noise-power ratio shows that the proposed radio-to-optic conversion system can provide a larger transmission capacity than the conventional SCM AM or IM system.