Experimental Demonstration of Subband Index Techniques for <inline-formula> <tex-math notation="LaTeX">$m$ </tex-math> </inline-formula>-CAP in Short-Range SI-POF Links

Abstract

In this letter, novel spectrally efficient subband index (SI) techniques have been developed for multiband carrierless amplitude and phase modulation ( $m$ -CAP). The SI techniques transmit additional information bit on the index of the conventional $m$ -CAP subbands. Experimental demonstrations are performed in a short-range optical data link using step-index plastic optical fiber. The demonstrations show that the proposed techniques enable flexibility in design and significantly improve the power/spectral efficiency of the conventional $m$ -CAP.