22.5 Gbps UOWC Using WDM/PolM and OFDM with Interleaved Subcarrier Number Modulation

A 22.5-Gbps UOWC system using WDM/PolM is demonstrated, where OFDM with interleaved sub carrier number modulation (OFDM-ISNM) is proposed to extend the usable bandwidth. Experimental results show a 78.6% bandwidth extension by OFDM-ISNM compared with OFDM.