Simultaneous electrooptical upconversion, remote oscillator generation, and air transmission of multiple optical WDM channels for a 60-GHz high-capacity indoor system

The system concept and data transmission experiments for a mobile broad-ban d communication system at 60 GHz are presented in this paper, Dense wavelen gth division multiplexing (DWDM) is advantageously applied for simultaneous electrooptical upconversion of all optical channels carrying individual in termediate-frequency signals by means of a single external modulator. Thus, simple, but flexible, millimetric signal generation is obtained, Using thi s concept, data transmission experiments at 60 GHz have been carried out. F urthermore, the transponder noise performance is analyzed, Results of coded and uncoded 512-carrier orthogonal frequency division multiplex transmissi on with 50-Mb/s (subcarrier modulation quaternary phase-shift keying), 100 Mb/s (subcarrier modulation 16-quadrature amplitude modulation) as well as single-carrier modulation at 156 Mb/s utilizing three operational DWDM chan nels are presented. Uplink and downlink transmission has been realized. The significant performance improvement due to the application of coding is de monstrated in some experiments and line-of-sight transmission is compared t o nonline-of-sight transmission, Low bit error rates, employing realistic a ir link conditions, have been obtained in all experiments.