Direct off-air detection, transmission, and tunable bandpass filtering using self-pulsating lasers and substrate antennae

This paper reports for the first time direct off-air detection and transmission from the radio frequency through to the optical domain using a substrate antenna and a self-pulsating laser. The injection-locking property of self-pulsating lasers is exploited and used to lock onto a 1.393-GHz carrier amplitude shift key modulated with 155-Mb/s pseudorandom data. Tunable selection of carriers at 1.409 and 1.630 GHz is demonstrated, with the resultant injection-locked signals being amplified by /spl sim/20 dB.