Design of laser carrier communication transmitter based on combined modulation

A design of laser carrier transmitter schemes using the combined polarization modulation, PPM and WSK as the modulating method is presented, which permits to obtain a well balance between channel capacity and photon efficiency. A good capability improvement is achieved by employing the circle polarized laser beam. Preliminary results involving combined modulation schemes are introduced and the modulation parameters are confirmed by experiment. An electronics design on laser carrier communication transmitter is also proposed at full length.