Research On Aideo Wireless Optical Communication

An audio signals transmission of wireless laser transmission system is designed in this paper, the optical transmitter and receiver is included. The center wavelength of The laser diode of the transmitter is 1550nm , the max operated power of LD is l0mW, and the signal bandwidth of the systerm is 0.2MHz, the working distance could reach lkm. Laser diode with a pigtail output expansion by the beam collimator, its divergence angle had been compressed to 0.15mrad.laser diode is modulated by intensity, and the audio signal is modulated by pulse width modulation (PWM) mode, in the receiver, a simple low-pass filter is used as a demodulateor. the PWM signal. Class D audio amplifier is used in this design, which built-in pulse-width modulator transmitter modulation is to achieve integration. Using a comparator to achieve the signal waveform shaping. the experment in the audio communication is achieved in the lab,the efficiency is perfectly.