A Pulsed Current Type Laser Drive for Laser Simultaneous Wireless Information and Power Transfer

The laser simultaneous wireless information and power transfer (LSWIPT) system is one of the most promising systems in the consumer electronics field. Usually, the output current of the converter driving the laser is pulse mode through closed-loop control to incorporate data into optical power delivery path. In this paper, a pulsed current type laser drive converter with the switching frequency equal to the data modulation frequency is proposed, thus ensuring the converter maintains high efficiency at high data rates. Limited by the physical characteristics of the photovoltaic cell, one of the major challenges of LSWIPT system is that the transmission power and communication rate are mutually constrained. A multi-degree-of-freedom data modulation method is also proposed. Thus, the high power LSWIPT system can achieve increased data rate by combined modulating the amplitude and pulse width of power laser beam. Finally, the simulation results are shown to validate the theoretical analysis and the communication rate reached 200kb/s under high current conditions.