A new concept for a retrodirective tracking system applicable for communication and power transmission is proposed. In the proposed concept, the power transmitter utilizes a receiver's pilot signal to obtain information about its direction by conjugating the signal's phase inside a nonlinear medium. Power is therefore transmitted back to the receiver by the phase-conjugated signal beam. The power can be concentrated by an array of phase conjugators, which provides a large aperture so that the intensity can be increased on the receiver's photovoltaic panels compared to a single element. Controlling the phase and the direction of the readout beams in the four-wave-mixing process provides control over the interference pattern, its position, and its size.
A numerical analysis is given for the phase and spot size control, and measurements with two Co-doped
© 2007 Optical Society of America
Original Manuscript: December 21, 2006
Revised Manuscript: March 22, 2007
Manuscript Accepted: March 23, 2007
Published: July 6, 2007
Christian A. Schäfer, Osamu Matoba, and Nobuyuki Kaya, "Optical retrodirective tracking system approach using an array of phase conjugators for communication and power transmission," Appl. Opt. 46, 4633-4641 (2007)