  The increasing demands of power supply and data rate for mobile devices
promote the research of simultaneous wireless information and power transfer
(SWIPT). Optical SWIPT, as known as simultaneous light information and power
transfer (SLIPT), has the potential for providing high-capacity communication
and high-power wireless charging. However, SLIPT technologies based on
light-emitting diodes have low efficiency due to energy dissipation over the
air. Laser-based SLIPT technologies need strict positioning accuracy and
scanning resolution, which may lead to the increase of costs and complexity. In
this paper, we propose a mobile SLIPT scheme based on spatially separated laser
resonator (SSLR) and intra-cavity second harmonic generation. The power and
data are transferred via separated frequencies, while they share the same
self-aligned resonant beam path, without the needs of receiver positioning and
beam steering. We establish the analysis model of the resonant beam power and
its second harmonic power. Numerical results show that the proposed system can
achieve watt-level battery charging power and above 10-bit/s/Hz achievable rate
at 6-m distance, which satisfies the requirements of most indoor mobile
devices.
