Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-Efficiency Resonant Beam Charging and Communication   Simultaneous wireless information and power transfer (SWIPT) has been
envisioned as an enabling technology for Internet of Things (IoT) by providing
high-efficiency power transfer and high-rate data transmissions concurrently.
In this paper, we propose a resonant beam (RB) charging and communication
system utilizing the semiconductor gain medium and the telescope internal
modulator (TIM). The semiconductor gain medium has a better energy absorption
capacity compared with the traditional solid-state one, the overall energy
conversion efficiency can be enhanced, while TIM can concentrate the diverged
beam into a small-size gain medium, thus the long-distance separation cavity
for SWIPT can be achieved. We establish an analytical model of this RB system
for SWIPT and evaluate its beam transmission, output energy, and spectral
efficiency. Numerical analysis shows that the proposed RB system can realize
stable SWIPT over 10 meters, whose energy conversion efficiency is increased by
13 times compared with the original system using the solid-state gain medium
without TIM, and the spectrum efficiency can be above 20 bit/s/Hz.

22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg