第二种可能性则能应用在更加耗电的设备上。其原理是发射一道精确聚焦的红外激光线，击中光伏电池，由此能够将光束转换回电能。
A second possibility, for more power-hungry devices, is to fire a finely focused infrared laser beam at a photovoltaic cell, which converts the beam back to electrical energy.
另外介绍了偏振光转换系统的原理以及和光管的耦合。
Principles of the polarization converter and its coupling with the light pipe are discussed.
从理论上分析了各种半导体光放大器波长转换器的转换原理，并给出了它们的各种结构。
The principle of the conversion is theoretically analysed for wavelength converters with semiconductor optical amplifier, and their structures are giver.
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