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光电子学 is a technical discipline that deals with the interaction between light and electrons. In 光电子学, elements convert electric current into light or vice versa.
光电 devices convert electrical and optical signals back and forth. 由于CMOS器件的普及, both analog and digital signals are most easily processed and stored in electronic form. However, optical signals provide distinct advantages for high-speed and long-distance transmission.
The two key technologies for converting electrical signals to optical are light-emitting diodes (发光二极管) 和激光. led利用流过PN结的电流来发射光子. This junction can be engineered to produce any desired spectrum of light. Lasers also convert electricity into visible light but can produce a coherent, 光谱上更纯净, 更强大的光源. 激光比led需要更多的电力. A laser diode is a device that has qualities of both a laser and an LED. Converting optical signals into electrical signals is accomplished via a photodiode or photovoltaic cell.
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