In this paper, some new multiple diode, such as varicap diode, switching diode, diode array, damper diode, modulationdiode and Schottky diode are discussed.
By analyzing the direct frequency modulation and optical feedback effect of laser diode, a theoretical model for measuring small vibration displacement and velocity is discussed.
分析了在直接频率调制下，激光二极管中的光反馈效应，探讨了振动微小位移和速度的理论模型。
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Then, the idea that detecting oxygen concentration by using laser diode wavelength modulation and harmonic signal treatment was proposed.