Holden W S, Hubbard W M, Personick S D
Appl Opt. 1974 May 1;13(5):1050-2. doi: 10.1364/AO.13.001050.
When the current through the junction of a light emitting diode (LED) is modulated, there is a delay between the modulation and the response of the optical signal to this modulation. We have recently observed that this delay is not the same at different parts of the LED's optical spectrum. This effect, the relative delay between spectral components, we call chromatic delay. This paper reports the results of measurements of chromatic delay for several LED's of various kinds. This effect amounts to delays of the order of 200-300 psec between half power points of the LED spectrum. Thus it establishes a lower limit on the rise time achievable from these devices.
当通过发光二极管（LED）结的电流被调制时，在调制与光信号对该调制的响应之间存在延迟。我们最近观察到，这种延迟在LED光谱的不同部分是不一样的。这种光谱分量之间的相对延迟效应，我们称之为色延迟。本文报道了几种不同类型LED色延迟的测量结果。这种效应导致LED光谱半功率点之间的延迟约为200 - 300皮秒。因此，它确定了这些器件可实现的上升时间的下限。
