Light-emitteddiode (LED) : a semiconductor diode which emits light when a voltage is applied. Commonly used in its short form: LED.
发光二极管：感受电压而发射光线的半导体二极管。
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LED (lightemitteddiode) is now widely used in the field of illuminating engineering as well as information technology, and is expected to be one of the uppermost light sources in the future.
LED光源现今已经广泛应用于照明领域和信息技术领域，而且有希望成为未来最主要的光源之一。
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In this paper, a novel coupler-holographic coupler bet-ween lightemitteddiode (LED) and fiber is proposed. The theoretical, design is carried out. The method and results of design are given.