Photodiode module and method of making same

摘要

This invention provides an analog PD module useful for a large number of channels and a digital PD module useful for a large power signal input because of its reduced distortion. The PD chip is fixed at a spot deviating by L tan alpha from the lens center in the direction of a projection of a vector TS from the highest edge (T) to the lowest edge (S), where L is the distance between the lens center and the PD. The fiber should deviate in the contrary direction. The orientation enables a beam emanating from the fiber end to pass the center of the lens and reach the PD by spreading on a direct line.