| 摘要 |
PURPOSE:To design a circuit easily by drawing out two electrodes of a laser diode element and two electrodes of the light-receiving element as four independent external terminals by using a lead and a package. CONSTITUTION:The laser diode element 4 is fixed at the one side of the upper end of a stem 2 through a sub-mount 3, and the element 4 projects laser beams 5 in the vertical direction from upper and lower end surfaces. A photodiode element (the light-receiving element) 6 is fixed to a flange 1 section to which laser beams 5 advancing downward reach, and monitors the light intensity of laser beams 5. The three leads 27, 28, 29 are penetrated and fastened to the flange 1 through insulators, and the element 4 and the element 6 are arranged among these leads and the package 12. Accordingly, the laser diode has the four external terminals composed of the package 12 and the three leads 27, 28, 29, and the drawing out electrodes of each element become independent to each other. |
