Semiconductor device with a laser and a photodetector in a common container

Abstract

A laser and photodetector are combined in a common package. This permits the photodetector to monitor the light intensity emitted by the laser. The laser and photodetector can be produced monolithically on a common chip to improve the accuracy of positioning of the various components. The device can be disposed within a common container having a window through which the emitted light passes. The window can be configured to have inside and outside surfaces that selectively reflect a portion of the light back to the photodetector while transmitting the remaining portion of the light through the window to a phototransmissive device, such as an optical fiber. The light reflected back to the photodetector can be focused in a predetermined pattern to cause the light to be accurately received by the photodetector and not fall on the laser.

Dependencies are inferred from the claim text.