OPTICAL TRANSMITTER

摘要

An optical transmitter capable of holding the power of an LD at a constant by monitoring the amount of light from the LD on a monitor PD (photo diode) and giving a feedback, characterized in that a recessed groove is provided in a substrate, a monitor PD (photo diode) is installed on the sloped surface of the recessed groove, and the light from the LD installed horizontally opposite to the monitor PD (photo diode) is received directly by the monitor PD (photo diode), whereby the size and cost of the transmitter can be reduced while allowing a large amount of light from the LD to be inputted into the monitor PD (photo diode), and a transmission can be performed at a higher speed.