Staas & Halsey LLP
Optical output controller with control based upon an output current of parallel current controlling elements
An optical output controller including a light source emitting light, a light receiving unit receiving some of the emitted light and converting the received light into a current signal, and an automatic power controlling unit receiving the current of the light receiving unit and controlling an optical power output of the light source in accordance with the received current, wherein the automatic power controlling unit includes a resistance circuit section having a variable resistor of which one end is connected to an output end of the light receiving unit, a resistor connected in parallel with the variable resistor, and a load resistor connected in series to the variable resistor and a node providing a predetermined voltage, and a comparison circuit section controlling a driving current of the light source by comparing an output current of the resistance circuit section with a predetermined signal.
Samsung Electronics Co., Ltd.
G
G01J
inventional
Yu-yong
Lee