METHOD AND APPARATUS FOR STABILIZING SIGNAL

摘要

PURPOSE: A method and apparatus are provided to be capable of stabilizing optical signals by returning a voltage signal derived from a receiver to a voltage supply of LED(Lighting Emitting Diode). CONSTITUTION: A line coming from a receiver is connected to a negative terminal of an amplifier, while a positive terminal is connected to a reference voltage. The difference between the reference voltage and the voltage obtained from the receiver is returned to an LED via a resistor(R3). A dropping resistor(R4) is connected in series with the LED, with the resistance value of the dropping resistor increased from 220 ohm to 1200 ohm. In this way, current is supplied to the LED under normal operating conditions via the line of the first amplifier.