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Laser Driver Lab Report

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and test the actual circuit. 3.4 SIMILAR WORK 3.4.1 Laser driver circuit configurations There different types of Laser driver configurations that are capable of driving the Laser diode. These will be built and tested, to see which one of them will perform better than the other. The function of a Laser driver was mentioned in section 3.2.1.1 of chapter 3. 3.4.1.1 Shunt Driver According to John Senior, this particular circuit is used for digital transmission [27]. The shunt driver uses a field effect transistor (FET). A mosfet is the chosen transistor. The main use of this type of driver is that it is able to provide high speed laser operation. The way this is done is by maintaining enough voltage in series with the laser. Moreover, resistor …show more content…

Each component has a function for the circuit to work. The first capacitor C1 is used to filter out any high frequency noise that is provided from the external DC power supply. The second capacitor C2 is an electrolytic capacitor, that is used to smooth out any fluctuating signals. A ceramic capacitor can also be used to do the same function. The only difference would be between the two capacitors mentioned above is the rated voltage. The rated voltage for a ceramic capacitor is much greater than the electrolytic capacitor. The lifetime of a ceramic capacitor will last longer than the electrolytic capacitor. Lastly, resistor R1 is used to set a limit on the current supplied by the regulator [28]. The reason the resistor is able to keep the current constant is because at the adjustment terminal of the LM317 is connected in parallel with the resistor [28]. This means that the voltage present in the adjustment terminal of the LM317 (1.25V) will be the voltage present across the resistor. The voltage inside the LM317 is able to maintain a nominal voltage of 1.25V, which is considered as the reference voltage [28]. 3.4.1.3 Discrete vs Integrated Laser driver circuits The discrete automatic power control Laser driver circuit is used to supply voltage from 6 to 12 V [29]. A universal operational amplifier is used in this circuit called the OPAMP LM358, with a Zener diode and a transistor. 17 passive components are also used to complete the circuitry and control the output power

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