•Measure spectral power distributions (SPDs) of LEDs for the same driving current, but at different ambient temperatures. This page compares LED vs Laser diode and describes difference between LED and Laser diode. Temperature effects Performance characteristics of LED light sources are specified for a rated current and for an LED die junction temperature of 25°C. Optical Fiber Communication Experiment Kit 2. Driving LED light sources above the maximum recommended currents may result in lower lumen maintenance or, with excessive currents, catastrophic failure. Optical fiber power meter 3. An LED is a junction diode made from semiconductor compound gallium arsenide phosphide. LED Color Characteristics Color quality is an important consideration when evaluating lighting products. LED I-V Characteristics. Both LED and Laser are used as optical transmitters for various applications. AVO meter 5. In the diode, the on-state voltage is 0.7v in case of silicon and 0.3v in case of germanium. For example, if your LED has a voltage of 3.6 and a current of 20 milliamperes, it will use 72 milliwatts of power. A device’s IV curve – current versus voltage curve – is a graph of the current that will flow in the device as a function of the voltage across it. IV curves for various resistors. •Measure current-versus-voltage characteristics (I V) of LEDs oper-ating in a pulsed mode at different ambient temperatures. •Measure I V of LEDs operating in a continuous mode at room tem-perature. An LED operating in an ambient environment at normal room temperature (between 20°C and 25°C) and at manufacturer-recommended currents can have much higher junction temperatures, such as 60°C to 80°C. This fact sheet reviews the fundamentals regarding light and color, summarizing the most important color issues related to white-light LED systems, including color consistency, stability, tuning, and rendering, as well as chromaticity. Apparatus 1. Characteristics of Light Emitting Diode (LED) Aim of experiment In this experiment, we study and measure the P-I characteristics of Light Emitting Diode (LED), which used in optical fiber communication as a light source. When light hits the photodiode a current is generated that flows through R1 to The output current vs. incident light can be linear over 6-9 orders of magnitude. To calculate an LED's power use, simply multiply the LED's voltage (in volts) by the LED's current (in amperes). Before emitting light from any light emitting diode, it needs to have current to flow across it, since LED is a current dependant device with its output light intensity being directly proportional to the forward current passing through the LED. What is LED. Constant current and Constant voltage drivers are both viable options for a power supply for LED light sources, what differs is the way in which they deliver the power. Junction temperature is a function of: ambient temperature; current through the LED; amount of heat sinking material in and around the LED A current to voltage converter (or transimpedance amplifier) is an easy way to convert the photodiode current to a voltage and keep the diode voltage at zero (circuit to the right). Oscilloscope 4. LED drivers are essential components of LED lamps or luminaries. Constant Voltage LED Drivers. Figure 1. Constant Current LED Drivers vs. The result, measured in watts, is the amount of power your LEDs use. Whereas in LED the on-state voltage is approximately lies between 1.2 to 2.0 V. The diode rectifies the alternating current while the LED display the light. LED vs Laser diode | Difference between LED and Laser diode. Wires 6. The lines can be extended through 0, 0 to show the relationship at negative voltages and currents. 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