Junction temperature is a function of: ambient temperature; current through the LED; amount of heat sinking material in and around the LED 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. To calculate an LED's power use, simply multiply the LED's voltage (in volts) by the LED's current (in amperes). Apparatus 1. This page compares LED vs Laser diode and describes difference between LED and Laser diode. An LED is a junction diode made from semiconductor compound gallium arsenide phosphide. LED I-V Characteristics. Figure 1. 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. Both LED and Laser are used as optical transmitters for various applications. Driving LED light sources above the maximum recommended currents may result in lower lumen maintenance or, with excessive currents, catastrophic failure. 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. The result, measured in watts, is the amount of power your LEDs use. 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. The output current vs. incident light can be linear over 6-9 orders of magnitude. 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. Optical Fiber Communication Experiment Kit 2. When light hits the photodiode a current is generated that flows through R1 to Oscilloscope 4. •Measure I V of LEDs operating in a continuous mode at room tem-perature. •Measure current-versus-voltage characteristics (I V) of LEDs oper-ating in a pulsed mode at different ambient temperatures. The lines can be extended through 0, 0 to show the relationship at negative voltages and currents. LED chips require controlled direct current (DC) electrical power and an appropriate circuit as an LED driver is required to convert the alternating current from the power supply to the regulated voltage direct current used by the LEDs.. 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. Constant Current LED Drivers vs. LED drivers are essential components of LED lamps or luminaries. What is LED. LED Color Characteristics Color quality is an important consideration when evaluating lighting products. 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. AVO meter 5. Wires 6. LED vs Laser diode | Difference between LED and Laser diode. IV curves for various resistors. •Measure spectral power distributions (SPDs) of LEDs for the same driving current, but at different ambient temperatures. 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 power meter 3. For example, if your LED has a voltage of 3.6 and a current of 20 milliamperes, it will use 72 milliwatts of power. 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