engineering recuitment GATE IN Test Series 2023-24 Mock Test Communication Systems Optical Sources and Detector LED
In an LED the radiative and non-radiative lifetime are 60 ns and 120 ns respectively. The peak emission wavelength is 0.87 μm and drive current is 40 mA. If the transmission factor between led and air interface is 0.68. Then the optical power emitted is _______ mW. [Assume refractive index of LED is 3.6]
Enter numerical value using the virtual keypad. Round off where necessary.