Optical Fiber Communications(BECE318L)
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A GaAs photodiode has energy bandgap of 1.48eV at roomtemperature. find out cutoff wavelength.
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Electrical bandwidth (Iout/Iin) of LED
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An APD diode has responsivity of about 0.69 A/W, and it is incident with optical power 0.82 µW.. The output multiplied current (IM) is 20µA. Find the multiplication factor of this APD.
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What is the definition of the external quantum efficiency of a semiconductor laser?
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Find the reflectivity of at the emitting surface of a laser which has active region refractive index 3.2 and the light is radiated out in air.
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What is the major difference between the LED and LASER regarding the light output mechanism?
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A photodiode incident with optical power 15 µw. Find the output photo current if the photodiode responsivity is 0.85 A/W.
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What is the limit of detection of a PIN photodiode?
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A multimode graded index fiber exhibits a total pulse broadening of 0.15μs over a distance of 16 km. Estimate the maximum possible bandwidth, assuming no intersymbol interference.
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What are the main functions of the active layers in LED?
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