An APD with a multiplication factor of 20 operates at a wavelength of 1.5 μm. Calculate the quantum efficiency and the output photocurrent from the device if its responsivity at this wavelength is 0.6 A W−1 and 1010 photons of wavelength 1.5 μm are incident upon it per second.

 An APD with a multiplication factor of 20 operates at a wavelength of 1.5 μm. Calculate the quantum efficiency and the output photocurrent from the device if its responsivity at this wavelength is 0.6 A W−1 and 1010 photons of wavelength 1.5 μm are incident upon it per second.

Given, ?=1.5µm, M=20, R=0.64/w, Iph=1010 photon/sec Find, output photocurrent (Ip ), quantum efficiency(?) We know, R= ?e?/hc Where, e=1.6*10-19 c c=3*108 m/s h=6.626*10-34 J.s so, ? = Rhc/e? = 0.6*6