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Photodetector Current Responsivity



In an optical receiver, the unity-gain current responsivity of the photodetector is given by:


Ri =  ------



eta = quantum efficiency (0.5),
e = electronic charge (1.6 x 10-19 C),
h = Planck's constant (6.63 x 10-34 J.s),
f = optical frequency (c/Wl = 4.57 x 1014 Hz),
c = velocity of light (3 x 108 m/s),
Wl = wavelength (656 x 10-9 m).



Substituting the values given above in parentheses into the expression for reception at 656 nm, we find that:


Ri = 0.26 mA/mW

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