16 Using presented in these specifications? (2) Explain. the attached of todiode
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16 Using presented in these specifications? (2) Explain. the attached of todiode and OPV314AT use devices in the compare their spectral p (nm) and An we these Can 17) same optical communications system? (2) Explain. and opv314AT vcsEL laser diode, Using the attached specifica tions of IF-D91 photodiode the values of their modulation bandwidths at 0.48: (1)Can we use these devices in the same optical communications system? (2) Explain. 18) Consider a photodiode, PD: (1) Explain how a photodiode converts input light into photocurrent (2) How is input-output characteristic presented in the attached PD specifications?Explanation / Answer
16.1 Both the photo diode and the laser diode can be used for the same optical communication system
16.2 The peak operating wavelength od the photo diode is from 650nm to 670nm with a bandwidth of 40nm.
From the given graphs of the optical laser, we can conclude that its' operating range is between 640nm nd 670nm with maximum output in the range 640nm and 660nm. The bandwidth here is greater than 40nm.
Since both the operating conditions coincide between the two diodes, they can be used for the same optical communications.
17.1 modultion bandwidth is the range of frequencies with gain more than 3db(50% gain).
modulation bandwidth for the laser diode from the above graph is between 640nm to 660nm [ 1.56KHz to 1.15KHz].
For the photo diode,
modulation bandwidth x power = constant[here k = 0.48]
Substituting the minimum and maximum values of power to get the bandwidth range,
BWmin x 0.000425 = 0.48
BWmin = 1129Hz.
BWmax x 0.00025 = 0.48
BWmax = 1920Hz
17.2 With respective to modulation bandwidths at k=0.48, both the diodes cannot be used for the same application.
18.1 A photo diode operates by the concept of a semiconductor. When a certain voltage is applied across the ends of the diode, the conducting particles move away from the diffusion region emitting light.
18.2 The input-output characteristics of the photo diode are mentioned as peak wvelengths and the power consumed.
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