Question: A precise optical signal source can control the output power level to within 1 percent [32]. A laser is controlled by an input current to

A precise optical signal source can control the output power level to within 1 percent [32]. A laser is controlled by an input current to yield the power output. A microprocessor controls the input current to the laser. The microprocessor compares the desired power level with a measured signal proportional to the laser power output obtained from a sensor. Complete the block diagram representing this closed-loop control system shown in Figure El.3, identifying the output, input, and measured variables and the control device.
Figure El.3

i(r) Input Ermor Device Current LaserOutput Measured Sensoir variable

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