List of top Communication and Optical Instrumentation Questions

A photodiode has a responsivity of \(0.8\) A/W. If the input optical power to the photodiode is \(2\) mW, the power delivered to a \(50\) \(\Omega\) load is \(\mu\text{W}\) (rounded off to the nearest integer).

For a fiber Bragg grating-based sensor, the shift in the Bragg wavelength gives information about the value of the measurand. For a Bragg wavelength of \(1550\) nm and effective index of \(1.44\), the grating period is nm (rounded off to two decimal places).

The slope efficiency of a laser diode is \(0.5\) W/A, and the output optical power at a current of \(100\) mA is \(30\) mW. Assuming piece-wise linear characteristics of the laser diode, the threshold current of the laser is ________ mA.