1. Assume you. have a photodctcctor with a current rcsponsi vity of 5 AJW. A continuous wave HeNe laser with wavelength of 632.8 nm and spot size of 0.5 mm2 is incident on the active area of the detector. Assume that 6.37 x l 021 photons per m! arrive on the detector each second. Calculate the expected photocurrent un der these cond itions.
2. A coaxial cable is used to transmit data with a bandwidth of 100 MHz. Calculate the maxi mum peak Johnson noise power for 300 K and 80 K.