Fiber Installation and Activation Exam |140| questions well answered

Fiber Installation and Activation Exam |140| questions well answered Which standards organization is considered to be the creator of the world's most recognized communications standards, know as "recommendations"? ANS-ITU In which component in a fiber-optics communication system do changes to the intensity of the optical signal occur? ANS-The optical transmitter What is the drawback of using F-P lasers in HSD networks? ANS-The emission of a number of discrete wavelengths or side modes. Why are laser diodes most effective when coupled to a singlemode fiber? ANS-It's high coupled power, directionality. and speed. What are the factors that contribute to an optical receiver's sensitivity? ANS-Noise, responsitivity, response time, linear response, back reflection, and optical detector material. What is a PIN diode? ANS-An optical detector with current flow that is linear to the intensity of light photons, with one electron/hole pair created for every absorbed photon until saturation. What does the amplification process in an APD introduce into the electrical output of an optical detector? ANS-Noise What functions does the detector in an optical receiver perform? ANS-Conversion of an optical carrier to an electrical signal, and demodulation of the modulated optical carrier. What happens if the optical signal exceeds the maximum specified input power into a photodetector? ANS-Nonlinear operation resulting in distortion, data errors, and signal loss. What is a characteristic of light in a laser beam? ANS-The laser beam consists of a limited range of wavelengths (monochromatic), with all light waves in phase (coherent light).