ETA Fiber Optics Certification

Light is electromagnetic energy with a _________ frequency and a ________ wavelength compared to radio waves. - Answer-Higher, Shorter What type of light is used in Fiber Optic Transmissions - Answer-Infrared or IR What are the four items needed for a Fiber Optic System to work? - Answer-Transmitter, Fiber Cable, Receiver, Connectors 1mW is the same as what in dBM? - Answer-0 or absolute power How is power measured in fiber? - Answer-mW or dBM Propagation - Answer-light is reflected off a body and is return to its original emission point, the law of propagation for the return trip is the original trip. wavelength - Answer-Horizontal distance between the crests or between the troughs of two adjacent waves Frequency - Answer-the number of complete wavelengths that pass a point in a given time What fiber optic wavelength has the lowest loss? - Answer-1550 um What wavelength windows are used for most communications? - Answer-850, 1330, 1550 What year was the first fiber optic cable used in the communication telephone system? - Answer1977 What light source is used for single mode? - Answer-Laser Diode LD What two light sources are used with multimode? - Answer-Light Emitting Diode (LED) Vertical Cavity Surface Emitting Laser (VCSEL) All wavelengths of light travel at the same speed. True or False - Answer-False Which type of fiber has the largest core size? - Answer-Multi-mode What is OSHA responsible for? - Answer-the identification of various hazards present in the workplace and for the creation of rules and regulations to minimize exposure to such hazards What are two ways to reduce modal dispersion? - Answer-Smaller Core and use graded index fiber