Sample interview questions: Can you discuss your knowledge of the principles behind optical wireless communication systems?
Sample answer:
Principles of Optical Wireless Communication Systems
Optical wireless communication (OWC) systems utilize light waves to transmit information through the atmosphere or vacuum. They offer several advantages over traditional radio frequency (RF) systems, including higher data rates, secure communication, and immunity to electromagnetic interference.
OWC systems operate on the principles of free space optics (FSO) or optical fiber.
Free Space Optics (FSO)
FSO systems use directed laser beams or modulated light to transmit data over distances ranging from a few meters to several kilometers. They require line-of-sight connectivity between the transmitter and receiver.
Optical Fiber
Optical fiber systems use thin, flexible glass or plastic fibers to guide light waves. They offer high bandwidth and low loss over long distances.
Key Principles of OWC Systems:
- Modulation: The information is modulated onto the light waves using techniques such as intensity modulation, frequency modulation, or phase modulation.
- Beam Propagation: The light beam propagates through the atmosphere or fiber, subject to atmospheric turbulence, scattering, and fiber attenuation.<... Read full answer