Optical fiber communication
Previous year question paper with solutions for Optical fiber communication
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- Define spectral efficiency of WDM optical communication systems.
- A photodiode has a quantum efficiency of 50% at a wavelength of 0.9 m. Calculate its responsivity at 0.9 m, Received optical power if the mean photocurrent is 10–6 A, the corresponding number of received photons at this wavelength.
- What are merits & demerits of preamplifiers circuits used in receiver circuits?
- What is the importance of normalized frequency? Define it.
- Give source limitations becoming obstacles in transmitter circuit design.
- Why generally III-V alloys type semiconductor materials are used in fabrications of optical sources?
- What do you understand by material dispersion? How it varies against wavelength for a given composition of optical fiber?
- Define optical receiver sensitivity and give its units also.
- Give importance of DFB lasers used in optical transmitters.
- Describe how bit rate is limited with dispersion and source spectral width.
- Mutual exclusion
- Dynamic loading.
- Scalability.
- Virtual file systems.
- File control block.
- Cache coherence
- I/O traffic.
- PCB.
- Command interpreter.
- Thrashing.
- How BER helps to determine receiver performance?
- Explain briefly fiber coupling losses.
- Draw diagram and explain briefly distributed feedback laser.
- Distinguish between RZ and NRZ modulation format.
- Give details of optical cable construction.
- Nonlinearities are related with intensity- Justify the statement.
- A graded index fiber has a parabolic refractive index profile with 45 m diameter. The numerical aperture is 0.25. Find out the number of guided modes propagating when it is operating at 1.5 m wavelength.
- Using Ray theory describes the mechanism for the propagation of light in an optical fiber.
- Differentiate meridional and skew rays.
- Discuss the concept of negative resistance in APD photo-detector.