B.TECH - Semester 7 optical communication Question Paper 2019 (jul)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- (i) photonic bandgap fiber (ii) hollow core fiber.
- Briefly explain the difference between meridional and skew ray paths in step index fibers.
- What is meant by a graded index optical fiber? Give an expression for the possible refractive index profile.
- Define the normalized frequency for an optical fiber and explain its use in the determination of the guided modes propagating within a step index fiber.
- List the advantages of LED in comparison with injection laser.
- Mention various techniques employed in lens coupling of LEDs to optical fibers.
- What is meant by intensity modulation of an optical source?
- Give the concept of gain clamping in realtion to the operation of an SOA.
- Define the parametric gain.
- Differentiate between connection oriented and connectionless optical networks.
- Define virtual concatenation. Answer any one full questions from each Module. Each question carries 20 marks.
- (a) Using simple ray theory, describe the mechanism for the transmission of light within an optical fiber, Briefly discuss with the aid of a suitable diagram what is meant by the acceptance angle for an optical fiber. Show how this is related to the ...
- (b) Briefly describe linear scattering losses in optical fibers with regard to :
- (i) Rayleigh scattering (ii) Mie scattering.
- (a) Briefly explain the working of
- (b) Describe with the help of simple ray diagrams.
- (i) multimode step index fiber (ii) single mode step index fiber.
- (a) Derive an expression for the responsivity of an intrinsic photodetector interms of quantum efficiency of the device and wavelength of incident radiation.
- (b) Explain the detection process in the $p-n$ photodiode. Compare this device with p-i-n photodiode.
- (a) Describe the mechanism giving the emission of light from laser diodes.
- (b) Discuss the major noise in laser diodes.
- (a) How does the frequency chirp affect the optical output signal. Explain its impact on the output signal of an optical wavelength converter employing semiconductor laser amplifier.
- (b) Compare different types of optical amplifiers in relation to the provision of amplification within optical fiber communication.
- (a) Explain the principle and working of OTDR and how refractive index measurements is done using this.
- (b) Briefly discuss about the design of IMDD links.
- (a) Sketch a functional block diagram for a WDM. Explain the significant role of add/drop multiplexers used in WDM.
- (b) Explain the working of MZ interferometer.
- (a) Explain the formation of solitons in optical fibers.
- (b) Discuss the following terms
- (i) GH effect (ii) soliton - soliton interaction.