B.TECH - Semester 7 opto electronic devices Question Paper 2019 (jul)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- Explain stark effect.
- Write notes on radiative recombination rates.
- Define quantum efficiency.
- Describe the principle of quantum well modulators.
- Give a description on Raman Nath modulator.
- Draw the construction of APD.
- What is micro cavity photodiode?
- Explain Avalanche multiplication.
- Write notes on tunable filters.
- Give the function of circulators. Each question carries 20 marks.
- (a) Explain the working principle of laser. 10
- (b) With diagram explain distributed feedback laser and Quantum well lasers. 10
- (a) What is Auger recombination? Derive equation for absorption coefficient of a Semiconductor. 10
- (b) Derive Einsteins relation and explain population inversion. 5
- (c) Write notes on Axial and transverse laser modes? 5 Module - II
- (a) Describe about optical cross connect architecture 12
- (b) Explain optical burst switching and optical packet switching. 8
- (a) Write notes on Stark effect modulators. 10
- (b) Explain the principle and operation of Electro optic modulators. 10 Module - III
- (a) Give the working principle of Photodiode. Compare different types of photo diode. 10
- (b) A PiN photodiode has efficiency $70 \%$ for photons of energy $1.52 \times 10^{-19}$ jules. Calculate wavelength at which diode is operating and the optical power required to achieve a photo current of $3 \mu \mathrm{~A}$ for the wavelength calcu...
- (a) Explain integrated receivers. ..... 5
- (b) Give the structure and application of Schottky barrier photo diode. ..... 5
- (c) Compare hybrid and monolithic integration. ..... 10 Module - IV
- (a) What is the use of wavelength converters? Explain its operation. ..... 8
- (b) Explain the use of directional couplers and define coupling ratio, directivity and isolation. ..... 8
- (c) Write notes on optical isolators. ..... 4
- (a) Write notes on optical add/drop multiplexers. ..... 10
- (b) With diagram explain optical cross connect ..... 10