Exam Details
| Subject | Optical Fiber Communication | |
| Paper | ||
| Exam / Course | BTCVI / BTECVI / BTELVI | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | December, 2016 | |
| City, State | new delhi, |
Question Paper
A graded index fiber with a core axis refractive index of 1·5 has a characteristic index profile of 1·90, a relative refractive index difference of 1·3% and a core diameter of 40 m. Estimate the number of guided modes when the transmitted light has a wavelength of 1.55 m.
With the help of a neat diagram, explain the block· diagram of an optical fiber communication system.
2. Explain what is meant by the critical bending radius for an optical fiber. A multimode graded index fiber has a core refractive index of 1·46 with the cladding refractive index of 1·45. The critical radius of curvature which allows large bending losses to occur is 84 JUD.. Determine the wavelength of the transmitted light.
Derive an expression for the rms pulse broadening due to intermodal dispersion in step index multimode optical fiber.
Why is dispersion in graded index fiber less as compared to step index fiber Explain optimum near profile parameter.
4. Describe with the help of suitable _diagrams, the major strategies and structures utilized in the fabrication of injection laser.
Estimate the optical power coupled into a 50 m diameter step index fiber with a numerical aperture of 0·18 from a DH surface emitter with an emission area diameter of 75 m and a radiance of 60 Wsr^-1cm^-2. The Fresnel reflection at index matched semiconductor fiber interface may be considered negligible.
Draw and explain a neat diagram of surface emitter LED.
When 10^11 photons per second, each with an energy of 1·28 x 10^-19 are incident on an ideal photodiode,
calculate
the wavelength of the incident radiation, and
the output photocurrent.
Discuss various sources of noise in optical fibre communication.
7. Discuss the APD in detail with the help of a neat diagram and derive the expression for the SNR in an APD receiver.
8. Briefly describe what is meant by the following terms related to injection Laser:
Relaxation Oscillations
Threshold current dependence on temperature
9. Draw and explain the block diagram of an optical receiver.
10. Write short notes on any two of the following:
Step and Graded Index Fibers
Phototransistors and Photoconductors
Line Coding
With the help of a neat diagram, explain the block· diagram of an optical fiber communication system.
2. Explain what is meant by the critical bending radius for an optical fiber. A multimode graded index fiber has a core refractive index of 1·46 with the cladding refractive index of 1·45. The critical radius of curvature which allows large bending losses to occur is 84 JUD.. Determine the wavelength of the transmitted light.
Derive an expression for the rms pulse broadening due to intermodal dispersion in step index multimode optical fiber.
Why is dispersion in graded index fiber less as compared to step index fiber Explain optimum near profile parameter.
4. Describe with the help of suitable _diagrams, the major strategies and structures utilized in the fabrication of injection laser.
Estimate the optical power coupled into a 50 m diameter step index fiber with a numerical aperture of 0·18 from a DH surface emitter with an emission area diameter of 75 m and a radiance of 60 Wsr^-1cm^-2. The Fresnel reflection at index matched semiconductor fiber interface may be considered negligible.
Draw and explain a neat diagram of surface emitter LED.
When 10^11 photons per second, each with an energy of 1·28 x 10^-19 are incident on an ideal photodiode,
calculate
the wavelength of the incident radiation, and
the output photocurrent.
Discuss various sources of noise in optical fibre communication.
7. Discuss the APD in detail with the help of a neat diagram and derive the expression for the SNR in an APD receiver.
8. Briefly describe what is meant by the following terms related to injection Laser:
Relaxation Oscillations
Threshold current dependence on temperature
9. Draw and explain the block diagram of an optical receiver.
10. Write short notes on any two of the following:
Step and Graded Index Fibers
Phototransistors and Photoconductors
Line Coding
Other Question Papers
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Subjects
- Advance Microprocessor And Architecture
- Analog and Mixed Mode VLSI Design
- Analog Communication
- Analog Electronic Circuits
- Analog Integrated Circuits Design
- Antennas and Propagation
- B10-Informatics
- Basics Of Electronics Engineering
- Computer Architecture
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- Control Engineering
- Data Communication And Network
- Device Modelling For Circuit Simulation
- Digital Electronics
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- Electromagnetic Field Theory
- Electronic Measurement and Inst
- Electronic Switching Circuits
- Embedded System Design
- Information Theory And Coding
- Linear Integrated Circuits
- Microcontrollers
- Microprocessor And Its Applications
- Microwave And Radar Engineering
- Multirate Systems
- Optical Fiber Communication
- Power Electronics
- Satellite And Tv Engineering
- Signal And Systems
- Wireless Communication