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Anna University Chennai
Department of B.E Electronics and Communication Engineering
Seventh Semester
EC2402 Optical Communication and Networking
November / December 2015 Exam Important Questions
(Regulation 2008)
IUQP Important Questions
Anna University, Chennai
Department of B.E-Electronics and Communication Engineering
B.E / B.TECH DEGREE EXAMINATION Nov Dec 2015
SEVENTH SEMESTER
EC2402 Optical Communication and Networking
(REGULATION 2008)
1. (i) Draw and explain my theory transmission in an optical communication. (8)
(ii) With diagram. Explain acceptance angle, numerical aperture arid total internal reflection (8)
2. Explain the features of multi-mode and single mode step index fiber and compose them.
3. (i) A Si fiber with silica core refractive index of 1.458, v = 75 and NA = 0.3 is to be operated at 82 nm. What should be its core size and cladding refractive index? Calculate the total number of modes entering this fiber. (8 marks)
(b) (ii) Derive expression for the linearly polarized modes in optical fibers and obtain the equation for V number
4 (i) Explain the phenomenon of total internal reflection using Snell's law with figures and calculations. (12)
(ii) Distinguish step-index from graded index fibers. (4)
5. (i) What is meant by ’fiber splicing’? Explain fusion splicing of optical fibers. (8)
(ii) Explain expanded beam fiber connector with a neat schematic.(8)
6. (i) Draw and explain the various fiber alignment and joint losses. (8 marks)
(ii) Write notes on fiber splices and connectors: (08 marks)
7. Describe the three types of fiber misalignment that contribute to insertion loss at an optical fiber joint. (16)
8. Explain the attenuation and losses in fibre. (16)
9. Draw and compare the construction and characteristics of PIN and Avalanche photo diode (16)
10. (i)What are the possible noise sources that contribute the photo detector noise? (8 marks)
(ii) What is meant by detector response time? Explain (8 marks)
11. (i) Explain the structure and working of a silicon APD. (12)
(ii) Define S/N ratio of a photodetector. What conditions should be met to achieve a high SNR? (4)
12. Draw and explain the structure of Fabry-Perot resonator cavity for a laser diode. Derive laser diode rate equations. (16 marks)
13. (i) With suitable diagram explain optical receiver operation and its performance (8 marks)
(ii) With diagrams explain the following: (4+4 marks)
a) Measurement of NA of a fiber.
b) Measurement of refractive index profile.
14. Write notes on the following
(i) Fiber refractive index profile measurement (8 marks)
(ii) Fiber cut off wavelength measurement (8 marks)
15. Explain the measurement technique used in the case of
(i) Numerical aperture
(ii) Refractive index profile
(iii) Fiber cut-off wave length
(iv) Fiber diameter. ( 4 + 4 + 4 + 4 = 16 marks )
16. Write short notes on
(i) Wavelength routed networks. (8)
(ii) Optical CDMA.
17. Discuss the concepts of Media Access Control protocols in Broadcast and select networks (16)
18. Draw the block diagram of OTDR .Explain the measurement of any two fiber optic measurement with this. (16 marks)
19. Outline the major categories of multiport fiber optic coupler (16)
20. Explain SONET layers and Frame Structure with diagram (16 marks)
Anna University Chennai
Department of B.E Electronics and Communication Engineering
Seventh Semester
November / December 2015 Exam Important Questions
(Regulation 2008)
IUQP Important Questions
Anna University, Chennai
Department of B.E-Electronics and Communication Engineering
B.E / B.TECH DEGREE EXAMINATION Nov Dec 2015
SEVENTH SEMESTER
EC2402 Optical Communication and Networking
(REGULATION 2008)
1. (i) Draw and explain my theory transmission in an optical communication. (8)
(ii) With diagram. Explain acceptance angle, numerical aperture arid total internal reflection (8)
2. Explain the features of multi-mode and single mode step index fiber and compose them.
3. (i) A Si fiber with silica core refractive index of 1.458, v = 75 and NA = 0.3 is to be operated at 82 nm. What should be its core size and cladding refractive index? Calculate the total number of modes entering this fiber. (8 marks)
(b) (ii) Derive expression for the linearly polarized modes in optical fibers and obtain the equation for V number
4 (i) Explain the phenomenon of total internal reflection using Snell's law with figures and calculations. (12)
(ii) Distinguish step-index from graded index fibers. (4)
5. (i) What is meant by ’fiber splicing’? Explain fusion splicing of optical fibers. (8)
(ii) Explain expanded beam fiber connector with a neat schematic.(8)
6. (i) Draw and explain the various fiber alignment and joint losses. (8 marks)
(ii) Write notes on fiber splices and connectors: (08 marks)
7. Describe the three types of fiber misalignment that contribute to insertion loss at an optical fiber joint. (16)
8. Explain the attenuation and losses in fibre. (16)
9. Draw and compare the construction and characteristics of PIN and Avalanche photo diode (16)
10. (i)What are the possible noise sources that contribute the photo detector noise? (8 marks)
(ii) What is meant by detector response time? Explain (8 marks)
11. (i) Explain the structure and working of a silicon APD. (12)
(ii) Define S/N ratio of a photodetector. What conditions should be met to achieve a high SNR? (4)
12. Draw and explain the structure of Fabry-Perot resonator cavity for a laser diode. Derive laser diode rate equations. (16 marks)
13. (i) With suitable diagram explain optical receiver operation and its performance (8 marks)
(ii) With diagrams explain the following: (4+4 marks)
a) Measurement of NA of a fiber.
b) Measurement of refractive index profile.
14. Write notes on the following
(i) Fiber refractive index profile measurement (8 marks)
(ii) Fiber cut off wavelength measurement (8 marks)
15. Explain the measurement technique used in the case of
(i) Numerical aperture
(ii) Refractive index profile
(iii) Fiber cut-off wave length
(iv) Fiber diameter. ( 4 + 4 + 4 + 4 = 16 marks )
16. Write short notes on
(i) Wavelength routed networks. (8)
(ii) Optical CDMA.
17. Discuss the concepts of Media Access Control protocols in Broadcast and select networks (16)
18. Draw the block diagram of OTDR .Explain the measurement of any two fiber optic measurement with this. (16 marks)
19. Outline the major categories of multiport fiber optic coupler (16)
20. Explain SONET layers and Frame Structure with diagram (16 marks)
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