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VTU Electronics and Communication Engineering (Semester 7)
Optical Fiber Communication
December 2013
Optical Fiber Communication
December 2013
1 (a)
Describe block diagram of an optical fiber transmission link and explain the function of each elements in link.
8 M
1 (b)
Explain what is ment by graded index optical using simple ray theroy concept indicate the major advantages of this type of fiber with regards to multimode propagation
6 M
1 (c)
A grade index fiber with parabolic refractive index has n1=1.48 and n2=1.46 if core radius is 20?m.Find the number of modes at 1300nm and 1550nm
6 M
2 (a)
Describe rayleigh Scrtering in optical fiber
6 M
2 (b)
Briefly explain intramodal and intermodel dispersion
6 M
2 (c)
Glass fiber exhibits material dispersion given by,\[ \lambda^2\left ( \frac{d^2n_1}{d\lambda_2} \right ) \] of 0.025.Determine material dispersion parameter at a wavelength of 0.85?m and estimate rms pulse broading /km for good LED source with an rms spectral width of 20nm at this wavelength.
8 M
3 (a)
sketch and explain fabry perot resonator cavity of laser
7 M
3 (b)
Discuss the operation of silicon RAPD with near neat diagram
7 M
3 (c)
Consider a photodiode with quantum efficiency 75% when photon of energy 1.6*10-19j, are incident on the surface then calculate opertaing wavelenghth and if 2.6?A.photo current through detector corresponding,determine incident optical power when detector is operated at ssme wavelenghth
6 M
4 (a)
Describe with aid of suitaible diagram,three common techniques used for mechanical splicing of optical fibers
6 M
4 (b)
with aid of simple sketches ourline major categories of fiber couplers
6 M
4 (c)
A GaAs optical source that has a refractive index of 3.6 is closely coupled to step index fiber which has a core refractive index of 1.465 if the sources size is smaller than fiber core,and small gap between source and fiber is filled with a get that has a refractive index of 1.305 what is the power loss in describe from source into fiber?
8 M
5 (a)
Briefly discuss the possible soureces of noise in optical fiber receivers
6 M
5 (b)
discuss how the eye diagram is powerful measurement for assign the data handling capability in digiatal transmission system
8 M
5 (c)
Write a note on analog receivers
6 M
6 (a)
Explain the multi AM techniques employed in broadband analog application.
8 M
6 (b)
Explain :
microwave photonics
RF over fiber.
microwave photonics
RF over fiber.
6 M
6 (c)
Explain in brief:
short wavelength band
chirping
short wavelength band
chirping
6 M
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