Optoelectronics and Optical Communication

(a) Explain the function SONET frame structure. How these are different from SDH

(a) List the advantages of OCS over wireless?

(b) Calculate bandwidth required for a single telephone voice channel.

(a) Differentiate between Step index and graded index fibers. Explain with diagrams.

(b) Differentiate between inter modal, intra modal and PMD. How their effect is minimized? 

(a) Differentiate between LED and LASER action. Compare their features.

(b) Differentiate between APD and PIN diode operation. Explain.

(a) Explain the function of digital signal transmission over fibers. How these are detected at the receivers. 

(a) Differentiate between various network topologies. Explain with diagrams.

(b) Differentiate between SCM and TDM operation. Explain with examples.

(b) Draw schematic for OCS. How does it work? Explain function of each block .

(b) Differentiate between Optical transport network and Optical premise network. List their applications.

(a) How does communication through optical fiber work? Explain the steps.

(b) Write applications of dispersion shifted fibers? How these are fabricated?

(c) Write applications of Photo multiplier tubes? Give examples.

(a) How does SONET work? Calculate the bit rate for OC-3 standard.

 (e) Differentiate between consumer and  industrial  applications of  optoelectronics

Explain the following and differentiate the functions of :-

(a) DCF and Dispersion flattened fiber

Explain the following and differentiate the functions of :-

(b) Linear and nonlinear scattering

(a) Explain SONET/SDH in detail.

(a) Explain fiber optic communication with block diagram.

(b) A synmetric step-index planar waveguide is made of glass with n₁=1.5& n₂=1.49. The     thickness of the guided layer is 9.83  and the guide is excited by a source of   wavelength 0.85  . What is the range of the propagation constants? What is the   maximum number of modes supported by the guide?

(a) Explain mode theory for circular waveguides using equations.

(b) Explain various types of absorption and scattering losses.

(a) what are link power budget and rise time budget analyses?

(b) Discuss various industrial & consumer applications of optical fiber communication.

(a) A  p-n photodiode has a quantum efficiency of 70% for photons of energy 1.52 x 10^-19J. Calculate: (i) the wavelength at which the diode is operating and (ii) the optical power required to achieve a photocurrent of 3  using above calculated wavelength

(b) Explain different type of photodiodes in detail.

(a) What is polarization effect?

(b)Explain the term quantum efficiency.

(c)to what is the concept of probability of error.

(d) Explain working of an LED fed Discuss equilibrium numerical aperture.

(b) Discuss the concept of wave propagation in Step-Index & Graded-Index Fiber.

(9) Discuss construction of LASER & explain the term population inversion.

(b) Explain various optical network topologies with diagram.

(e) Discuss various multiplexing strategies in detail.

(b) Explain the structure of optical fiber cable with diagram.

Write short note on:

(a) Bending & Dispersion losses. 

(b) Fabrication & Mechanical properties of optical fiber.

(a) With the mode theory, differentiate between SMF, Multimode fibers and their

applications.