Explain the characteristics of EDFA. Discuss a scheme for both C band and L band amplification

using EDFA
(9 Marks)

(a) Explain the operation of Semiconductor Optical Amplifier

(b) Show that an ideal optical amplifier has a noise figure Of 308.
(5+4=9 Marks)

Part. C

(a) Briefly explain how solitons maintain their pulse shape in presence of dispersion and fiber

losses.

(b) Explain how soliton collisions limit the number of channels in a WDM soliton
system.
(7+5=12 Marks)

Draw the block schematic of a synchronous coherent optical receiver and explain. Show how
an electro optic material such as (11003 can be used for different modulation schemes in
coherent optical systems.

(6+6=12 Marks)

(a) Calculate the sensitivity of a homodyne PSK receiver operating atl : 55gm in the
shot noise limit. Assume that = 0 : gand Af = IGHz.
(b) Write short notes on tunable optical filters and AWG.

(6+6=12 Marks)