Ece 522: Photonic Devices And Fibre Optic Communications Question Paper

Ece 522: Photonic Devices And Fibre Optic Communications

Course:Bachelor Of Engineering In Electrical And Computer Engineering

Institution: Moi University question papers

Exam Year:2008

ECE 522: PHOTONIC DEVICES AND FIBRE OPTIC COMMUNICATIONS

1. Briefly explain the meaning of each of the following terms as used in optical networks
i. Synchronous optical network (SONET) protocol
ii. Synchronous digital hierarchy (SDH) protocol
iii. Synchronous transport module level one (STM-1)
iv. Attenuation limit
v. Dispersion limit. (10mks)

2. Briefly describe the salient features of each of the following Laser diodes
i. Distributed Bragg Reflector (DBR) edge emitting laser diode.
ii. Distributed Feedback (DFB) edge emitting laser diode.
iii. Vertical cavity surface emitting diode (VCSEL) (10mks)

3.
a. A semiconductor Laser amplifier (SLA) is sometimes described as a Laser diode biased below threshold.
i. List two types of semiconductor optical amplifiers
ii. With the aid of simple sketches describe the principle of operation of the SLA. (6mks)

b. A fibre with an attenuation factor of 0.2 dB/km is used in a link where an Erbium Doped Fibre Amplifier (EDFA) is used to regenerate the signal after propagation for 50 km. What should be the gain of the EDFA required to maintain no-loss-no-gain regeneration?

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Ece 522: Photonic Devices And Fibre Optic Communications Question Paper

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