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Lecture note - 34129 Experimental Course in Optical Communication - July 2006
Direct and external modulation of light.
34129 Experimental Course in Optical Communication.

C. Peucheret


This note is intended as an introduction to the laboratory exercise on direct and external modulation in the course 34129 Experimental Course in Optical Communication. The concepts of direct and external modulation are introduced and general requirements on the properties of the generated signals, such as extinction ratio and frequency chirp, are briefly discussed. The principles and main features of external modulation mechanisms in electro-absorption and electro-optic modulators, as well as direct current modulation of semiconductor laser diodes are outlined. Finally the assignments of the exercise itself are presented. The focus is on the static and dynamic characterisations of a directly modulated laser operating at 10 Gbit/s, as well as on comparison with external chirp-free modulation after propagation through a length of standard single-mode fibre.


34129_2006_DML_EML_Exercise.pdf (available for everyone)

Record created 2007-07-04, last modified 2008-10-15

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