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Novel all-electrical scheme for dynamic semiconductor laser-to-fibre coupling control

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2 Author(s)
Andrekson, P.A. ; Chalmers University of Technology, Department of Electrical Measurements, Gothenburg, Sweden ; Alping, A.

An all-electrical scheme to maintain the optimum coupling condition in semiconductor laser-to-fibre coupling is described. A small deviation (¿¿) of the optimum laser-to-fibre distance severely degrades the laser performance in terms of, for example, output power, longitudinal mode spectrum and pulse response. The scheme employs the electrical noise of the laser as a distance sensor in a control loop that maintains the optimum laser-to-fibre distance in the presence of thermal or mechanical disturbances.

Published in:

Electronics Letters  (Volume:23 ,  Issue: 24 )