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Analysis of the Additional Modulation of Semiconductor Lasers Using Optical Heterodyne Techniques

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8 Author(s)

In this letter, the power spectrum of a cooled distributed feedback laser module is measured using the self-heterodyne technique. Periodical oscillation peaks have been observed in the measurement. Further investigation shows that the additional modulation signal is coupled from the thermal electric cooler (TEC) controller to the laser driver, and then applied to the laser diode. The additional modulation can be eliminated by properly isolating the laser driving source from the TEC controller.

Published in:

Photonics Technology Letters, IEEE  (Volume:20 ,  Issue: 2 )

Date of Publication:

Jan.15, 2008

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