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

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...

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Veröffentlicht in:	IEEE photonics technology letters 2008-01, Vol.20 (2), p.138-140
Hauptverfasser:	Zhu, Ning Hua, Zhang, Bang Hong, Wen, Ji Min, Li, Hao, Li, Liang, Chen, Wei, Zhang, Yan, Xie, Liang
Format:	Artikel
Sprache:	eng
Schlagworte:	Additional modulation distributed feedback (DFB) laser Distributed feedback devices Distributed feedback lasers Drivers Electric power generation heterodyne technique Laser diodes laser driver Laser feedback Lasers Modulation Optical control Optical coupling Optical feedback Optical mixing Optical modulation Oscillations Power lasers Power measurement Semiconductor lasers thermal electric cooler (TEC) controller
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Beschreibung
Zusammenfassung:	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.
ISSN:	1041-1135 1941-0174
DOI:	10.1109/LPT.2007.912515