Title :
Analysis of the Additional Modulation of Semiconductor Lasers Using Optical Heterodyne Techniques
Author :
Zhu, Ning Hua ; Zhang, Bang Hong ; Wen, Ji Min ; Li, Hao ; Li, Liang ; Chen, Wei ; Zhang, Yan ; Xie, Liang
Author_Institution :
CAS, Beijing
Abstract :
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.
Keywords :
controllers; distributed feedback lasers; heterodyne detection; laser feedback; optical modulation; semiconductor lasers; TEC controller; additional modulation; cooled distributed feedback laser module; laser diode; laser driver; optical heterodyne techniques; power spectrum; self heterodyne technique; semiconductor lasers; thermal electric cooler controller; Distributed feedback devices; Laser feedback; Optical control; Optical coupling; Optical feedback; Optical mixing; Optical modulation; Power lasers; Power measurement; Semiconductor lasers; Additional modulation; distributed feedback (DFB) laser; heterodyne technique; laser driver; thermal electric cooler (TEC) controller;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.912515
